Benchmarking C++ operators 2004-06-01 - By Daniel Bachler
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Well there is Intels Vtune, but it's quite expensive (although I think that
there is a trial version available) and it can be a bit tough to set up so
that it returns some usefull information. MSVC has some kind of profiler of
its own IIRC, but without any graphical representation or anything fancy.
And, last but not least, you can of course take timestamps yourself
everytime you operator gets called and everytime it returns and measuring
that time. If it's something simple I would first try the last trick, it's
quite fast to setup and very precise, as the time you loose on profiling is
really negligible. If you want to take it a step further you can store an
array of simple structures containing last starttime and amount of time in
that block, then write two small function, like this: (C++ style pseudocode)
Void StartBlock(int blockIndex)
{
m_ProfilerStructures[blockIndex].m_Starttime = gettime();
}
Void EndBlock(int blockIndex)
{
m_ProfilerStructures[blockIndex].m_ElapsedTime += gettime() -
m_ProfilerStructures[blockIndex].m_Startime();
}
You can then use it like this:
StartBlock(INIT);
Initialize();
EndBlock(INIT);
StartBlock(MAIN);
DoStruff();
EndBlock(MAIN);
Daniel
> -- --Original Message-- --
> From: owner-xsi@(protected)
> [mailto:owner-xsi@(protected)] On Behalf Of Felix Gebhardt
> Sent: Tuesday, June 01, 2004 2:22 PM
> To: XSI@(protected)
> Subject: Benchmarking C++ operators
>
> Hi all,
>
> does anyone happen to have an advise on what's the best way
> to benchmark
> compiled operators? In VBS I just would take a time snapshot
> but it's not
> too precise. How to nail it down better in C++? Any simple
> but precise way
> or free and easy to use analyzer/profiler?
>
> Suggestions greatly appreciated,
> Felix
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