some other links for performance measurement

[Zubair Nawaz]

http://www.scribd.com/doc/54510623/63/Performance-Measurement

http://stackoverflow.com/questions/10155579/c-vs-opencl-how-to-compare-results-of-time-measurement

[Bilal Shahzad]

Sir,

Can we use following code, it is for C++?

clock_t t1, t2;
t1 = clock();
run function 1,000,000 times
t2 = clock()
float diff = ((float)t2 - (float)t1) / 1000000.0F;

I am unable to calculate time/performance using following code in opencl. Is anyone able to run this successfully?  It is returning same start and end time.

clGetEventProfilingInfo(prof_event, CL_PROFILING_COMMAND_START,
           sizeof(time_start), &time_start, NULL);
             clGetEventProfilingInfo(prof_event, CL_PROFILING_COMMAND_END,
                   sizeof(time_end), &time_end, NULL);
             total_time += time_end - time_start;

Thanks,

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From: Zubair Nawaz <zubair...@gmail.com>
To: pucit-...@googlegroups.com
Sent: Monday, 22 October 2012 1:10 PM
Subject: [M.Phil CS F11] some other links for performance measurement

http://www.scribd.com/doc/54510623/63/Performance-Measurement

http://stackoverflow.com/questions/10155579/c-vs-opencl-how-to-compare-results-of-time-measurement

[Sarwan dar]

God rays sample has a good method of calculating time elapsed since the beginning of the programme.I used that In my program.

Regards,

Sarwan Dar

[Bilal Shahzad]

Sarwan,

I could not find any such method there. Was sir fine with that method? Can you elaborate here if possible? Thanks

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From: Sarwan dar <sarw...@gmail.com>
To: pucit-...@googlegroups.com
Sent: Monday, 22 October 2012 7:34 PM
Subject: Re: [M.Phil CS F11] some other links for performance measurement

[Sarwan dar]

I think sir only wants us to measure the time of the application on a cpu as well as a gpu and wouldnt mind if we use any other method for that purpose.Many of the sample open cl applications use this method for performance measurement.

 

I have attached a sample project and you could use that code if you like.

This is how I did it. 

//for perf. counters
#include <Windows.h>
#include <conio.h>
#include <iostream>

LARGE_INTEGER g_PerfFrequency;
LARGE_INTEGER g_PerformanceCountNDRangeStart;
LARGE_INTEGER g_PerformanceCountNDRangeStop;

 

/*to be placed on top of the call
clenqueueNDrangekernel(which sets the work items and work groups per kernel)*/

 

 QueryPerformanceCounter(&g_PerformanceCountNDRangeStart);

 

/*to be placed before clenqueuereadbuffer(which reads the result of the output)*/

QueryPerformanceCounter(&g_PerformanceCountNDRangeStop);

 

/*After execution of the kernel this call can be placed anywhere in main to print*/

 

 QueryPerformanceFrequency(&g_PerfFrequency);
    printf("NDRange perf. counter time %f ms.\n", 1000.0f*(float)(g_PerformanceCountNDRangeStop.QuadPart - g_PerformanceCountNDRangeStart.QuadPart)/(float)g_PerfFrequency.QuadPart);

[Bilal Shahzad]

Thanks Sarwan. This is working :)

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From: Sarwan dar <sarw...@gmail.com>
To: pucit-...@googlegroups.com

Sent: Monday, 22 October 2012 8:53 PM