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Subject: Re: svn commit: r253002 - head
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From: Garrett Cooper <yaneurabeya@gmail.com>
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References: <201307072039.r67KdCdR028908@svn.freebsd.org>
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To: Devin Teske <dteske@freebsd.org>
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Cc: "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>,
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On Jul 8, 2013, at 5:12 PM, Teske, Devin wrote:

> On Jul 7, 2013, at 2:15 PM, Alfred Perlstein wrote:
>=20
>> On 7/7/13 2:01 PM, Garrett Cooper wrote:
>>> Why the magic number 12?
>>=20
>> Numbers higher seem to result in worse performance as reported by =
some members of my team.
>>=20
>=20
> We've run as high as -j48 ... number of logical cpu's "times-two" (it =
was on a box with 24 logical CPUs).
>=20
> We did buildworld in under 9 minutes. Beyond the "times-two" rule we =
saw a slow-down.
>=20
> NOTE: I might also mention this was on RAID-1 SSD.

+1 as well, which is part of the reason why I questioned the performance =
recommendation, but that's beside the point. Thanks!=