Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.kernel > #1353266
| From | Ingo Molnar <mingo@kernel.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer |
| Date | 2016-03-08 18:50 +0100 |
| Message-ID | <ratVI-47w-79@gated-at.bofh.it> (permalink) |
| References | (5 earlier) <ratiV-3LD-7@gated-at.bofh.it> <ratCi-3TL-11@gated-at.bofh.it> <ratCj-3TL-29@gated-at.bofh.it> <ratLZ-40W-37@gated-at.bofh.it> <ratVF-47w-21@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
* Dmitry Vyukov <dvyukov@google.com> wrote: > On Tue, Mar 8, 2016 at 6:37 PM, Ingo Molnar <mingo@kernel.org> wrote: > > > > * Dmitry Vyukov <dvyukov@google.com> wrote: > > > >> > fomalhaut:~/go/src/github.com/google/syzkaller> ps aux | grep -i syz > >> > mingo 1374 0.0 0.0 118476 2376 pts/2 S+ 18:23 0:00 grep --color=auto -i syz > >> > > >> > and with no kernel messages in dmesg - and with a fully functional system. > >> > > >> > I'm running the 16-task load on a 120 CPU system - should I increase it to 120? > >> > Does the code expect to saturate the system? > >> > >> No, it does not expect to saturate the system. Set "procs" to 480, or > >> something like that. > > > > Does not seem to help much: > > > > fomalhaut:~> vmstat 10 > > procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu----- > > r b swpd free buff cache si so bi bo in cs us sy id wa st > > > > 1 0 0 257465904 219940 4736092 0 0 0 102 16022 4396 0 1 99 0 0 > > 2 0 0 257452144 220496 4755052 0 0 2 3649 14286 4627 0 1 99 0 0 > > 2 0 0 257473408 221188 4770824 0 0 15 1898 17175 4474 0 1 99 0 0 > > > > Only around 1% system utilization. Should I go for 1,000 or more? :) > > > > Peter, do you experience with running syz-kaller on larger CPU count Intel > > systems? > > > Try to set "dropprivs": false in config. 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? Thanks, Ingo
Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
[RESEND PATCH 0/5] perf core: Support overwrite ring buffer Wang Nan <wangnan0@huawei.com> - 2016-03-07 05:00 +0100
[RESEND PATCH 5/5] perf core: Reduce perf event output overhead by new overflow handler Wang Nan <wangnan0@huawei.com> - 2016-03-07 05:00 +0100
[RESEND PATCH 4/5] perf core: Add backward attribute to perf event Wang Nan <wangnan0@huawei.com> - 2016-03-07 05:00 +0100
[RESEND PATCH 3/5] perf core: Prepare writing into ring buffer from end Wang Nan <wangnan0@huawei.com> - 2016-03-07 05:00 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Peter Zijlstra <peterz@infradead.org> - 2016-03-08 14:50 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Ingo Molnar <mingo@kernel.org> - 2016-03-08 14:50 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Peter Zijlstra <peterz@infradead.org> - 2016-03-08 15:00 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Ingo Molnar <mingo@kernel.org> - 2016-03-08 16:30 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Dmitry Vyukov <dvyukov@google.com> - 2016-03-08 16:40 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Ingo Molnar <mingo@kernel.org> - 2016-03-08 17:00 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Dmitry Vyukov <dvyukov@google.com> - 2016-03-08 17:20 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Ingo Molnar <mingo@kernel.org> - 2016-03-08 17:30 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Dmitry Vyukov <dvyukov@google.com> - 2016-03-08 17:40 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Peter Zijlstra <peterz@infradead.org> - 2016-03-08 17:40 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Ingo Molnar <mingo@kernel.org> - 2016-03-08 17:50 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Ingo Molnar <mingo@kernel.org> - 2016-03-08 17:50 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Dmitry Vyukov <dvyukov@google.com> - 2016-03-08 18:10 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Ingo Molnar <mingo@kernel.org> - 2016-03-08 18:30 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Dmitry Vyukov <dvyukov@google.com> - 2016-03-08 18:30 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Ingo Molnar <mingo@kernel.org> - 2016-03-08 18:40 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Dmitry Vyukov <dvyukov@google.com> - 2016-03-08 18:50 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Ingo Molnar <mingo@kernel.org> - 2016-03-08 18:50 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Peter Zijlstra <peterz@infradead.org> - 2016-03-08 19:00 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Ingo Molnar <mingo@kernel.org> - 2016-03-08 19:00 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Ingo Molnar <mingo@kernel.org> - 2016-03-08 19:10 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Ingo Molnar <mingo@kernel.org> - 2016-03-08 19:30 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Ingo Molnar <mingo@kernel.org> - 2016-03-08 19:40 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Dmitry Vyukov <dvyukov@google.com> - 2016-03-08 19:00 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Peter Zijlstra <peterz@infradead.org> - 2016-03-08 19:00 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Peter Zijlstra <peterz@infradead.org> - 2016-03-08 17:40 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Borislav Petkov <bp@alien8.de> - 2016-03-09 12:00 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Dmitry Vyukov <dvyukov@google.com> - 2016-03-09 12:30 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Jiri Olsa <jolsa@redhat.com> - 2016-03-08 21:00 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Peter Zijlstra <peterz@infradead.org> - 2016-03-08 21:10 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Jiri Olsa <jolsa@redhat.com> - 2016-03-08 21:50 +0100
Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Peter Zijlstra <peterz@infradead.org> - 2016-03-08 22:10 +0100
csiph-web