On 9/16/2011 1:42 AM, Sisyphus wrote:
----- Original Message ----- From: "chm" <[email protected]>
To: "Chris Marshall" <[email protected]>
Cc: <[email protected]>
Sent: Tuesday, September 13, 2011 9:01 PM
Subject: Re: [Perldl] auto pthread performance gain
Running the :hisreswallclock version of t/pthread_auto.t
on the original Athlon X2 Dual Core machine with the
'$a **= 1.3' operation now shows a 2X speedup as hoped...
The current test uses '$a += 1' and '$b += 1' as the
computations. That is all memory and no computation.
If you edit to use a more expensive operation like
'$a **= 1.3' and '$b **= 1.3' you'll see more of a
win.
--Chris
Also running an Athlon (64) X2 Dual Core processor, using the current
git version of pthread_auto.t I get :
######################################
C:\sisyphusion\PDL>perl -Mblib t/pthread_auto.t
1..26
Benchmark: timing 50 iterations of threaded...
threaded: 0.826371 wallclock secs ( 1.38 usr + 0.11 sys = 1.49 CPU) @
33.67/s (n=50)
(warning: too few iterations for a reliable count)
ok 1
Benchmark: timing 50 iterations of unthreaded...
unthreaded: 0.923811 wallclock secs ( 0.91 usr + 0.00 sys = 0.91 CPU) @
55.19/s (n=50)
(warning: too few iterations for a reliable count)
########################################
Is that good ?
It doesn't look very good to me, but maybe I misunderstand something.
Cheers,
Rob
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