Messages in this thread | | | Date | Tue, 8 Mar 2016 18:57:53 +0100 | From | Ingo Molnar <> | Subject | Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer |
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* Ingo Molnar <mingo@kernel.org> wrote:
> Things got a lot more lively after that! > > But most of the overhead seems to come from systemd trying to dump core or > something like that: > > 85872 mingo 20 0 34712 3016 2656 S 4.6 0.0 0:00.14 systemd-coredum > 85440 mingo 20 0 34712 3028 2664 S 4.2 0.0 0:00.13 systemd-coredum > 85751 mingo 20 0 34712 3076 2716 S 4.2 0.0 0:00.13 systemd-coredum > 85840 mingo 20 0 34712 2988 2624 S 4.2 0.0 0:00.13 systemd-coredum > 85861 mingo 20 0 34712 3080 2720 S 4.2 0.0 0:00.13 systemd-coredum > 85954 mingo 20 0 34712 3028 2664 S 4.2 0.0 0:00.13 systemd-coredum > > and I have: > > fomalhaut:~/go/src/github.com/google/syzkaller> ulimit -c > 0 > > weird ... Has any of you seen such behavior?
So the workaround for that is to disable systemd trying to log every core dump to the system journal (!), via:
echo > /proc/sys/kernel/core_pattern
Thanks,
Ingo
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