From: Jiri Olsa <jolsa@redhat.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: acme@kernel.org, peterz@infradead.org, jolsa@kernel.org,
mingo@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: Add top down metrics to perf stat
Date: Mon, 16 May 2016 14:58:38 +0200 [thread overview]
Message-ID: <20160516125838.GD10877@krava> (raw)
In-Reply-To: <1463190297-17408-1-git-send-email-andi@firstfloor.org>
On Fri, May 13, 2016 at 06:44:49PM -0700, Andi Kleen wrote:
SNIP
>
> The formulas to compute the metrics are generic, they
> only change based on the availability on the abstracted
> input values.
>
> The kernel declares the events supported by the current
> CPU and perf stat then computes the formulas based on the
> available metrics.
>
>
> Example output:
>
> $ perf stat --topdown -I 1000 cmd
> 1.000735655 frontend bound retiring bad speculation backend bound
> 1.000735655 S0-C0 2 47.84% 11.69% 8.37% 32.10%
> 1.000735655 S0-C1 2 45.53% 11.39% 8.52% 34.56%
you've lost first 3 header lines (time/core/cpus):
[jolsa@ibm-x3650m4-01 perf]$ sudo ./perf stat --per-core -e cycles -I 1000 -a
# time core cpus counts unit events
1.000310344 S0-C0 2 3,764,470,414 cycles
1.000310344 S0-C1 2 3,764,445,293 cycles
1.000310344 S0-C2 2 3,764,428,422 cycles
also I'm still getting -0% as I mentioned in my previous comment:
[jolsa@ibm-x3650m4-01 perf]$ sudo ./perf stat --topdown -I 1000 -a
nmi_watchdog enabled with topdown. May give wrong results.
Disable with echo 0 > /proc/sys/kernel/nmi_watchdog
1.001615409 retiring bad speculation frontend bound backend bound
1.001615409 S0-C0 2 38.3% 0.0% 58.4% 3.3%
1.001615409 S0-C1 2 38.1% -0.0% 59.3% 2.6%
1.001615409 S0-C2 2 38.1% 0.0% 58.9% 2.9%
1.001615409 S0-C3 2 38.1% -0.0% 58.9% 3.0%
1.001615409 S0-C4 2 38.0% 0.0% 59.0% 2.9%
1.001615409 S0-C5 2 38.1% -0.0% 58.6% 3.3%
1.001615409 S1-C0 2 49.7% 1.9% 44.7% 3.7%
thanks,
jirka
next prev parent reply other threads:[~2016-05-16 12:58 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-14 1:44 Add top down metrics to perf stat Andi Kleen
2016-05-14 1:44 ` [PATCH 1/8] x86/topology: Add topology_max_smt_threads() Andi Kleen
2016-05-14 1:44 ` [PATCH 2/8] perf/x86: Support sysfs files depending on SMT status Andi Kleen
2016-05-14 1:44 ` [PATCH 3/8] perf/x86/intel: Add Top Down events to Intel Core Andi Kleen
2016-05-14 1:44 ` [PATCH 4/8] perf/x86/intel: Add Top Down events to Intel Atom Andi Kleen
2016-05-14 1:44 ` [PATCH 5/8] perf/x86/intel: Use new topology_max_smt_threads() in HT leak workaround Andi Kleen
2016-05-14 1:44 ` [PATCH 6/8] perf stat: Avoid fractional digits for integer scales Andi Kleen
2016-05-16 12:53 ` Jiri Olsa
2016-05-14 1:44 ` [PATCH 7/8] perf stat: Basic support for TopDown in perf stat Andi Kleen
2016-05-14 1:44 ` [PATCH 8/8] perf stat: Add computation of TopDown formulas Andi Kleen
2016-05-20 10:23 ` Jiri Olsa
2016-05-20 13:38 ` Andi Kleen
2016-05-20 13:43 ` Jiri Olsa
2016-05-20 14:15 ` Andi Kleen
2016-05-20 13:43 ` Andi Kleen
2016-05-16 12:58 ` Jiri Olsa [this message]
2016-05-19 23:51 ` Add top down metrics to perf stat Andi Kleen
2016-05-20 9:59 ` Jiri Olsa
2016-05-20 14:18 ` Andi Kleen
2016-05-20 10:24 ` Jiri Olsa
-- strict thread matches above, loose matches on Subject: below --
2016-05-20 0:09 Andi Kleen
2016-05-05 23:03 Andi Kleen
2016-05-12 7:47 ` Jiri Olsa
2016-04-27 20:00 Andi Kleen
2016-04-04 20:41 Andi Kleen
2016-03-22 23:08 Andi Kleen
2016-03-27 11:27 ` Jiri Olsa
2016-03-27 15:22 ` Andi Kleen
2016-01-20 2:27 Andi Kleen
2016-01-16 1:12 Andi Kleen
2015-08-08 1:06 Andi Kleen
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