Well, Thanks! after try this: set_autopthread_targ(2); set_autopthread_size(0); perl.exe takes 60% CPU time now, its trying to make use of both core now. But total exec time is 52sec, 2 sec longer. I will look detial into ParallelCPU. html and Core.html a little later.. Maybe my code is not suitable for 2x accelerating? BTW is there any typical PDL sample code that is suitable for multicore accelerating?
Xiaofang. On Fri, Mar 28, 2014 at 9:35 PM, Ingo Schmid <[email protected]> wrote: > > Hi, > > maybe you are looking for this? > > http://pdl.perl.org/PDLdocs/ParallelCPU.html > > Ingo > > > On 03/28/2014 02:07 PM, vine xf wrote: > > Thanks, After modify perldl.conf and rebuilding, my PDL is linked with > pthread now. > The site/lib/auto/PDL/Core.dll is bigger and depends on pthreadVC2.dll. > But hopelessly, > my script is not any faster at all. I'm using a laptop with ATOM N280 > Cpu, 2 core. My > PDL perl scripts use to run up to 50% cpu load, i.e. using only one core. > After I shifted > to the new pthread version, it still runs still at 50% load, takes same > time to run. My script > is doing some image signal processing jobs, include Pdlpp inline code, and > apply to a > 2M-pixel matrix. Why after enalbing pthread, it still runs on single core? > > On Wed, Mar 26, 2014 at 4:28 PM, <[email protected]> wrote: > >> >> From: vine xf >> >> >> Thanks so much. For my ActiverPerl 5.16, since I installed it from AP516 >>> source code using VC++6, I guess may be the pre-build pdl ppm is not a >>> choice in my case. >>> >> >> Yes - if you've built perl from source, then I don't think you'll have >> PPM. >> (We could probably track down a version of PPM that's usable for you if >> you wanted - for example, the version that ships with recent builds of >> Strawberry Perl is quite serviceable. But you're obviously fairly >> comfortable with VC++ 6.0, so why not see how far we can get using it.) >> >> >> So how to install PDL with pthread manually? >>> I found a pthread-win32 on http://sourceware.org/pthreads-win32/ What's >>> the correct way to setup all these pieces. I mean, whether shall I >>> reinstall active perl first, or just tweak with perldl.conf to enable >>> pthread features? >>> >> >> No need to rebuild perl - but you *will* need to rebuild PDL. >> And yes, if you tweak perldl.conf to point to the pthreads header and >> library, then that should build PDL with pthreads enabled. >> The 'perl Makefile.PL' step should tell you whether it's going to build >> PDL with or without pthreads - so keep an eye on that output. If it says >> it's not enabling pthreads, then that probably means that you haven't >> tweaked perldl.conf correctly. >> >> I haven't personally tried to build pthreads-enabled PDL using a >> Microsoft compiler. >> I've built PDL using a few Microsoft compilers (including VC++ 6.0), but >> not with pthreads support. >> Let us know if you strike trouble - we might be able to help you out ( >> .... or might not ;-) >> >> Cheers, >> Rob >> > > > > _______________________________________________ > Perldl mailing > [email protected]http://mailman.jach.hawaii.edu/mailman/listinfo/perldl > > > > _______________________________________________ > Perldl mailing list > [email protected] > http://mailman.jach.hawaii.edu/mailman/listinfo/perldl > >
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