[rvm-research] Turning off synchronisation
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[rvm-research] Turning off synchronisation
by Khilan Gudka-2
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Dear all,
Is there any easy way to turn synchronized into a no-op? I would like to do various (timing) comparisons like against a version with no synchronisation. Khilan -- Khilan Gudka PhD Student Department of Computing Imperial College London http://www.doc.ic.ac.uk/~khilan/ ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Jikesrvm-researchers mailing list Jikesrvm-researchers@... https://lists.sourceforge.net/lists/listinfo/jikesrvm-researchers |
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Re: [rvm-research] Turning off synchronisation
by Filip Pizlo-2
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See ThinLock.java. Assuming you're doing this in the adaptive
configs, simply changing inlineLock and inlineUnlock to do nothing and return will get you pretty close. The baseline compiler will still emit calls to locking methods, but the speed of baseline-executed code does not have a significant impact on the speed of the program overall. Another thing to note is that the RVM uses biased locking, which is quite fast - by default, monitors don't lead to any synchronization at all - just a load, compare, store. Something to worry about is that the VM itself uses locks. :-) So you may get some very interesting crashes when you do this! -Filip On Sep 8, 2009, at 6:36 , Khilan Gudka wrote: > Dear all, > > Is there any easy way to turn synchronized into a no-op? I would like > to do various (timing) comparisons like against a version with no > synchronisation. > > Khilan > > -- > Khilan Gudka > PhD Student > Department of Computing > Imperial College London > http://www.doc.ic.ac.uk/~khilan/ > > > ------------------------------------------------------------------------------ > Let Crystal Reports handle the reporting - Free Crystal Reports 2008 > 30-Day > trial. Simplify your report design, integration and deployment - and > focus on > what you do best, core application coding. Discover what's new with > Crystal Reports now. http://p.sf.net/sfu/bobj-july > _______________________________________________ > Jikesrvm-researchers mailing list > Jikesrvm-researchers@... > https://lists.sourceforge.net/lists/listinfo/jikesrvm-researchers ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Jikesrvm-researchers mailing list Jikesrvm-researchers@... https://lists.sourceforge.net/lists/listinfo/jikesrvm-researchers |
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Re: [rvm-research] Turning off synchronisation
by David P Grove
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Khilan Gudka <khilan@...> wrote on 09/08/2009 06:36:07 AM: |
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Re: [rvm-research] Turning off synchronisation
by Emery Berger
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Another possibility - which would allow you to use other JVMs, should
you so desire, and would probably be easier than modifying the Jikes compiler - would be to use bytecode rewriting. Which raises a good question - what Java bytecode rewriters are people using these days? -- Emery Berger Associate Professor Dept. of Computer Science University of Massachusetts www.cs.umass.edu/~emery 2009/9/8 David P Grove <groved@...>: > Khilan Gudka <khilan@...> wrote on 09/08/2009 06:36:07 AM: >> >> Is there any easy way to turn synchronized into a no-op? I would like >> to do various (timing) comparisons like against a version with no >> synchronisation. >> > > Since Jikes RVM uses Java synchronization for its own implementation, I > think it is fairly unlikely that no-oping all synchronization is likely to > yield a working VM. > > Probably your best bet would be to try to modify the optimizing compiler to > no-op monitorenter/exit bytecodes for selected application classes. Won't > be perfect, but maybe enough for you to see something. > > --dave > > ------------------------------------------------------------------------------ > Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day > trial. Simplify your report design, integration and deployment - and focus > on > what you do best, core application coding. Discover what's new with > Crystal Reports now. http://p.sf.net/sfu/bobj-july > _______________________________________________ > Jikesrvm-researchers mailing list > Jikesrvm-researchers@... > https://lists.sourceforge.net/lists/listinfo/jikesrvm-researchers > > ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Jikesrvm-researchers mailing list Jikesrvm-researchers@... https://lists.sourceforge.net/lists/listinfo/jikesrvm-researchers |
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Re: [rvm-research] Turning off synchronisation
by Filip Pizlo-2
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I'm an ASM fan (http://asm.ow2.org/). This would be quite trivial in
ASM. -Filip On Sep 8, 2009, at 13:39 , Emery Berger wrote: > Another possibility - which would allow you to use other JVMs, should > you so desire, and would probably be easier than modifying the Jikes > compiler - would be to use bytecode rewriting. Which raises a good > question - what Java bytecode rewriters are people using these days? > > -- > Emery Berger > Associate Professor > Dept. of Computer Science > University of Massachusetts > www.cs.umass.edu/~emery > > > > 2009/9/8 David P Grove <groved@...>: >> Khilan Gudka <khilan@...> wrote on 09/08/2009 06:36:07 AM: >>> >>> Is there any easy way to turn synchronized into a no-op? I would >>> like >>> to do various (timing) comparisons like against a version with no >>> synchronisation. >>> >> >> Since Jikes RVM uses Java synchronization for its own >> implementation, I >> think it is fairly unlikely that no-oping all synchronization is >> likely to >> yield a working VM. >> >> Probably your best bet would be to try to modify the optimizing >> compiler to >> no-op monitorenter/exit bytecodes for selected application >> classes. Won't >> be perfect, but maybe enough for you to see something. >> >> --dave >> >> ------------------------------------------------------------------------------ >> Let Crystal Reports handle the reporting - Free Crystal Reports >> 2008 30-Day >> trial. Simplify your report design, integration and deployment - >> and focus >> on >> what you do best, core application coding. Discover what's new with >> Crystal Reports now. http://p.sf.net/sfu/bobj-july >> _______________________________________________ >> Jikesrvm-researchers mailing list >> Jikesrvm-researchers@... >> https://lists.sourceforge.net/lists/listinfo/jikesrvm-researchers >> >> > > ------------------------------------------------------------------------------ > Let Crystal Reports handle the reporting - Free Crystal Reports 2008 > 30-Day > trial. Simplify your report design, integration and deployment - and > focus on > what you do best, core application coding. Discover what's new with > Crystal Reports now. http://p.sf.net/sfu/bobj-july > _______________________________________________ > Jikesrvm-researchers mailing list > Jikesrvm-researchers@... > https://lists.sourceforge.net/lists/listinfo/jikesrvm-researchers ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Jikesrvm-researchers mailing list Jikesrvm-researchers@... https://lists.sourceforge.net/lists/listinfo/jikesrvm-researchers |
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Re: [rvm-research] Turning off synchronisation
by Steve Blackburn
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Yes, asm is the popular choice these days. Furthermore, it is one of
our build dependencies already (we use it for adding annotations). --Steve On 09/09/2009, at 3:44 AM, Filip Pizlo wrote: > I'm an ASM fan (http://asm.ow2.org/). This would be quite trivial in > ASM. > > -Filip > > > > On Sep 8, 2009, at 13:39 , Emery Berger wrote: > >> Another possibility - which would allow you to use other JVMs, should >> you so desire, and would probably be easier than modifying the Jikes >> compiler - would be to use bytecode rewriting. Which raises a good >> question - what Java bytecode rewriters are people using these days? >> >> -- >> Emery Berger >> Associate Professor >> Dept. of Computer Science >> University of Massachusetts >> www.cs.umass.edu/~emery >> >> >> >> 2009/9/8 David P Grove <groved@...>: >>> Khilan Gudka <khilan@...> wrote on 09/08/2009 06:36:07 AM: >>>> >>>> Is there any easy way to turn synchronized into a no-op? I would >>>> like >>>> to do various (timing) comparisons like against a version with no >>>> synchronisation. >>>> >>> >>> Since Jikes RVM uses Java synchronization for its own >>> implementation, I >>> think it is fairly unlikely that no-oping all synchronization is >>> likely to >>> yield a working VM. >>> >>> Probably your best bet would be to try to modify the optimizing >>> compiler to >>> no-op monitorenter/exit bytecodes for selected application >>> classes. Won't >>> be perfect, but maybe enough for you to see something. >>> >>> --dave >>> >>> ------------------------------------------------------------------------------ >>> Let Crystal Reports handle the reporting - Free Crystal Reports >>> 2008 30-Day >>> trial. Simplify your report design, integration and deployment - >>> and focus >>> on >>> what you do best, core application coding. Discover what's new with >>> Crystal Reports now. http://p.sf.net/sfu/bobj-july >>> _______________________________________________ >>> Jikesrvm-researchers mailing list >>> Jikesrvm-researchers@... >>> https://lists.sourceforge.net/lists/listinfo/jikesrvm-researchers >>> >>> >> >> ------------------------------------------------------------------------------ >> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 >> 30-Day >> trial. Simplify your report design, integration and deployment - and >> focus on >> what you do best, core application coding. Discover what's new with >> Crystal Reports now. http://p.sf.net/sfu/bobj-july >> _______________________________________________ >> Jikesrvm-researchers mailing list >> Jikesrvm-researchers@... >> https://lists.sourceforge.net/lists/listinfo/jikesrvm-researchers > > > ------------------------------------------------------------------------------ > Let Crystal Reports handle the reporting - Free Crystal Reports 2008 > 30-Day > trial. Simplify your report design, integration and deployment - and > focus on > what you do best, core application coding. Discover what's new with > Crystal Reports now. http://p.sf.net/sfu/bobj-july > _______________________________________________ > Jikesrvm-researchers mailing list > Jikesrvm-researchers@... > https://lists.sourceforge.net/lists/listinfo/jikesrvm-researchers ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Jikesrvm-researchers mailing list Jikesrvm-researchers@... https://lists.sourceforge.net/lists/listinfo/jikesrvm-researchers |
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Re: [rvm-research] Turning off synchronisation
by Khilan Gudka-2
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Hi,
Thanks for the advice. I'm using Soot. Khilan -- Khilan Gudka PhD Student Department of Computing Imperial College London http://www.doc.ic.ac.uk/~khilan/ On 8 Sep 2009, at 21:02, Steve Blackburn wrote: > Yes, asm is the popular choice these days. Furthermore, it is one of > our build dependencies already (we use it for adding annotations). > > --Steve > > On 09/09/2009, at 3:44 AM, Filip Pizlo wrote: > >> I'm an ASM fan (http://asm.ow2.org/). This would be quite trivial in >> ASM. >> >> -Filip >> >> >> >> On Sep 8, 2009, at 13:39 , Emery Berger wrote: >> >>> Another possibility - which would allow you to use other JVMs, >>> should >>> you so desire, and would probably be easier than modifying the Jikes >>> compiler - would be to use bytecode rewriting. Which raises a good >>> question - what Java bytecode rewriters are people using these days? >>> >>> -- >>> Emery Berger >>> Associate Professor >>> Dept. of Computer Science >>> University of Massachusetts >>> www.cs.umass.edu/~emery >>> >>> >>> >>> 2009/9/8 David P Grove <groved@...>: >>>> Khilan Gudka <khilan@...> wrote on 09/08/2009 06:36:07 AM: >>>>> >>>>> Is there any easy way to turn synchronized into a no-op? I would >>>>> like >>>>> to do various (timing) comparisons like against a version with no >>>>> synchronisation. >>>>> >>>> >>>> Since Jikes RVM uses Java synchronization for its own >>>> implementation, I >>>> think it is fairly unlikely that no-oping all synchronization is >>>> likely to >>>> yield a working VM. >>>> >>>> Probably your best bet would be to try to modify the optimizing >>>> compiler to >>>> no-op monitorenter/exit bytecodes for selected application >>>> classes. Won't >>>> be perfect, but maybe enough for you to see something. >>>> >>>> --dave >>>> >>>> ------------------------------------------------------------------------------ >>>> Let Crystal Reports handle the reporting - Free Crystal Reports >>>> 2008 30-Day >>>> trial. Simplify your report design, integration and deployment - >>>> and focus >>>> on >>>> what you do best, core application coding. Discover what's new with >>>> Crystal Reports now. http://p.sf.net/sfu/bobj-july >>>> _______________________________________________ >>>> Jikesrvm-researchers mailing list >>>> Jikesrvm-researchers@... >>>> https://lists.sourceforge.net/lists/listinfo/jikesrvm-researchers >>>> >>>> >>> >>> ------------------------------------------------------------------------------ >>> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 >>> 30-Day >>> trial. Simplify your report design, integration and deployment - and >>> focus on >>> what you do best, core application coding. Discover what's new with >>> Crystal Reports now. http://p.sf.net/sfu/bobj-july >>> _______________________________________________ >>> Jikesrvm-researchers mailing list >>> Jikesrvm-researchers@... >>> https://lists.sourceforge.net/lists/listinfo/jikesrvm-researchers >> >> >> ------------------------------------------------------------------------------ >> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 >> 30-Day >> trial. Simplify your report design, integration and deployment - and >> focus on >> what you do best, core application coding. Discover what's new with >> Crystal Reports now. http://p.sf.net/sfu/bobj-july >> _______________________________________________ >> Jikesrvm-researchers mailing list >> Jikesrvm-researchers@... >> https://lists.sourceforge.net/lists/listinfo/jikesrvm-researchers > > > ------------------------------------------------------------------------------ > Let Crystal Reports handle the reporting - Free Crystal Reports 2008 > 30-Day > trial. Simplify your report design, integration and deployment - and > focus on > what you do best, core application coding. Discover what's new with > Crystal Reports now. http://p.sf.net/sfu/bobj-july > _______________________________________________ > Jikesrvm-researchers mailing list > Jikesrvm-researchers@... > https://lists.sourceforge.net/lists/listinfo/jikesrvm-researchers ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Jikesrvm-researchers mailing list Jikesrvm-researchers@... https://lists.sourceforge.net/lists/listinfo/jikesrvm-researchers |
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Re: [rvm-research] Turning off synchronisation
by Khilan Gudka-2
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Hi,
I've been looking through the rvm command line flags here: http://www.jikesrvm.org/Running+the+RVM and noticed the flag no_synchro for the optimising compiler. However, this flag doesn't seem to exist anymore or has it been moved somewhere else? Thanks -- Khilan Gudka PhD Student Department of Computing Imperial College London On 8 Sep 2009, at 21:06, Khilan Gudka wrote:
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