linux-kernel - Re: [PATCH 06/13] perf tools: Cache dso data file descriptor

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Message-ID: <538DCF59.6000808@gmail.com>
Date:	Tue, 03 Jun 2014 07:36:25 -0600
From:	David Ahern <dsahern@...il.com>
To:	Jiri Olsa <jolsa@...nel.org>, linux-kernel@...r.kernel.org
CC:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Jean Pihet <jean.pihet@...aro.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 06/13] perf tools: Cache dso data file descriptor

On 6/2/14, 3:18 PM, Jiri Olsa wrote:
> We keep dsos data file descriptors open until their count reaches
> the half of the current fd open limit (RLIMIT_NOFILE). In this case
> we close file descriptor of the first opened dso object.
>
> We've got overall speedup (24% for my workload) of report:
>   'perf report --stdio -i perf-test.data' (3 runs)
>    (perf-test.data size was around 12GB)
>
>    current code:
>     446,826,474,217      cycles                     ( +-  0.23% )
>     669,435,100,846      instructions               ( +-  0.03% )
>
>       266.380674551 seconds time elapsed            ( +-  0.37% )
>
>    change:
>     558,345,509,819      cycles                     ( +-  0.55% )
>     817,283,647,637      instructions               ( +-  0.03% )
>
>       351.564209617 seconds time elapsed            ( +-  0.89% )

message is confusing. Looks like time went up.

David
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