And an alternative is to use google heap profiler (which works as part of
tcmalloc). I find the latter to be very useful, sometimes even more so than
valgrind.
Andreas
From: Mitch Hayenga
<mitch.hayenga+g...@gmail.com<mailto:mitch.hayenga+g...@gmail.com>>
Reply-To: gem5 users mailing list
<gem5-users@gem5.org<mailto:gem5-users@gem5.org>>
Date: Friday, 20 September 2013 01:33
To: gem5 users mailing list <gem5-users@gem5.org<mailto:gem5-users@gem5.org>>
Subject: Re: [gem5-users] Valgrind is not working for GEM5
Hi,
This happens to me whenever I compile with google's tcmalloc. If you have
that, try disabling it. I tend to just remove the tcmalloc package and do a
fresh rebuild whenever I need to use valgrind to debug memory issues. This is
just because by default valgrind doesn't recognize/trap the alloc/free calls
with that library (though I'm sure there is a way to make it do so).
Note: when using valgrind you will want to enable the suppressions present in
util/valgrind-suppressions to disable false/superfluous warnings.
Hope this helps.
On Thu, Sep 19, 2013 at 5:50 PM, Naranjo Carmona, Alberto Javier
<ajn...@neo.tamu.edu<mailto:ajn...@neo.tamu.edu>> wrote:
Hi everyone!
I am running some test with PARSEC with X86 architecture in detailed mode and I
noted that I might have a memory leak because after some time the gem5 process
consumes a great part of the memory in the server (more than 66GB).
I ran Valgrind to find any potential but the result was "total heap usage: 0
allocs, 0 frees, 0 bytes allocated", which is not convincent because it
obviously allocated memory.
So, in order to prove this, I deliberately added a leak in the code (called
malloc several times in /src/sim/simulate.cc and didn't free it) hoping for
Valgrind to detect it but the result was the same.
Do you know why Valgrind apparently does not see through GEM5?
Do you know of any other method or tool I can use to find the memory leaks?
The command I'm using is
valgrind --tool=memcheck --leak-check=yes ./build/X86/gem5.debug -d
simout/ff_Blackscholes/ ./configs/example/ruby_fs.py
--kernel=x86_64-vmlinux-2.6.28.4-smp --script=runscript/blackscholes.rcS -F
437696510 --cpu-type=detailed --num-cpus=16 --num-dirs=16 --topology=Mesh
--num-l2caches=16 --mesh-rows=4 --garnet-network=fixed
Thanks for your help!!!
--
Alberto Javier Naranjo-Carmona
M.S. Student Electrical Engineering
Computer Engineering & Systems Group
Texas A&M University, College Station, TX
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