| Re: IDLSpecII and beyond [message #19467] |
Thu, 23 March 2000 00:00 |
Martin Schultz
Messages: 515
Registered: August 1997
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Senior Member |
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"J.D. Smith" wrote:
>
>
> 2. Bring in more relevant routines.. the real work horses that people are
> using, and whose speed they really care about. You can use:
> IDL> profiler, /RESET, /SYSTEM
> IDL> my_slow_routine_which_runs_overnight
> IDL> profiler, /REPORT
> and look for the most heavily used and slowest system (S) routines. Up to know,
> we've been testing: basic array math, shift(), randomu(), ludc(), transpose(),
> alog(), fft(), and smooth().
>
>
> I would appreciate any comments people have about the ingredients of an updated
> IDL speed test suite which are indispensable.
>
> Thanks,
>
> JD
>
Hi J.D.,
personally, I would like to see (1) a map test (e.g. the program
attached) and
(2) a contour test. Other things I use a lot are WHERE and
array-extraction operations.
Perhaps one should test scalability as well, for example:
pro wheretest
; test combination of where function and array extraction
; 1. small array size
m = findgen(100,100)
t0 = systime(1)
for i=0L,100 do begin
w = where(m gt 100 AND m lt 1000)
sub = m[w]
endfor
t1 = systime(1)
; 2. small array size
m = findgen(8000,4000)
t2 = systime(1)
for i=0L,3 do begin
w = where(m gt 100 AND m lt 1000)
sub = m[w]
endfor
t3 = systime(1)
print,'WHERE test : small array(100,100)*100 = '+string(t1-t0)+' s'
print,' large array(8000,4000)*3 = '+string(t3-t2)+' s'
end
On my machine (Dual Pentium III 500 MHz, Matrox Millenium 400, 1GB
Memory, Suse Linux 6.3), I achieve the following results for these
tests:
MAPDEMO (100 cycles) : 11.092647 s
WHERE test : small array(100,100)*100 = 0.064938068 s
large array(8000,4000)*3 = 13.678791
s
Cheers,
Martin
--
[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[ [[[[[[[
[[ Dr. Martin Schultz Max-Planck-Institut fuer Meteorologie [[
[[ Bundesstr. 55, 20146 Hamburg [[
[[ phone: +49 40 41173-308 [[
[[ fax: +49 40 41173-298 [[
[[ martin.schultz@dkrz.de [[
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