[LLVMdev] Profiling in LLVM Patch Followup 1

[Andreas Neustifter]

Hi!

Daniel Dunbar wrote:
> 
> Sorry for the lag time...

No problem. As long as I know that you get to it sometime its fine for me...

> On Wed, Jul 22, 2009 at 5:47 AM, Andreas
> Neustifter<e0325716 at student.tuwien.ac.at> wrote:
>> Hi Daniel!
>>
>> Daniel Dunbar wrote:
>>> I merged in my changes to your patch, which results in the attached
>>> patch. There may be some missed merge errors. The main problem I have
>>> with the rest of this patch is that it causes a regression in
>>> llvm-prof's behavior. I tried running edge profiling on the
>>> MultiSource/Applications/aha benchmark in the llvm test-suite, and
>>> llvm-prof no longer prints any function information:
>>> --
>>> ddunbar at giles:aha$ opt -f Output/aha.linked.rbc -insert-edge-profiling -o foo.bc
>>> ddunbar at giles:aha$ llc foo.bc -o - | gcc -x assembler - -x none
>>> ~/llvm/Debug/lib/profile_rt.dylib
>>> ddunbar at giles:aha$ ./a.out
>>> ...
>>> ddunbar at giles:aha$ ~/llvm/Release/bin/llvm-prof foo.bc llvmprof.out
>>> [...]
>> First of all, you have to use the original bytecode file
>> (Output/aha.linked.bc) for use with llvm-prof like this:
>>
>> $ ~/llvm/Release/bin/llvm-prof Output/aha.linked.bc llvmprof.out
>>
>> Also you have to check that llvmprof.out is deleted between tests
>> otherwise the figures are accumulated counts from several runs.
> 
> Okay, I checked this in morning, and it seems ok. There is one quirk
> where the entry block to functions doesn't get a count, but I think
> that is cleaned up in a later patch.

Yes, there is tons of cleaning up in the later patches, all I know is that after the last patch I ran quite a few tests and this version runs very well.

> Can you regenerate the next patch in your sequence verse TOT and send
> it out again? Sorry, but I can't deal with all 8 at once -- I have to
> take them one at a time. :)

Of course! Here it comes, all new and shiny :-)

Andi
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