How do I run K-3D with limits on both Memory and Processor usage.

[Daniel Scott Matthews]

I have a quad core system with 4GB RAM running a server kernel yet
there are occasional bugs with K-3D that lock up the system completely
and I suspect it is due to a memory leak that is grabbing 100% of the
resources. I also have 32GB of swap in a fast RAID configuration but
that just lets K-3D gobble up even more memory. :-)

How can I run the application so that it is limited to 2GB of RAM (no
swap at all) and only 2 cores, so that I can switch to the debugger
and halt the application in a way that will let be know what part of
the code was so greedy?

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[Timothy M. Shead]

Daniel Scott Matthews wrote:

> I have a quad core system with 4GB RAM running a server kernel yet
> there are occasional bugs with K-3D that lock up the system completely
> and I suspect it is due to a memory leak that is grabbing 100% of the
> resources. I also have 32GB of swap in a fast RAID configuration but
> that just lets K-3D gobble up even more memory. :-)
>
> How can I run the application so that it is limited to 2GB of RAM (no
> swap at all) and only 2 cores, so that I can switch to the debugger
> and halt the application in a way that will let be know what part of
> the code was so greedy?

As long as K3D_BUILD_INOTIFY_MODULE,
K3D_BUILD_NGUI_SPACE_NAVIGATOR_MODULE, and K3D_ENABLE_PARALLEL are
"OFF", there shouldn't be any multi-threaded code running at all.

Take a look at the documentation for "ulimit" to see how you can limit
the time, memory, files, and threads that a process can use.

Cheers,
Tim

[tshead.vcf]

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---

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[Daniel Scott Matthews]

On Mon, Nov 2, 2009 at 9:28 AM, Timothy M. Shead <tshead@...> wrote:

> Daniel Scott Matthews wrote:
>>
>> I have a quad core system with 4GB RAM running a server kernel yet
>> there are occasional bugs with K-3D that lock up the system completely
>> and I suspect it is due to a memory leak that is grabbing 100% of the
>> resources. I also have 32GB of swap in a fast RAID configuration but
>> that just lets K-3D gobble up even more memory. :-)
>>
>> How can I run the application so that it is limited to 2GB of RAM (no
>> swap at all) and only 2 cores, so that I can switch to the debugger
>> and halt the application in a way that will let be know what part of
>> the code was so greedy?
>
> As long as K3D_BUILD_INOTIFY_MODULE, K3D_BUILD_NGUI_SPACE_NAVIGATOR_MODULE,
> and K3D_ENABLE_PARALLEL are "OFF", there shouldn't be any multi-threaded
> code running at all.
>
> Take a look at the documentation for "ulimit" to see how you can limit the
> time, memory, files, and threads that a process can use.
>

That did the trick, it looks like the issue is triggered by the
3DSMeshReader but is in the SDK, and this is on a file that did load
OK in the past! I even hand edited the .k3d file so that the .3ds file
was in the same directory to reduce complications, no luck.

xterm &

ulimit -m 2000000 -v 1000000
make run-gdb/fast
run

...
 DEBUG: Triggering event for /home/daniel/projects/k3d_artwork/COW_L.3DS
 INFO: Loading /home/daniel/projects/k3d_artwork/COW_L.3DS using 3DSMeshReader

Program received signal SIGSEGV, Segmentation fault.
0x00002aaaab49e944 in k3d::selection::operator<< (Stream=Cannot access
memory at address 0x7fffe9264ff8
) at /home/daniel/projects/k3d/k3dsdk/selection.cpp:42
42      {
(gdb) bt
#0  0x00002aaaab49e944 in k3d::selection::operator<< (Stream=Cannot
access memory at address 0x7fffe9264ff8
) at /home/daniel/projects/k3d/k3dsdk/selection.cpp:42
#1  0x00002aaaab49ead0 in k3d::selection::operator<< (Stream=...,
RHS=@0x7fffffffa6cc) at
/home/daniel/projects/k3d/k3dsdk/selection.cpp:88
#2  0x00002aaaab49ead0 in k3d::selection::operator<< (Stream=...,
RHS=@0x7fffffffa6cc) at
/home/daniel/projects/k3d/k3dsdk/selection.cpp:88
#3  0x00002aaaab49ead0 in k3d::selection::operator<< (Stream=...,
RHS=@0x7fffffffa6cc) at
/home/daniel/projects/k3d/k3dsdk/selection.cpp:88
#4  0x00002aaaab49ead0 in k3d::selection::operator<< (Stream=...,
RHS=@0x7fffffffa6cc) at
/home/daniel/projects/k3d/k3dsdk/selection.cpp:88
#5  0x00002aaaab49ead0 in k3d::selection::operator<< (Stream=...,
RHS=@0x7fffffffa6cc) at
/home/daniel/projects/k3d/k3dsdk/selection.cpp:88


...
ad infinitum

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