[LLVMdev] Profiling LLVM JIT code

[Priyendra Deshwal]

Thanks for the info. I am using old JIT. So that should not be a problem.

I will take a look at using oprofile. I have never used it - so will be
somewhat of a learning curve.

I notice that the configure script has a --with-oprofile option. In
addition to enabling that, is there something else that also needs to be
done? My copy of LLVM is compiled with --enable-optimized. Will
--with-oprofile work fine with that or should I disable optimized?

Regards,
-- Priyendra

On Mon, Mar 4, 2013 at 11:54 AM, Kaylor, Andrew <andrew.kaylor at intel.com>wrote:

>  Hi Priyendra,****
>
> ** **
>
> There is support for oprofile and Intel® VTune™ Performance Analyzer, but
> either one needs to be explicitly turned on during the build process.  If
> you use MCJIT (as opposed to the older JIT) then oprofile support isn’t in
> place yet.****
>
> ** **
>
> Both of these work by providing a JITEventListener that receives
> notification when new code is emitted and hooks it up to the profiling tool
> via some tool-specific notification API.  I’m not familiar with pprof, but
> it probably wouldn’t be very difficult to write a new event listener to add
> support for pprof.****
>
> ** **
>
> You can find the oprofile code in ‘llvm/lib/ExecutionEngine/OProfileJIT’
> to use as an example.****
>
> ** **
>
> -Andy****
>
> ** **
>
> *From:* llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] *On
> Behalf Of *Priyendra Deshwal
> *Sent:* Sunday, March 03, 2013 3:11 AM
> *To:* llvmdev at cs.uiuc.edu
> *Subject:* [LLVMdev] Profiling LLVM JIT code****
>
> ** **
>
> Hey guys,****
>
> ** **
>
> I am currently working on a project that uses JIT compilation to compile
> incoming user requests to native code. Are there some best practises
> related to profiling the generated code?****
>
> ** **
>
> My project uses gperftools pprof for profiling etc. Is there a way to hook
> the two up? Are there any other profiling method that works? This page
> describes how to debug JIT code with GDB. I wonder if something similar
> could be done for gperftools/pprof?****
>
> ** **
>
> Regards,****
>
> -- Priyendra****
>
> ** **
>
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