Date: Wed, 30 Nov 2016 21:30:57 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 214964] pmcstat -R with an empty sample file waits indefinitely Message-ID: <bug-214964-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D214964 Bug ID: 214964 Summary: pmcstat -R with an empty sample file waits indefinitely Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: bin Assignee: freebsd-bugs@FreeBSD.org Reporter: emaste@freebsd.org I would like to get an automated 1s sample of profiling data and output sam= pled calltraces with something like: timeout 1 pmcstat -P unhalted-cycles -t <pid> -O sample.out pmcstat -R sample.out -G /dev/stdout However, if sample.out is empty (because the process is sleeping, say), the second pmcstat waits indefinitely for data to appear in the sample.out file. % sleep 3600 & [1] 52998 % timeout 1 pmcstat -P unhalted-cycles -t 52998 -O sample.out % pmcstat -R sample.out -G /dev/stdout=20=20=20=20=20=20=20=20=20=20=20=20 load: 4.81 cmd: pmcstat 54160 [kqread] 1.19r 0.00u 0.00s 0% 2960k --=20 You are receiving this mail because: You are the assignee for the bug.=
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