llvm dev - May 2015 - [LLVMdev] LLVM profiling

Hi guys,

I am trying to perform edge profiling using on hello.bc file by using
following command

opt -insert-edge-profiling hello.bc -o hello-edge.bc

but I get the error that option "-insert-edge-profiling" is unknown.
Can
you please help me to solve the issue. Please note that I am following the
paper available at this link
http://llvm.org/pubs/2010-12-Preuss-PathProfiling.pdf

Thanks

Naveed Ul Mustafa

Dear Naveed,

Have you verified that edge profiling was integrated into LLVM? This 
paper applies a patch to an older version of LLVM to add the edge 
profiling feature, so it looks like edge profiling wasn't integrated 
into LLVM at that time.  It's not clear to me whether it was added after 
the paper was published and whether that feature still exists.

A simple grep on trunk does not show an LLVM pass providing the 
insert-edge-profiling command line option.  A quick Google search shows 
something like an edge profiling pass in LLVM 3.3 
(https://llvm.org/svn/llvm-project/llvm/branches/release_33/lib/Transforms/Instrumentation/OptimalEdgeProfiling.cpp),
but I don't see that code in LLVM trunk now.

I don't use LLVM's profiling features myself.  Other people that work on
the profiling code can better tell you whether edge profiling exists in 
LLVM now or existed in a previous version.  If you don't hear from 
anyone within the next few days, please start a new thread on the 
mailing list with a subject of "Edge Profiling Support" (a more
specific
thread title can sometimes elicit more responses).

Regards,

John Criswell

On 5/25/15 3:08 PM, Naveed Ul Mustafa wrote:
> Hi guys,
>
> I am trying to perform edge profiling using on hello.bc file by using
> following command
>
> opt -insert-edge-profiling hello.bc -o hello-edge.bc
>
> but I get the error that option "-insert-edge-profiling" is
unknown. Can
> you please help me to solve the issue. Please note that I am following the
> paper available at this link
> http://llvm.org/pubs/2010-12-Preuss-PathProfiling.pdf
>
> Thanks
>
> Naveed Ul Mustafa
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

-- 
John Criswell
Assistant Professor
Department of Computer Science, University of Rochester
http://www.cs.rochester.edu/u/criswell

It is currently done in Clang FE: tools/clang/lib/CodeGen/CodeGenPGO.cpp --
CodeGenPGO::assignRegionCounters(..)

David


On Tue, May 26, 2015 at 7:34 AM, John Criswell <jtcriswel at gmail.com>
wrote:
> Dear Naveed,
>
> Have you verified that edge profiling was integrated into LLVM? This paper
> applies a patch to an older version of LLVM to add the edge profiling
> feature, so it looks like edge profiling wasn't integrated into LLVM at
> that time.  It's not clear to me whether it was added after the paper
was
> published and whether that feature still exists.
>
> A simple grep on trunk does not show an LLVM pass providing the
> insert-edge-profiling command line option.  A quick Google search shows
> something like an edge profiling pass in LLVM 3.3 (
>
https://llvm.org/svn/llvm-project/llvm/branches/release_33/lib/Transforms/Instrumentation/OptimalEdgeProfiling.cpp),
> but I don't see that code in LLVM trunk now.
>
> I don't use LLVM's profiling features myself.  Other people that
work on
> the profiling code can better tell you whether edge profiling exists in
> LLVM now or existed in a previous version.  If you don't hear from
anyone
> within the next few days, please start a new thread on the mailing list
> with a subject of "Edge Profiling Support" (a more specific
thread title
> can sometimes elicit more responses).
>
> Regards,
>
> John Criswell
>
>
> On 5/25/15 3:08 PM, Naveed Ul Mustafa wrote:
>
>> Hi guys,
>>
>> I am trying to perform edge profiling using on hello.bc file by using
>> following command
>>
>> opt -insert-edge-profiling hello.bc -o hello-edge.bc
>>
>> but I get the error that option "-insert-edge-profiling" is
unknown. Can
>> you please help me to solve the issue. Please note that I am following
the
>> paper available at this link
>> http://llvm.org/pubs/2010-12-Preuss-PathProfiling.pdf
>>
>> Thanks
>>
>> Naveed Ul Mustafa
>>
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>
>
>
> --
> John Criswell
> Assistant Professor
> Department of Computer Science, University of Rochester
> http://www.cs.rochester.edu/u/criswell
>
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
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On 05/26/15 10:34, John Criswell wrote:
>
> I don't use LLVM's profiling features myself.  Other people that
work
> on the profiling code can better tell you whether edge profiling 
> exists in LLVM now or existed in a previous version.  If you don't 
> hear from anyone within the next few days, please start a new thread 
> on the mailing list with a subject of "Edge Profiling Support" (a
more
> specific thread title can sometimes elicit more responses).
That's correct.  There is no edge profiling implementation in LLVM at 
this time.


Diego.

"Naveed Ul Mustafa" <naveed.mustafa at bilkent.edu.tr>
writes:
> Hi guys,
>
> I am trying to perform edge profiling using on hello.bc file by using
> following command
>
> opt -insert-edge-profiling hello.bc -o hello-edge.bc
This flag has been gone since 2013 or so. The profiling infrastructure
this was part of was removed because it was unmaintained and getting in
the way of newer PGO efforts.

There is some information about PGO with today's clang in the user manual:

  http://clang.llvm.org/docs/UsersManual.html#profile-guided-optimization
> but I get the error that option "-insert-edge-profiling" is
unknown. Can
> you please help me to solve the issue. Please note that I am following the
> paper available at this link
> http://llvm.org/pubs/2010-12-Preuss-PathProfiling.pdf
>
> Thanks
>
> Naveed Ul Mustafa
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev