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Re: Measure Performance via QueryPerformanceCounter [message #41712]

Mon, 22 November 2004 07:11

supaey2000
Messages: 2
Registered: November 2004

Junior Member

Thank you Ken and David for your help.

The PROFILER procedure was what I was looking for and I will use it in
future.
The resolution of Systime (/seconds) was not accurate enough to allow
measurements of the required time for 5 or 6 IDL commands within one
procedure.

The QueryPerformanceCounter still helped me for this.
It worked quite good with the C-Code Library IDL_Tools from Randall
Frank for IDL 5.6 (http://www.kilvarock.com/freesoftware/dlms/randallfrank.htm),
since Call_External can't handle "normal" paramters.
I give an short example for someone who needs to call kernel32.dll
functions.

err = EXTPROC_DEFINE('QueryPerformanceCounter','kernel32.dll','Que ryPerformanceCounter','l(p)')
err = EXTPROC_DEFINE('QueryPerformanceFrequency','kernel32.dll','Q ueryPerformanceFrequency','l(p)')

a=[0ll]
b=[0ll]
c=[0ll]
ret=QueryPerformanceFrequency(a)
ret=QueryPerformanceCounter(b)

for i=0,10 do print, 'Performance Test'
ret=QueryPerformanceCounter(c)

print, 'Time required: ' + strtrim(string((c-b)/double(a)),2) + '
Seconds'

Thank you,

Daniel

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[Message index]

		Re: Measure Performance via QueryPerformanceCounter By: supaey2000 on Mon, 22 November 2004 07:11
		Re: Measure Performance via QueryPerformanceCounter By: dszlucha@gmail.com on Sat, 20 November 2004 14:59
		Re: Measure Performance via QueryPerformanceCounter By: KM on Sat, 20 November 2004 07:20

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