Benchmarking C++ operators 2004-06-01 - By Luc-Eric Rousseau
Back
right, QueryPerformanceCounter is what we
use for mesuring an operator's performance.
-- --Original Message-- --
From: owner-xsi@(protected) [mailto:owner-xsi@(protected)]On Behalf
Of Felix Gebhardt
Posted At: Tuesday, June 01, 2004 10:08 AM
Posted To: xsi
Conversation: Benchmarking C++ operators
Subject: Re: Benchmarking C++ operators
Hi Daniel, thanks for helping out,
I already had a look at VTune. Like you said. It's way overdosed for my
purpose and too expensive to setup. I will have a look at the MSVC option
but I also found something interesting on codeproject.
http://www.codeproject.com/cpp/precisetimer.asp
If there is anything else, keep em coming,
Felix
Daniel Bachler wrote:
> 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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