libjpeg thread safe constraint is not must
yzh杨振宏 <[email protected]>
| Newsgroups | gmane.comp.video.graphicsmagick.help |
|---|---|
| Message-ID | <7354BE8391D7C34B9384A115F0B5444A209F5EBC@SVR2115HP380.cn1.global.ctrip.com> |
Hi，Bob， We find GraphicsMagick doesn't work well if the program self is multi thread. This is almost certainly because the JPEG coder has been marked as not thread safe. e.g., entry->thread_support=False; /* libjpeg is not thread safe */ We experiment by removing this constraint and see apparent performance improvement. Note that the thread safe assumption is not must for JPEG_LIB_VERSION >= 80 and LIBJPEG_TURBO_VERSION, and ImageMagick has remove the constraint since 6.8.9-8 in Sep 2014. See: https://www.imagemagick.org/discourse-server/viewtopic.php?f=2&t=25495 Could GM remove this constraint in next release to benefit whole community, as many people will use GM in multi-thread scenario like us as an image http server. Best regards. zhyang ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Graphicsmagick-help mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/graphicsmagick-help