Ok, thanks. and sorry for this "off topic" noise. AlicVB Le 25/11/2012 02:55, johannes hanika a écrit : > even though the threads are most likely held idle in the background > and not created new for every openmp loop, there will be an overhead > starting a parallel section. > > plus, if your loop doesn't scale well, all threads have to wait for > the slowest one, so you'll get synchronization overhead (likely cause > might be the content of your loop is not enough work). > > as a reference, the border loops process about the same amount of work > as the finest grain work packet used to parallelize the rest.. > > j. > > > > On Sun, Nov 25, 2012 at 9:46 AM, AlicVB <[email protected]> wrote: >> Hi all, >> >> I have a question about OpenMP statement. >> While playing with that module, I find that borders doesn't use OpenMP >> in his process routine. I have tried to add some OpenMP statements, >> especially for the image blitting loop, at the end of the process, but >> perfs are worth... >> I understand it's not a big deal, but if someone with openmp skill can >> explain me why... >> >> Thanks in advance. >> >> AlicVB >> >> >> ------------------------------------------------------------------------------ >> Monitor your physical, virtual and cloud infrastructure from a single >> web console. Get in-depth insight into apps, servers, databases, vmware, >> SAP, cloud infrastructure, etc. Download 30-day Free Trial. >> Pricing starts from $795 for 25 servers or applications! >> http://p.sf.net/sfu/zoho_dev2dev_nov >> _______________________________________________ >> darktable-devel mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/darktable-devel
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