[SOLVED] Using jemalloc's memory profiler

demon007 · 06-12-2012, 04:24 AM

I am trying to use jemalloc's memory profiler in my code to get the idea of how memory allocation is happening in it.

I have installed jemalloc using the prefix "--enable-prof" but while compiling my code, I was getting undefined reference for "mallctl".

I am not able find which library I have to link to make it work.

Please help me. I am trying this for over three weeks.

Thank You.

pan64 · 06-12-2012, 11:32 AM

I found no documentation about it, but probably you only need to compile with -ljemalloc. But you would give more info to help: what have you tried, what's happened....

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demon007 · 06-13-2012, 03:03 AM

Hi pan64,

thanks for your reply.

I have compiled jemalloc using the option --enabel-prof.

I am trying jemalloc in a small code which is allocating 1GB of memory. I tried to compile the code with -ljemalloc and it is working but the problem is that, it is not creating heap profile of the code.

I require to use the heap profiler that jemalloc has included in it but cant find any documentation regarding how to implement it.

pan64 · 06-13-2012, 03:23 AM

I found no other documentation, just the official one and this: https://bugzilla.mozilla.org/show_bug.cgi?id=627206. Probably it helps. You do not need to implement anything, just switch it on and look at the result.

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demon007 · 06-13-2012, 04:08 AM

Thanks it helped a lot.

And just for the record:
We have to compile jemalloc with --enable-prof.

The code in which jemalloc is to be used has to be compiled with -ljemalloc.

To create heap profiler, execute use the following command:

MALLOC_CONF=prof:true [command in which jemalloc has to be used]

pan64 · 06-13-2012, 04:29 AM

glad to hear that.
Probably you can ask them to release a much better documentation also.

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