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Re: Intel iMac IDL performance [message #47930 is a reply to message #47652]

Mon, 13 March 2006 09:59

Wolf Schweitzer
Messages: 21
Registered: October 2001

Junior Member

JD Smith wrote:
> This assumes TPOOL_MIN_ELTS=100000. Setting tpool_min_elts with CPU will
> reset this, which will make the size of the vector much smaller, and make
> this somewhat artificial (though I don't doubt a factor of 10, really). I
> guess I should have put a:
>
> cpu,tpool_min_elts=100000
>
> first, to even the playing field.
>
> JD

I did set the vector to 100000 (which rids me of depending on that
assumption with the threadpool minimal elements - setting being constant).

Then I vary TPOOL_MIN_ELTS until I find the fastest speed. I personally
would see no point in recording an artificially slow speed just because
for a given machine / task, the TPOOL_MIN_ELTS is suboptimal. So you'd
first seek the best speed, and record that.

Below my "tweaked" version.

Regards, Wolf.

---

pro jdstest

cpu,/reset
a=randomu(sd,100L*!CPU.TPOOL_MIN_ELTS)
t=systime(1) & a=sqrt(a)/(a>0.5) & ri =systime(1)-t

print, 'initial result ', ri, ' @ tpool ', !cpu.tpool_min_elts

bs= double(5)
p = 100
pool=0

for n = 0.,30. do begin

cpu,tpool_min_elts=bs^n
p=100
for i = 1,32 do begin

a=randomu(sd,100L *100000) ;*!CPU.TPOOL_MIN_ELTS)
t=systime(1) & a=sqrt(a)/(a>0.5) & r =systime(1)-t

if r lt p then begin
print, ' found new optimum at ',r, ' seconds @ tpool_min_elts ',bs^n
p = r
pool=n
end

end

end

print, ' final results ', p, ' @ tpoolminelts ', bs^pool
print, ' performance gain through tweaking tpool variable : new jd test
runs at percentage of ', p/ri * 100., ' %'

end

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[Message index]

		Intel iMac IDL performance By: K. Bowman on Mon, 27 February 2006 13:09
		Re: Intel iMac IDL performance By: K. Bowman on Wed, 01 March 2006 06:44
		Re: Intel iMac IDL performance By: Richard French on Tue, 28 February 2006 14:53
		Re: Intel iMac IDL performance By: K. Bowman on Tue, 28 February 2006 13:25
		Re: Intel iMac IDL performance By: JD Smith on Tue, 28 February 2006 12:55
		Re: Intel iMac IDL performance By: JD Smith on Tue, 28 February 2006 09:07
		Re: Intel iMac IDL performance By: Wolf Schweitzer on Mon, 13 March 2006 09:59
		Re: Intel iMac IDL performance By: JD Smith on Mon, 20 March 2006 08:19

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