Nabble - jikesrvm-announce

[rvm-announce] Jikes RVM Project Changes

2009-08-16T19:12:37Z

Dear Jikes RVM Researchers, We are writing to introduce two new members to the Jikes RVM Steering Committee, announce some changes to the project organization, and highlight our performance results, which are now competitive with the products on the DaCapo Benchmarks. Steering Committee ~~~~~~~~~~~~~~~~ We have invited Richard Jones (U. Kent) and Kathryn McKinley (U. Texas) to join us on the Steering Committee. Both Kathryn and Richard have accepted our invitation. Kathryn and Richard been involved with the project since its inception. They both have a long track record of engagement with the project; directly and through the activities of their respective research groups. Their addition to the committee reflects our view that our stakeholders are researchers and that our mission is enabling research. Project Organization ~~~~~~~~~~~~~~~~ We have also made a minor change to the project structure, replacing the term "Core Team" with "Jikes RVM Team". We also extend team membership to anyone who has demonstrated a substantial commitment to the project through concrete contributions. Such contributions are not limited to code, but may include substantive contributions to the health of the project in any form. These changes are intended to emphasize the importance of researchers as the primary stakeholders in this project, and to make it explicit that the importance of a member's input is not measured in terms of the quantity or quality of changes to the code base. We will also now encourage team members to follow a "12 month rule", whereby they are asked to reassess their team membership after a period of 12 months of inactivity Performance ~~~~~~~~~~ Due to the efforts of the Jikes RVM Team in adding features (such as native threads, Immix GC, and biased locking), and tuning the adaptive system, we have recently achieved really excellent performance results. While Jikes RVM still lags behind the products on the SPEC benchmarks (the products are highly tuned for SPEC), Jikes RVM attains within 5% of their performance on the DaCapo Benchmarks. Results are available here:http://jikesrvm.anu.edu.au/performance/2009-07/These performance gains make Jikes RVM an even more appealing research platform and offer more evidence that Java can be an effective system implementation language. :-) We hope that these changes will bring new life to the project and re-affirm the project's original objectives of supporting the research community. Kathryn, Richard and the rest of the Jikes RVM Steering Committee welcome comments, suggestions and feedback from our community. David Grove Steve Blackburn Mike Hind

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[rvm-announce] Jikes RVM 3.1.0 released

2009-06-10T08:19:52Z

Jikes RVM version 3.1.0 has been released and is available for download at http://downloads.sourceforge.net/jikesrvm/jikesrvm-3.1.0.tar.bz2

It's been almost nine months since the release of Jikes RVM 3.0.1, and quite a bit has changed in Jikes RVM. We'd like to call out several items that may be of particular interest to the community.
1. Jikes RVM has switched to using native threading instead of m-to-n (aka green) threading.
2. The default mature space collector has changed from Mark-Sweep to Immix.
3. Jikes RVM is now licensed under the Eclipse Public License (EPL).
4. The 3.1 release significantly improves over the performance of 3.0.1, with speedups of 10% and 21% on average for DaCapo and SPEC benchmarks respectively on an Intel C2Q. Highlights include a 29% improvement in jbb and a 32% improvement in jython.

Details are given below, or are browsable online in our JIRA instance at http://jira.codehaus.org/browse/RVM/fixforversion/14620.

New Feature
* RVM-641 - Make Immix the default mature space collector
* RVM-682 - Assertion checking in sysMalloc
* RVM-802 - Debugging hooks in MMTk
* RVM-806 - Heavyweight sanity checker for MMTk Harness
* RVM-807 - Simple type system for MMTk Harness scripting language

Bug
* RVM-460 - Not accounting for nursery promotion AND defrag in GenImmix
* RVM-498 - ppc-linux32 dying on SPEC jbb 2005 with 4 threads
* RVM-613 - asking if a method has a hasBaselineSaveLSRegistersAnnotation triggers classloading (and thus GC) when GC is disabled during OSR
* RVM-625 - FullAdaptiveImmix and FullAdaptiveStickyImmix broken on ppc32-linux
* RVM-638 - Crash in Poisoned configs on PPC (aix/linux, 32/64) apparently relating to clone
* RVM-662 - Error growing discontiguous space
* RVM-664 - Occasional digest validation errors on lusearch performance runs
* RVM-683 - Fix race in AOS controller/organizer synchronication during startup
* RVM-690 - Class loader and reflection problems for unboxed types
* RVM-696 - Don't recomend copying project contents with eclipse-project
* RVM-698 - Don't clear most significant bits for <32bit return types on Intel breaks Ubuntu 8.10
* RVM-700 - Not running class initializer for InetAddress causing ServerSocket failures
* RVM-701 - Edge Counter and Dynamic Call Graph output after run fails
* RVM-703 - Throwable.getStackTrace() implementation is incorrect
* RVM-704 - Regressions from 2.9.1 not allowing jetty web server to run
* RVM-708 - Bad reference map created by IA32 baseline compiler
* RVM-712 - Uninterruptible code should not be allowed to call UnpremptibleNoWarn methods
* RVM-722 - Bug in Static Spliting induces unconditional OSR invalidations when running _228_jack in measure compilation mode
* RVM-729 - enabling simple_escape_ipa causes a ClassCastException
* RVM-732 - Exception in thread "MainThread" java.security.AccessControlException: permission (java.lang.RuntimePermission exitVM) not granted: no protection domains
* RVM-733 - rvm crash when closing a file in ExitMonitor.notifyExit(int value)
* RVM-738 - Fix debugging output when extracting long variable values for OSR
* RVM-743 - compress-3GC fails with OOME
* RVM-744 - Terminal not in grammar: read_ceiling (BURS)
* RVM-748 - Bug in type checking when > 32767 types
* RVM-756 - Intel unnecessarily restricts boot image to be at addresses > 0x30000000
* RVM-774 - Incorrect implementation of static initializers in the case of initializers that throw exceptions
* RVM-795 - Baseline GC Maps with JSRs fails to set reference flag for aload operations
* RVM-800 - In TemplateCompilerFramework.genCode, case JBC_anewarray, I don't believe that the array resolution and instantiation path is ever taken
* RVM-808 - OutOfMemoryError when allocating a 200 MB tab
* RVM-811 - Immix: "Chunk map overflow" on jbb2005 ppc64-linux
* RVM-814 - Wrong exception from Java reflection
* RVM-828 - Do not search superclasses for a method unless no method is found.

Improvement
* RVM-91 - Modularize threading system (native thread support)
* RVM-283 - Increase frequency of timer-based method sampling
* RVM-362 - Sort accumulating operands on to LHS of commutative operations
* RVM-462 - Immix code still contains huge number of experimental variables
* RVM-532 - Harmony's OSMemory implementation uses JNI
* RVM-612 - Assertion checking on stack height in baseline compiler
* RVM-689 - Update MMTk tutorial
* RVM-709 - Document meaning of constants in build reference maps
* RVM-725 - Increase command line options for tuning opt compiler behaviour
* RVM-736 - Disable ImmutableEntryHashSetRVM.remove()
* RVM-737 - Support local variable table for methods
* RVM-739 - Made org.jikesrvm.compilers.opt.util.Pair generic and moved it to package org.jikesrvm.util
* RVM-740 - Support for floating point conditional moves on Intel with SSE
* RVM-741 - Support for negation and abs() using SSE2 bit masks
* RVM-775 - Cleanup up code that obtains targets of pseudo_invokestatic instruction
* RVM-791 - Clean up and modularize locking
* RVM-801 - Minor change: Reorganize ClassFileReader by moving code for reading in the constant pool into a separate function
* RVM-803 - Use for-each loop in RVMClass wherever possible

Tasks and Sub-tasks
* RVM-817 - Change Jikes RVM license from Common Public License to Eclipse Public License
* RVM-685 - Implement x86 64 JNI Compiler
* RVM-751 - Implement PowerPC syscalls
* RVM-759 - Stack maps seem to be broken
* RVM-779 - Update userguide to decribe native threads
* RVM-783 - Fix baseline Intel 64bit reference maps
* RVM-786 - Adjust sampling mechanism in AOS to account for native threads
* RVM-787 - Outline exception raising code in gnu.java.lang.CPStringBuilder to enable better inlining
* RVM-29 - Track website traffic via sourceforge logo requests

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[rvm-announce] Jikes RVM 3.0.1 released

2008-10-16T10:19:40Z

Jikes RVM version 3.0.1 has been released and is available for download at http://downloads.sourceforge.net/jikesrvm/jikesrvm-3.0.1.tar.bz2

The detailed release notes for major changes since 3.0.0 can be found below or in JIRA (http://jira.codehaus.org/browse/RVM/fixforversion/14378).

** New Feature
* [RVM-507] - Initial prototype of TuningFork trace generation in Jikes RVM
* [RVM-515] - Make boot image writer traversal of object graph configurable
* [RVM-517] - Reflection optimization
* [RVM-528] - Support for eclipse-project with Harmony class libraries
* [RVM-634] - Add RuntimePure annotation to indicate when a Pure annotation should only be respected at runtime
* [RVM-673] - Implement Inline.When.AssertionsDisabled pragma

** Improvement
* [RVM-291] - Immortal objects with address based hashing should set their hashed bit during boot image writing
* [RVM-443] - Avoid back references in java.lang.reflect VMXXX classes
* [RVM-476] - Make lock allocation thread-model-agnostic.
* [RVM-627] - Use java.nio for writing boot image
* [RVM-632] - Space improvements of RVMClass.objectCache
* [RVM-633] - Avoid the use of Reflection to invoke Object.finalize()
* [RVM-644] - Reduce copying of char[] in java.lang.reflect.Proxy
* [RVM-650] - Ask users to submit bug reports on Jikes RVM crashes

** Bug
* [RVM-172] - Failing DaCapo benchmarks on PPC 32 OS X
* [RVM-288] - Assertion failure in inline oracle
* [RVM-318] - java.util.Scanner is unimplemented
* [RVM-346] - SPECjvm98: Invalid runs should not be SUCCESSes
* [RVM-410] - Problem with changes to stack walk
* [RVM-440] - Poisoned tests failing in finalizer thread
* [RVM-471] - Stack frame alignment broken for Intel on OS/X
* [RVM-605] - Possible fix for FreeListPageResource.releasePages()
* [RVM-606] - Problems with OSR guarded inlining of invokeinterface
* [RVM-614] - BaseBasePoisoned build segfaults during VM bootup on pcc64-linux
* [RVM-617] - DaCapo bloat fails with Apache Harmony class library
* [RVM-619] - DaCapo eclipse fails with Apache Harmony class library
* [RVM-621] - DaCapo xalan fails with Apache Harmony class library
* [RVM-623] - Intel 16bit operations with immediate operands in some cases generate 32bit immediate operands rather than 16bit
* [RVM-631] - Bug in new Finalization code
* [RVM-636] - Crash in reflection during JSR-166 TCK
* [RVM-643] - Invalid InstructionFormat usage in Simplifier, but real bug is that IR is semantically malformed
* [RVM-645] - Bug in LiveAnalysis related to modeling of dataflow through Exception edges in the FCFG
* [RVM-646] - Immix defrag broken
* [RVM-652] - build failure on IA32 OS X 10.5 (Leopard)

** Tasks and Sub-task
* [RVM-651] - Add support to Intel assembler for REX prefix byte
* [RVM-667] - Modify the implementation of table switch
* [RVM-669] - Build/boot image runner support for x86 64
* [RVM-671] - Fix spill location size estimates
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[rvm-announce] Jikes RVM 3.0.0 released

2008-08-07T07:42:43Z

We're very happy to announce the release of Jikes RVM version 3.0.0.

The road towards 3.0 began just about two years ago and a large number of
people, both on the core team and from our user community at large, have
contributed to making it a success. Thank You!

The release is available for download at
http://downloads.sourceforge.net/jikesrvm/jikesrvm-3.0.0.tar.bz2

The detailed release notes for major changes since 2.9.3 can be found below
or in JIRA (http://jira.codehaus.org/browse/RVM/fixforversion/13530),
but we'd like to highlight some of the larger themes that went into the 3.0
release (many of which have already been released in the 2.9.x releases
we've made along the way).
** Normalization of source code and build process
*** Complete rewrite of the build/test systems to use ant.
*** Jikes RVM can be developed in Eclipse using the JDT
*** Extensive restructuring of package structure
*** Removal of VM_ and OPT_ prefixes from all source files.
** Increased system stability and performance
*** A new continuous testing system
(http://jikesrvm.anu.edu.au/cattrack)
*** Concerted stability and performance drives
** Java 5 support
*** Support for Java 5 language features
*** Use of Java 5 language features throughout the code base.

Detailed list (89 issues closed in the 3 months since 2.9.3)

** New Feature
* [RVM-358] - Initial support for Apache Harmony class library
* [RVM-480] - Spec JVM 2008 regression test
* [RVM-534] - MMTk Test harness
* [RVM-540] - Implement java.lang.Compiler
* [RVM-591] - Support for jdocs.com javadoc
* [RVM-592] - Checks on creating ObjectReferences

** Improvement]
* [RVM-72] - NonMoving annotations for classes instances of which
should be allocated to the immortal heap
* [RVM-273] - Remove VM_ prefix from all VM classes
* [RVM-275] - Remove VMOpt prefix from opt compiler classes that go
into bootimage
* [RVM-282] - Make dumpVirtualMachine more defensive
* [RVM-329] - Specialize IA32 assembler for lister vs. non-lister
* [RVM-333] - Annotations used for VM Pragmas (NoInline,
Uninterruptible, etc) probably should not be as closed linked to
classloaders
* [RVM-445] - Clean up handling of JTOC
* [RVM-449] - Handle instanceof and checkcast in ShortArray scalar
replacer
* [RVM-477] - Gather new compiler DNA
* [RVM-501] - BuildWithAllClasses is (practically) unused
* [RVM-502] - Dead code elimination of pure calls)
* [RVM-505] - Eliminate calls to VM_Class.getClass..FromStackFrame when
stack frame is determinable
* [RVM-508] - Have hash map where entries are completely immutable
saving references from boot image root set
* [RVM-510] - Create top level common directory to make it easier to
split out and share useful components from rvm and MMTk
* [RVM-511] - Split out MMTk option processing support
* [RVM-512] - Experiment with freezing bucket array in
VM_HashMap/VM_HashSet
* [RVM-513] - Large arrays in boot image cause memory leak
* [RVM-525] - Upgrade to GNU classpath 0.97.2
* [RVM-537] - Implement inline mustImplementInterface sequence for
invokeinterface in baseline compilers
* [RVM-538] - Inline checkcast/instanceof sequences in baseline
compiler for simple cases
* [RVM-572] - Remove OSR_ and BC_ prefixes from OnStackReplacement code
* [RVM-593] - Extra checks on references being traced in rvm
* [RVM-603] - Improve intel baseline prologue/epilogue/call by use
push/pop instead of mov [sp]
* [RVM-594] - Naming of MM_Interface

** Bug
* [RVM-46] - CaffieneMark failures on AIX/PPC
* [RVM-47] - DaCapo regressions on AIX/PPC
* [RVM-58] - Linker errors under AIX/ppc
* [RVM-105] - sysNetSelect doesnt seem to be avoiding the syswrap
select
* [RVM-187] - VM_OptGenericMapIterator: findGCMapIndex failed
* [RVM-221] - Specialized scanning broken on ppc64-aix?
* [RVM-234] - Annotation issues: not implemented via proxy classes,
support for serialization
* [RVM-269] - unresolved invokeinterface on <null> should force
classloading before rasiing NPE
* [RVM-271] - Timeouts for stress are not correct>
* [RVM-303] - Cannot modify accessible final instance fields
* [RVM-325] - Spec JVM 98 jack failing with OOMs
* [RVM-327] - Performance degredation in IA32 assembler
* [RVM-332] - Eclipse 3.2 fails to run on the RVM
* [RVM-369] - PPC32-OSX - Crash in GC when a stack contains native
frames
* [RVM-372] - Integer overflow in sysNanoTime
* [RVM-423] - Fop performance strangeness
* [RVM-442] - All poisoned tests fail PPC 32
* [RVM-454] - The sub-test TestAnnotationInheritance of the basic tests
is excluded until it can be fixed
* [RVM-458] - Poisoned bit test highlights JNI problem
* [RVM-469] - Fix IA32 assembler to use Address instead of Offset for
absolute addressing
* [RVM-482] - Crash when running Production_Opt0_perf portion of
compiler-dna test run
* [RVM-483] - Conditionalize fsqrt generation on PowerPC
* [RVM-492] - Dumping empty stack kills VM
* [RVM-493] - VM_Annotation.readValue doesn't use the correct
classloader
* [RVM-494] - Conversion between type descriptors, class names, and
file names in VM_Atom behaves inconsistently
* [RVM-495] - Crash during first major GC on PPC64 tests when running
with -X:processors=2
* [RVM-497] - New scan boot image assertion failing poisoned tests
* [RVM-499] - Overflowing JTOC during DaCapo eclipse run on PPC64 AIX
* [RVM-500] - No such field error: TreeMap$SubMap.minKey
* [RVM-504] - Increase time out on DaCapo eclipse for rvmppclnx64
* [RVM-506] - The field last in VM_HashMap and VM_HashSet is only ever
set to null
* [RVM-514] - Pure on mathMagic breaks dacapo sunflow
* [RVM-521] - Freshly checked out r14346 fails to build with an
uninterruptible violation
* [RVM-526] - GNU Classpath build: paths too long in check_jni.sh
* [RVM-527] - Harmony doesn't build 32bit libraries as necessary for
x86_64 build
* [RVM-529] - Implement reflection API for Harmony
* [RVM-531] - Boot image stack size too small
* [RVM-541] - gc stress failures
* [RVM-542] - Incorrect encoding of inner class native method names
* [RVM-543] - Invoking JNI_OnLoad of unrelated libraries when loading a
library with no JNI_OnLoad
* [RVM-544] - Class argument in NewObject ignored
* [RVM-547] - Building the boot image with the opt compiler and Harmony
fails
* [RVM-550] - Implementation of isZero magic in PPC baseline compiler
can overflow expression stack and corrupt stack frame
* [RVM-571] - BigDecimal Pure annotations causes crash on SPECjbb2005
for FullAdaptiveMarkSweep
* [RVM-582] - Fix all javadoc "syntax" errors
* [RVM-583] - Incorrect rounding on simplified integer divide
* [RVM-585] - RVM Identity HashMap doesn't use identity hashCode.. only
identity.equals
* [RVM-587] - IdentityHashMaps in the bootimage
* [RVM-588] - Assertion failure in BC2IR for primitive array load.
* [RVM-597] - Array index out of bounds in BC2IR generation context
* [RVM-598] - Increase use of unpreemptible
* [RVM-599] - New poisoned test failures on x86
* [RVM-608] - Object replacement ignores finalizer methods

** Task and Sub-Task
* [RVM-37] - Doccument the command line options
* [RVM-42] - Build/Test infrastructiure to compute compiler DNA
* [RVM-490] - Null Pointer Exception in
gnu.xml.transform.ParameterNode.clone
* [RVM-518] - Change build logic so that the VM prefix on a class name
does not control inclusion in the bootimage
* [RVM-519] - Rename classes currently with VM_ prefix that will be
confusing without it
* [RVM-520] - Update userguide to remove VM_ (and OPT_) prefix
globally.

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[rvm-announce] Jikes RVM 2.9.3 released

2008-05-10T18:07:10Z

We're very proud to announce that Jikes RVM version 2.9.3 is now available
for download! It's been a little bit longer than usual since the last
release and there's been quite a bit of activity on the project and
improvements to the system. The appended release notes capture many of the
highlights; for more details see the hyperlinked version in JIRA (
http://jira.codehaus.org/browse/RVM/fixforversion/13726).

The release is available at
http://downloads.sourceforge.net/jikesrvm/jikesrvm-2.9.3.tar.bz2..

** Bug
* [RVM-196] - VM_Processor not assignable with VM_GreenScheduler
* [RVM-314] - Support for Java 1.4 assertions
* [RVM-315] - java.lang.Method.invoke changes the parameters
* [RVM-316] - A Null pointer for the UTF8CHARSET in
java.util.zip.ZipFile$PartialInputStream
* [RVM-326] - Failing basic tests don't signal failure
* [RVM-330] - Thread.sleep() does not handle interrupts correctly
* [RVM-339] - Image bloat (code +25% & data +5%)
* [RVM-340] - Annotations don't handle arrays of primitive types
correctly
* [RVM-342] - NPE with advice files
* [RVM-347] - PPC 64 regressions and Intel stress regressions since the
introduction of read barriers
* [RVM-351] - Javac regression
* [RVM-352] - Running many iterations of _200_check fails floating
point remainder test
* [RVM-353] - Production Opt 0 builds broken
* [RVM-355] - Complete SPEC JVM with 20 iterations dies in GC
* [RVM-357] - Fatal error when synchronising on null objects
* [RVM-365] - PPC (AIX) Stack Scanning Appears Broken
* [RVM-368] - Compiler confusion over equal but non-identical objects
* [RVM-374] - Static field allocation is non-deterministic
* [RVM-380] - We create a lot (15909) optimization plan atomic elements
using 572724bytes in the boot image
* [RVM-383] - Branch likely and unlikely prefixes show up as LOCK
prefixes in x86 disassembler output
* [RVM-394] - Tune inlining of arraycopy
* [RVM-412] - Latent branch optimization bug when maximizing blocks
* [RVM-424] - Multianewarray confusion in opt compiler
* [RVM-439] - OSR triggering code misuses suspend/resume
* [RVM-447] - Inline size estimation reduction factor calculation over
rates precise information causing bloat and slow down
* [RVM-452] - Off-by-one error in "VMField.checkReadAccess" and
"VM.checkWriteAccess"
* [RVM-456] - Clean build broken
* [RVM-464] - Opt compiler ldc_w for class literal broken
* [RVM-466] - Four tests in test run "tiny" fail when compiled with
-X:aos:initial_compiler=opt -X:aos:enable_recompilation=false
* [RVM-467] - BURS performing illegal reordering to before PEI
* [RVM-468] - Instanceof test differs in opt compiler from baseline for
instanceof/checkcast of magic[][]
* [RVM-478] - Redesign AIX native method Linkage conventions to protect
CMID field from being smashed by native code saved CR

** Improvement
* [RVM-81] - Annotations in java.lang classes
* [RVM-195] - Enable inlining of @Pure methods
* [RVM-274] - Remove OPT_ prefix from all opt compiler classes
* [RVM-276] - opt compiler package structure
* [RVM-304] - Improve performance of chacter encoder when encoding to
and from arrays
* [RVM-305] - Add final annotations to java.io.OutputStreamWriter
* [RVM-308] - Greater use of StringBuilder rather than StringBuffer
* [RVM-309] - Greater use of "<Number>.valueOf" rather than "new
<Number>"
* [RVM-310] - Class library fields that could be final aren't final
* [RVM-311] - String toUpperCase and toLowerCase perform a
String.equals to see if the Locale is Turkey per invocation
* [RVM-322] - Intel assembler register naming improvement required
* [RVM-331] - Implement support for MMX registers
* [RVM-343] - Support for hardware SQRT instruction
* [RVM-344] - Simplifier rule for square root operator
* [RVM-378] - Avoid replicating field and method vectors
* [RVM-379] - Don't replicate OSR_EncodedOSRMaps
* [RVM-381] - Upgrade to Classpath 0.97
* [RVM-385] - Refactor reflection to use VM interface
* [RVM-387] - Baseline compiler emits RegDisp instructions when the
Disp is 0
* [RVM-390] - VM_Statics/JTOC space saving has cost us single iteration
fop performance
* [RVM-391] - Assign CPU # to each VM_Processor to have more
predictable performance results.
* [RVM-392] - Improvements to ZipEntry
* [RVM-395] - Local common sub-expression elimination of Pure method
calls
* [RVM-408] - Simple elimination of stack traces
* [RVM-417] - Switch performance runs to using a profiled image
* [RVM-421] - Pre-allocate 1 set of exception registers for athrow
* [RVM-422] - Update to latest Classpath j.u.c.CopyOnWriteArrayList
* [RVM-431] - Fix processor JNI entry/collector rendezvous race
* [RVM-433] - Increase final fields in java.nio
* [RVM-435] - Don't allocate memory when converting C buffers to
Strings or Classes
* [RVM-437] - Integer.toString doesn't keep cache of common values
* [RVM-451] - Structure of code in GNU Classpath java.util.Vector and
java.util.Arraylist interacts poorly with inlining

** New Feature
* [RVM-210] - Add Image sizes tracking to Regression report and mailout
* [RVM-319] - Create X10 test harness
* [RVM-406] - Add Immix garbage collector
* [RVM-441] - Sticky mark bits collector
* [RVM-457] - Immix Garbage Collectors
* [RVM-266] - Provide preliminary support for a non-copying
unsynchronised StringBuffer implementation

** Task and Sub-task
* [RVM-425] - Implement 2d array helper for PPC baseline
* [RVM-224] - Push OSR-specific fields in VM_NormalMethod to
subclass/side data structure
* [RVM-450] - Prevent compilation at max opt level before some dynamic
call graph information has been gathered
* [RVM-453] - Testing framework missing failures in basic tests that
use diff for sanity.

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[rvm-announce] Jikes RVM 2.9.2 Released

2007-10-20T19:03:08Z

We're very proud to announce that Jikes RVM version 2.9.2 is now available for download. As you can see from the appended release notes, there's been quite a bit of activity on the project since 2.9.1!

The release is available at http://downloads.sourceforge.net/jikesrvm/jikesrvm-2.9.2.tar.bz2.

New Features

* [RVM-121] - Separate code space for dynamically generated code
* [RVM-231] - Alignment checking (for IA32 and debugging purposes only)

Improvements

* [RVM-16] - Constant folding values from TIBs produces failures
* [RVM-27] - float/double to int/long conversions are overly expensive
* [RVM-51] - Switch from pthread hijacking back to portable native sync for gtk AWT threading
* [RVM-54] - Switch to Claspath's java.lang.Thread
* [RVM-64] - Flexible thread model
* [RVM-82] - Exceptions in Uninterruptible code should result in immediate fatal errors
* [RVM-94] - Enable SSE C/C++ compiler flags
* [RVM-164] - Use clock_gettime to implement sysNanoTime
* [RVM-179] - Move java/lang/String out of libraryInterface and into a patch against Classpath
* [RVM-185] - Reduce cost of ThreadLocal(s) to improve Jython performance
* [RVM-189] - Use will never move information from MM_Interface when generating constant operands
* [RVM-191] - Improve inline size estimator in VM_NormalMethod to account for getstatic of final primitive fields being folded by opt compiler
* [RVM-218] - Use VM_Magic.pause in spinwait loops
* [RVM-285] - Switch AOS call graph profiling to use CBS framework from Arnold & Grove 2005

Bug Fixes

* [RVM-55] - A thread that is interrupted prior to being scheduled won't interrupt
* [RVM-62] - Interrupted exceptions are generated in the caller of Thread.interrupt instead of by the thread throwing the interrupted exception
* [RVM-63] - Unsafe.park time values are incorrectly scaled
* [RVM-87] - NPE in ScanThread.setUpFrame:360
* [RVM-99] - MeasureCompilation reporting broken in production/development builds on ia32-linux
* [RVM-104] - eclipse occasionally fails with segmentation fault
* [RVM-109] - Restore documentation to org.vmmagic.pragma.*
* [RVM-112] - Verification error when building Jikes RVM 2.9.1 using HotSpot as host JVM.
* [RVM-113] - MarkCompactLocal.compact():80 assertion failure
* [RVM-114] - Ensure time is positive in test results
* [RVM-125] - Waiting on a lock that should raise illegal monitor state exception will actual fail on an assert
* [RVM-129] - GCTrace fails with "Cannot understand directive!"
* [RVM-131] - Collection.joinCollection() called when thread switching disabled
* [RVM-133] - Increase the amount of memory used during nightly tests
* [RVM-140] - Conflicting virtual address request for space "trace" on ppc32-linux
* [RVM-141] - SharedDeque assertion failure during exit for GCTrace
* [RVM-143] - VM_BuildBB.determineTheBasicBlock may not be correct for goto_w operation
* [RVM-144] - JikesRVM can't load certain classes e.g. GNU Classpath examples or its own Ant tasks
* [RVM-150] - Unexpectedly large processor lock contention
* [RVM-154] - A shutdown hook can hang RVM
* [RVM-155] - SynchronizationBarrier.removeProcessor assertion failure
* [RVM-159] - OSR-guarded inlining should not be allowed in uninterruptible code
* [RVM-181] - ClassCastException in OPT_Simplifier when running antlr DaCapo
* [RVM-183] - Thread sitting on >1 queue
* [RVM-194] - Assertion failure in OSR State Extractor running chart
* [RVM-198] - NPE when unlocking lock
* [RVM-201] - Classpath AWT is broken
* [RVM-203] - terminal not in grammar: new
* [RVM-204] - Reduce wasted code space on inline allocation path
* [RVM-206] - Stack walking in MMTk not correctly identifying not yet obsolete methods?
* [RVM-209] - Bootimage bloat broke ppc64-aix images
* [RVM-213] - jbb2005 performance regression
* [RVM-216] - MMTk assertion failure during jbb large heap performance runs
* [RVM-219] - Address.attempt*() compiles incorrectly on IA32 with Jikes 2.9.1
* [RVM-220] - jbb2005 GC performance mode: Warning: number of GC phases exceeds MAX_PHASES
* [RVM-242] - Build break: BaseBaseGCTrace
* [RVM-245] - Change to deques appears to have significantly reduced hsqldb performance
* [RVM-270] - NPEs from barrier code not working
* [RVM-277] - lusearch fails on PPC32 due to validation error
* [RVM-279] - Performance regression
* [RVM-293] - Class loaders do not isolate packages with the same name
* [RVM-297] - Classpath 0.96 configure problems with JDK 1.6
* [RVM-298] - DaCapo chart broken on classpath 0.96
* [RVM-299] - possible performance regression on xalan on classpath 0.96
* [RVM-301] - JSR 166 failures

Tasks and Sub-tasks

* [RVM-38] - VM_BaselineBootImageCompiler should use System.nanoTime rather than DNA for compilation time
* [RVM-286] - _201_compress took a 10% hit when we switched to Arnold/Grove call graph profiling; investigate
* [RVM-217] - Recode spin loop in org.mmtk.utility.deque.Deque spinWait to reduce frequency of nanoTime calls
* [RVM-230] - Determine whether patching Classpath sources is preferable to bytecode engineering adding annotations
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Jikes RVM 2.9.1 available

2007-07-03T13:36:02Z

We're very proud to announce that Jikes RVM version 2.9.1 is now available for download. There's been quite a bit of activity on the project since 2.9.0, and all kinds of good reasons to move up to this new version of Jikes RVM!

The release is available at http://downloads.sourceforge.net/jikesrvm/jikesrvm-2.9.1.tar.bz2. The release notes are appended below:

*Jikes RVM 2.9.1 Release Notes (July 2, 2007)
** Highlights

*** A major stability drive has resulted in Jikes RVM being able to
reliably run the entire DaCapo benchmark suite on ia32-linux.
The following issues were resolved to make this possible:

multiple benchmarks:
r12809: Missed lock prefix (stack scanning failures).
r12737: GC map iterator crashed on dynamic link frames.

eclipse:
r12302: Classpath RandomAccessFile incorrectly truncated.
r12394: PLOS exhaustion bug in MMTk.
r12375: ThinLock of interface from OPT code.
r12815: Bad GC map in JNI methods.
r12722: Fix for GC map bugs around expection throws.

lusearch:
r12602: Floating point precision (SSE2).
r12633: Parallel hardware traps.

hsqldb:
r12683: Invalid assertion in VM_Thread.

xalan:
r12742: Missing static initializer broke jar caching (halves runtime).
r12753: FileOutputStream wastefully copying arrays (halves runtime).

*** New eclipse-project ant target to make it easy to get up and running
in eclipse.

*** As part of the stability drive, many O2 optimizations in the
optimizing compiler have been moved to O3 (and thus are not enabled by
default). The performance impact of this has been mixed. For example,
on ia32-linux SPECjvm98 performance actually improved by 29% due to
massive improvements in mtrt and mpegaudio enabled by SSE2. Performance
on SPECjbb2005 degraded by 3-10%. There were significant gains on some
individual DaCapo benchmarks (most notably xalan).
Re-building an aggressive O2 optimization package by stabilizing
current O3 optimizations and by building new optimization passes will be
one of the focus areas for the project going forward.

*** The recommended version of GNU classpath is 0.95.
Earlier versions of GNU classpath are not supported.

*** SSA expression folding has been expanded to cover far more cases than
previously. This leads to a > 1% speedup on benchmarks such as SpecJBB'05.

*** Source code analysis of the code base has been enabled using PMD
(http://pmd.sourceforge.net/). Basic analysis is enabled by default and
this will expand over time.

*** Methods in VM_Type that duplicated functionality in VM_TypeReference
now delegate to associated VM_TypeReference.

*** The ability to force a garbage collection after N allocations or at every
exception delivery has been revived and is controlled by the configuration
variable config.stress-gc-interval which should be set to non-zero value to
enable.

*** Simplistic debug symbols to show boot image method entry points in
gdb. Resolved issues with rvm script so this works with rvm -gdb now.

*** New faster primary regression machine (Core 2 Duo) for ia32-linux
at ANU. Resolved performance issues with previous regression machine.

*** Introduced the capability to patch against classpath versions. This allows
us to keep backported performance optimizations and/or bug fixes

*** Implementation of returning global JNI references from C to Java.

*** VM_ prefix added to classes that must be included in the primordial
class list. Classes affected include; PrintLN, PrintContainer,
ApplicationClassLoader, DebuggerThread, FinalizerThread, MainThread,
PPC_Disassembler, opcode_tab and opcodeXX.

*** Classes in the adaptive package have been reorganized into packages
to match the directory layout in 2.4.6 release.

*** Classes that resided in the objectmodel directory in 2.4.6 have
been moved in to the "org.jikesrvm.objectmodel" package.

*** Classes that resided in the scheduler directory in 2.4.6 have
been moved in to the "org.jikesrvm.scheduler" package.

*** Classes that resided in the runtime directory in 2.4.6 have
been moved in to the "org.jikesrvm.runtime" package.

** Bug fixes

*** Baseline GC map bug for handler blocks affecting SPECjbb2000
(r12685).

*** Classpath race in cloning of XML Node affecting SPECjbb2005
(r12395).

*** Fix final field chasing in OPT_Simplifier and re-enable constant
folding for fields.

*** A GC map generation problem caused by casting Address to Objects
and has been eliminated.
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Jikes RVM 2.9.0 is now available

2007-03-15T12:33:22Z

We're very happy to announce a new release of Jikes RVM: version 2.9.0. Quite a bit has changed since 2.4.6 and we'd welcome feedback on the changes as we head towards a 3.0 release later this year. Thanks again to everyone who has pitched in to make this one of the most exciting Jikes RVM releases since our initial open source release in 2001!

The release is available at http://downloads.sourceforge.net/jikesrvm/jikesrvm-2.9.0.tar.bz2. The release notes are appended below:

*Jikes RVM 2.9.0 Release Notes (March 15, 2007)
** Highlights

*** The five months since the release of 2.4.6 have been one of the most
active periods in the open source history of the project. A number
of significant changes have been made to clean up and modernize the
code base to enable future evolution.

*** We have made large scale changes to the structure of the source code
to prepare for development of Jikes RVM from within standard Java IDEs.

*** There is a new, ant-based, build and test system that have replaced
jconfigure and RunSanityTests.

*** We now use ecj (the Eclipse Java compiler) instead of jikes to compile
our Java source files and have eliminated the preprocessor.

*** The userguide has been moved from latex into a wiki. It has been updated
to describe the new build and test systems.
The release tarball contains a pdf and html version of the userguide.

*** We now support Java5, we have switched to using the generics branch
of GNU Classpath, and much of Jikes RVM has been rewritten to use
Java 5 language features and generic types.

*** We have switched to using Java5 annotations for pragmas/magic.

*** The recommended version of GNU classpath is 0.93-generics.
Earlier versions of GNU classpath are not supported.

*** Support in the PPC baseline compiler for storing local variables in
registers.

*** Refactor of type system and JTOC.

*** Support for packing subword sized fields in objects. Removal of hand
packed fields. Various memory savings.

*** System calls now supported in any file using SysCall annotation on a
native method. VM_SysCall now generates implementation from annotation.
VMMath now implemented using system calls.

*** Support for chasing final fields reached from literal or static final
fields. Greater optimization of object constant operands.

*** Greater support for 387 constants. Simplification of 387 BURS rules.

** Bug fixes

*** Yes...many :) For details: svn log -r10915:11866

** Other Notes

*** The Quick compiler has been deleted. It is now available as a
patch on the research tracker, or via older releases (2.3.4
through 2.4.6).

*** The HPM (Hardware Performance Monitor) code has been deleted.
It is now available on the research tracker (item 1613215),
by svn diff -r11162:11161, or in releases through 2.4.6.

*** This release is known to not work on OS X. We would like to get this
platform working again; if you use Jikes RVM on OS X and are willing to
help fix it, please let us know.

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Jikes RVM 2.4.6 now available

2006-10-19T14:39:41Z

Jikes RVM version 2.4.6 is now available for download from sourceforge.net at
http://prdownloads.sourceforge.net/jikesrvm/jikesrvm-2.4.6.tar.gz?download

** Highlights
*** The recommended version of GNU classpath for Jikes RVM 2.4.6 is 0.92.
Earlier versions of GNU classpath are not supported.

*** A large scale restructuring of the source tree was performed
to prepare for making it easier to develop Jikes RVM using Eclipse.
All files except for the Java source to Jikes RVM itself was moved
out of the RVM_ROOT/rvm directory. RVM_ROOT/rvm itself has not yet
been reorganized so that package/directory structures match, but we
anticipate this happening in the near future.

*** Major refactoring of VM<->MM interface

*** MMTk: Added nurseries to each LOS and created a distinct "primitive large
object space" (PLOS).

*** The optimizing compiler is now reentrant and a command line options
to enable parallel bootimage compilation has been added to jbuild
(-numThreads=<n>).

*** Updates and improvements to GCspy support (patch 1576064).

** Bug fixes
Too many to list individually in the release notes. Yeah!
Overall a significant increase in system stability since 2.4.5.
See svnlog -r10694:10905 for the gory details.

** Other Notes

*** Change bootimage options for the opt compiler to use default static
inlining heurisitcs (instead of being more aggressive). This reduces
bootimage size by 20%, bootimage build time by 2-3x, and appears to have
minimal performance impact.

*** We now implement JNI_OnLoad functionality.

*** Modifications to the boot image writer and VM.boot so that certain
known fields are populated during boot image write time, thereby
avoiding the need to run class initializers in VM.boot. Typically
we fail to populate a field value when it's part of the bootstrap
JVM and in some way protected. Further improvements to this mechanism
are in progress.

*** If GNU classpath is built with JAWT support, the Jikes RVM build process
now copies the additional native libraries it requires.

*** Added regression testing support for latest version (2006-10-RC2) of
DaCapo benchmarks and for SPECjbb2005. Also updated soot test to 2.2.3.

*** We can now build using the IBM 5.0 JVMs as hosts. However, you
must set HOST_VM_TYPE=IBM-50 to activate code in the bootimage
writer makefile that works around what appears to be a JIT bug.

*** GNU classpath support for java.lang.instrumentation and the
-javaagent command line argument was added.

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Jikes RVM 2.4.5 now available

2006-08-14T11:37:34Z

Jikes RVM version 2.4.5 is now available for download from sourceforge.net at
http://prdownloads.sourceforge.net/jikesrvm/jikesrvm-2.4.5.tar.gz?download

*Jikes RVM 2.4.5 Release Notes (released August 14, 2006)
** Highlights
*** The recommended version of GNU classpath for Jikes RVM 2.4.5 is 0.92.
GNU classpath version 0.91 will work, but Jikes RVM 2.4.5 will not
compile against versions of GNU classpath before 0.91.

*** Classpath AWT and Swing tests now run with the Jikes RVM. We have changed
from using the portable native sync code, and addressed issues with M-to-N
threading.

*** We can now load and run Java 1.5.0 Java class files. Support includes
building the Jikes RVM using a 1.5.0 javac compiler and running the
SPEC JBB 2005 benchmark. Includes reflection support for generic types.

*** MMTk changes & refactors. A mark-compact collector has been added. A
number of key bugs have been fixed, both in the vm (eg baseline GC
maps), and in MMTk proper. Completed a major refactoring of
"locals" to explicitly separate per-mutator and per-collector
contexts. This generalizes away from assumptions of the current
Jikes RVM threading model.

*** We can now load runtime and non-runtime annotations. Runtime support
is limited as Classpath is missing the base annotation definitions.
A work around is to switch on non-runtime annotation loading in the RVM.
NOTE: This requires classpath 0.91 or better.

*** Added ability to perform boot image root scanning, and thus avoid
tracing through the boot image at each full heap GC. As a result,
we've added a third region to the bootimage; all config files must
now define BOOTIMAGE_RMAP_ADDRESS in addition to BOOTIMAGE_DATA_ADDRESS
and BOOTIMAGE_CODE_ADDRESS.

** Bug fixes
1442437: to match Sun behavior, java.lang.Class.newInstance now passes
through exceptions instead of wrapping in InstantiationExceptions.
NOTE: This requires classpath 0.90 or better.

1505824: Exit cleanly when the jar file given to -jar doesn't contain a valid ma
nifest

1494784: Intermittent build failure on IA32 due to imprecise estimation of
instruction size in code used for short forward jump optimization.

1147554: MarkSweep double-mark: corrects performance problem in MMTk MarkSweep
code which was marking both a bit in the object and a side mark map.

** Other Notes
*** IA32 BURS improvement for special case of COND_MOV contibuted by
Garrett Kolpin
*** Improvements to OPT_Simplifier to catch a number of additional cases.

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Jikes RVM 2.4.4 released

2006-03-15T08:51:36Z

Jikes RVM version 2.4.4 is now available for download from sourceforge.net
at
http://prdownloads.sourceforge.net/jikesrvm/jikesrvm-2.4.4.tar.gz?download

The main change since version 2.4.3 is that we've moved from GNU Classpath
0.23 to 0.90. The release notes are appended:

*Jikes RVM 2.4.4 Release Notes (released March 15, 2006)
** Highlights
*** The recommended version of GNU classpath for Jikes RVM 2.4.3 is 0.90.
Classpath 0.18, 0.19, and 0.20 are likely to still work, but have not
been tested.

** Bug fixes
** Other Notes
*** There is now an x86_64-pc-linux-gnu config file for build Jikes RVM.

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Jikes RVM 2.4.3 available

2006-02-24T08:25:52Z

Jikes RVM version 2.4.3 is now available for download from sourceforge.net
at
http://prdownloads.sourceforge.net/jikesrvm/jikesrvm-2.4.3.tar.gz?download

*Jikes RVM 2.4.3 Release Notes (released February 24, 2006)
** Highlights
*** The recommended version of GNU classpath for Jikes RVM 2.4.3 is 0.20.
Classpath 0.19 and 0.18 are likely to still work, but have not been
tested.
Support for all version of GNU classpath prior to 0.18 has been
removed.

*** Simple GC sanity checking tool added to MMTk. Contact: Daniel
Frampton.

*** The RVM bootimage is now generated into two separate files, one for
code and one for data. These files are mapped separately into
distinct
address ranges. As a result of this change, instead of defining
BOOTIMAGE_LOAD_ADDRESS in your config file, you must define
BOOTIMAGE_DATA_ADDRESS and BOOTIMAGE_CODE_ADDRESS.
All the default configu files (rvm/config/*) have been updated,
but if you have local copies of these files, you will need to update
them.

*** Loop Versioning optimization in the opt compiler
contributed by Ian Rogers and Jisheng Zhao.
Loop versioning replicates loop bodies and removes from one of
those loop bodies runtime exceptions that can be explicitly
tested. The phase runs as an SSA optimization so as only to
consider true dependencies. To capture the loop structure the
phase uses an annotated LST node. The annotations capture
information about the initial and terminal loop iterator values,
as well as the loop iterator instructions. This phase is currently
disabled by default until we can fix bugs in the optimizing compiler
that it exposes.

*** The optimizing compiler's Local CSE pass now exploits commutativity,
patch contributed by Bernardo Pastorelli.

** Bug fixes
*** defect 1240267: remove FIXED_JTOC option
*** defect 1411486: Bug in IA32 BT (Bit Test) instruction

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[Jikesrvm-researchers] Jikes RVM 2.4.2 available

2005-11-21T12:23:07Z

Jikes RVM version 2.4.2 is now available for download from sourceforge.net
at
http://prdownloads.sourceforge.net/jikesrvm/jikesrvm-2.4.2.tar.gz?download

*Jikes RVM 2.4.2 Release Notes (released on November 21, 2005)
**Highlights
**The recommended version of GNU classpath for Jikes RVM 2.4.2 is 0.19.
Classpath 0.18 is expected to still work, Classpath 0.15 and 0.17 may
still work, but have not been tested.

** RunSanityTest support for DaCapo benchmark suite. DaCapo is now
included
in the nightly Jikes RVM regression tests. We continue to solicit
contributions of more RunSanityTest harnesses for additional benchmarks.

** Numerous bug fixes in the opt compiler to better maintain IR
invariants
during. Contributed by Ian Rogers.

**Bug Fixes
*** defect 1293619: Null Pointer Exception in VM_TypeReference
*** Minor fixes for OS X builds.

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[Jikesrvm-researchers] Jikes RVM 2.4.1 released

2005-09-15T12:30:28Z

Jikes RVM version 2.4.1 is now available for download from sourceforge.net
at
http://prdownloads.sourceforge.net/jikesrvm/jikesrvm-2.4.1.tar.gz?download

The main change in this release is support for classpath 0.18, although
there are also some opt compiler bug fixes and enhancements.

The Release Notes are appended below.

*Highlights
**The recommended version of GNU classpath for Jikes RVM 2.4.1 is 0.18.
Classpath 0.17 is expected to still work, Classpath 0.15 may still
work, but has not been tested.

** Support for triggering recompilation of dynamically loaded methods
It is now possible for an application running on Jikes RVM to request
that the system recompile all dynamically loaded methods at any point
in the application. This can be accomplished by a new VM_Callbacks
method. Details are in the user's guide.

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