linux-kernel - Re: [RFC][PATCH 00/13] percpu rwsem -v2

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Date:	Tue, 23 Jun 2015 12:00:54 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Daniel Wagner <daniel.wagner@...-carit.de>
Cc:	Peter Zijlstra <peterz@...radead.org>, oleg@...hat.com,
	paulmck@...ux.vnet.ibm.com, tj@...nel.org, mingo@...hat.com,
	linux-kernel@...r.kernel.org, der.herr@...r.at, dave@...olabs.net,
	riel@...hat.com, viro@...IV.linux.org.uk,
	torvalds@...ux-foundation.org
Subject: Re: [RFC][PATCH 00/13] percpu rwsem -v2


* Daniel Wagner <daniel.wagner@...-carit.de> wrote:

> The machine has 0.5TB memory and doesn't seem to be really concerned about
> 'make -j200'
> 
> make clean && time make -j200
> 
> mainline 4.1.0
> 2nd run
> 	real    1m7.595s
> 	user    28m43.125s
> 	sys     3m48.189s
> 
> 
> tip v4.1-2756-ge3d06bd
> 2nd run
> 	real    1m6.871s
> 	user    28m50.803s
> 	sys     3m50.223s
> 3rd run
> 	real    1m6.974s
> 	user    28m52.093s
> 	sys     3m50.259s
> 
> 
> tip v4.1-2769-g6ce2591 (percpu-rwsem)
> 2nd run
> 	real    1m7.847s
> 	user    29m0.439s
> 	sys     3m51.181s
> 3rd run
> 	real    1m7.113s
> 	user    29m3.127s
> 	sys     3m51.516s
> 
> 
> 
> Compared to 'make -j64' on tip v4.1-2756-ge3d06bd
> 2nd run
> 	real    1m7.605s
> 	user    28m3.121s
> 	sys     3m52.541s

Btw., instead of just listing the raw runs, you can get an automatic average and 
stddev numbers with this:

  $ perf stat --null --repeat 5 --pre 'make clean' --post 'sync' make -j200

 Performance counter stats for 'make -j200' (3 runs):

       29.068162979 seconds time elapsed                                          ( +-  0.27% )

Thanks,

	Ingo
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