Date: Fri, 25 Nov 2022 00:10:15 +0000 From: bugzilla-noreply@freebsd.org To: apache@FreeBSD.org Subject: [Bug 266873] www/apache24: creating forked processes at 100% CPU spinning in sched_yield() Message-ID: <bug-266873-16115-8u6D65m3Zu@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-266873-16115@https.bugs.freebsd.org/bugzilla/> References: <bug-266873-16115@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D266873 Eero H=C3=A4nninen <fax@nohik.ee> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |fax@nohik.ee --- Comment #7 from Eero H=C3=A4nninen <fax@nohik.ee> --- This issue seems to be related with libomp and Imagemagcik. I have faced sa= me problem with php-fpm. Php-fpm master process takes 100% cpu and truss show = just endless sched_yield() =3D 0 (0x0) So I have removed OpenMP support from Imagemagcik and let poudriere recompi= le php-gd and php pecl-imagick extension. After that problem is gone. As far a= s I tested, this libomp problem presents in 13.1-RELEASE and 13-STABLE, but not= in 13.0-RELEASE or even 12.2-RELEASE. This issue can be reproduce with Imagemagcik 6.x simply, take jpg format picture about 600kb or larger size and execute: convert -bench 40 image.jpg -sharpen 0x1 null: And watch this process with truss. If Imagemagcik is compiled with OpenMP support then sooner or later you will see: sched_yield() =3D 0 (0x0) and I dont know is this process come to end or not. without OpenMP support process completes fast and there is no sched_yield() loop. Another note, seems that pecl-imagcik Readme file has extra section for Imagemagcik and OpenMP implementations: https://github.com/Imagick/imagick/blob/master/README.md Hope this helps. --=20 You are receiving this mail because: You are the assignee for the bug.=
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