[LLVMdev] LLVM profiling

[John Criswell]

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