A couple years ago, a few of us worked on adding multi-threading
support to key routines in PIL - focusing on the ones that would most
likely be CPU intensive or long duration operations. It's a simple
fix to release the GIL before starting the op, and re-acquire before
returning - look at the C code for resize, for example. We didn't
get it implemented everywhere, but many of the "expensive" operations
are now covered. I'm sure Fred would gladly accept patches to add
support elsewhere.
Kevin.
On 12 Dec 2008, at 11:34, Michael van Tellingen wrote:
Hello,
I'm currently writing a webapplication which processes images uploaded
by users and i'm running into two problems:
- Converting a CMYK jpeg image to RGB results in the wrong colors
used, i've solved this by patching PIL with the
file attached to
http://mail.python.org/pipermail/image-sig/2006-April/003871.html
- It seems that writing a PNG image requires the GIL. I convert all
uploaded images in a separate thread to PNG
images and while doing so my complete python application becomes
really slow, I don't have this problem when
I convert it to JPEG or TIFF. Is this correct? And if so, how hard
would it be to solve this problem?
Thanks,
Michael van Tellingen
_______________________________________________
Image-SIG maillist - Image-SIG@python.org
http://mail.python.org/mailman/listinfo/image-sig
_______________________________________________
Image-SIG maillist - Image-SIG@python.org
http://mail.python.org/mailman/listinfo/image-sig
