Search found 5 matches

by Jackie Lee
2017-09-14T23:45:32-07:00
Forum: Bugs
Topic: Possible bug: GetMagickInfo is really slow in 6.9.9
Replies: 2
Views: 4138

Re: Possible bug: GetMagickInfo is really slow in 6.9.9

It seems that is not a bug. The IM 6.9.9 configured with "--enable-shared --with-modules" is much faster than "--enable-static". Now I want to know how to make the static IM as fast as shared one.
by Jackie Lee
2017-09-14T00:36:35-07:00
Forum: Bugs
Topic: Possible bug: GetMagickInfo is really slow in 6.9.9
Replies: 2
Views: 4138

Possible bug: GetMagickInfo is really slow in 6.9.9

I go on my test and find that IM6.9.9 is much slower than IM6.7.2. I do nothing but read a jpeg image from memory and destory it with 7-threads. It seems that IM6.9.9 would use much more time in GetMagickInfo() so that the Semaphore Lock would occupy more time. The following code would use almost 70...
by Jackie Lee
2017-09-12T19:59:08-07:00
Forum: Bugs
Topic: Possible bug: CPU usage drop down after a long time running in multi-threads situation
Replies: 3
Views: 5013

Re: Possible bug: CPU usage drop down after a long time running in multi-threads situation

I found the bug now. A thread safe issue in MagickWand/wand.c. WandExport size_t AcquireWandId(void) { static size_t id = 0; if (wand_semaphore == (SemaphoreInfo *) NULL) ActivateSemaphoreInfo(&wand_semaphore); LockSemaphoreInfo(wand_semaphore); if (wand_ids == (SplayTreeInfo *) NULL) wand_ids=N...
by Jackie Lee
2017-09-11T03:15:58-07:00
Forum: Bugs
Topic: Possible bug: CPU usage drop down after a long time running in multi-threads situation
Replies: 3
Views: 5013

Possible bug: CPU usage drop down after a long time running in multi-threads situation

When using the 7 threads in a 24 cores machine, the CPU usage would become really low after running a long time. It is about 400% at first, could become 200% in the final. Here is my test program, I run it in CentOS 6.5 several times and the problem occured everytime. the ImageMagick version is 6.9....