-----Original Message----- From: Kai-Uwe Behrmann [mailto:k...@gmx.de] Sent: 22. februar 2010 11:14 To: Esben Høgh-Rasmussen Cc: Lcms Liste Subject: Re: [Lcms-user] Problems with non-perceptual intents in LCMS2
Am 22.02.10, 11:08 +0100 schrieb Esben Høgh-Rasmussen: >> Just another quick question (or maybe a feature request): is there a >> safe way to apply a transform from several threads without locking? > > Oyranos threads a lcms colour conversion over OpenMP quite well. Hi, OpenMP can help, but we normally get a lot more out of doing things by hand. Last week we had a case where disabling OpenMP improved performance by a factor of 25 on a 16-core computer in a part of out application. In this particular case, OpenMP is not an option since the processing is already handled in threads. While I admit I did not test it, I doubt OpenMP is able to do better than calling LCMS in native threads. As far as I can see the locking affected by CMS_DONT_USE_PTHREADS is quite minimal. Thank you for your input; it could help a lot if you start from a non-threaded app. Regards, Esben Høgh-Rasmussen Myosotis Software Engineer Phase One A/S Roskildevej 39 DK-2000 Frederiksberg Denmark Phone: + 45 36 13 12 07 Fax.: + 45 36 46 02 22 Mobile: + 45 28 51 10 79 E-mail: e...@phaseone.com www.phaseone.com ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
