llvm dev - Jul 2017 - Obtain the execution time of one specified library function, such as CUDA library function.

Hi LLVM-ers,

I want to obtain the execution time of one specified library function, such
as CUDA library function.

My thoughts is: 1) use clang to compile the library function to IR;
                         2) instrument the IR, here is my unknown. I have
no idea about how to instrument the instruction relative to execution time.
Or is this approach feasible? If there is function supporting timestamp, I
want to insert the start-time timestamp to the begin of the library
function, and insert the stop-time timestamp to the end of the library
function, then compute the interval between two timestamp.

Thanks!
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Sounds like this:
https://clang.llvm.org/docs/UsersManual.html#profiling-with-instrumentation
might
be relevant to your interests. Though I'm not sure there's a supported
way
to /only/ collect a profile for a single function.

On Thu, Jul 6, 2017 at 8:20 PM 李阳 via llvm-dev <llvm-dev at
lists.llvm.org>
wrote:
> Hi LLVM-ers,
>
> I want to obtain the execution time of one specified library function,
> such as CUDA library function.
>
> My thoughts is: 1) use clang to compile the library function to IR;
>                          2) instrument the IR, here is my unknown. I have
> no idea about how to instrument the instruction relative to execution time.
> Or is this approach feasible? If there is function supporting timestamp, I
> want to insert the start-time timestamp to the begin of the library
> function, and insert the stop-time timestamp to the end of the library
> function, then compute the interval between two timestamp.
>
> Thanks!
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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