From: Michael Mol <mikemol@gmail.com>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] emerge -j, make -j and make -l
Date: Mon, 28 Nov 2011 13:54:44 -0500 [thread overview]
Message-ID: <CA+czFiAK0idQhqw--j2tregB1P7-pk1gaoMGfp9zgHnGfn7pgQ@mail.gmail.com> (raw)
In-Reply-To: <CA+czFiBP+czst5Ec+GLgXudCjiUA23ivAP4nFLQ89MxctM2n7w@mail.gmail.com>
On Mon, Nov 28, 2011 at 1:51 PM, Michael Mol <mikemol@gmail.com> wrote:
> On Mon, Nov 28, 2011 at 12:26 AM, Pandu Poluan <pandu@poluan.info> wrote:
[snip]
> FWIW, I strongly suspect that N should be your number of *logical*
> cores, not your number of physical cores. I believe most of the
> overhead
...and finishing my sentence.
I believe most of the overhead comes from context switching between
two threads, and hyperthreading adds CPU hardware specifically for the
purpose of avoiding that costly context switch when controlling which
thread's instructions get sent up the pipeline.
--
:wq
next prev parent reply other threads:[~2011-11-28 18:57 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-26 15:22 [gentoo-user] emerge -j, make -j and make -l Michael Mol
2011-11-26 15:34 ` Alex Schuster
2011-11-26 15:51 ` Michael Mol
2011-11-26 16:03 ` Stefan G. Weichinger
2011-12-19 19:58 ` Stefan G. Weichinger
2011-12-19 20:05 ` Michael Mol
2011-11-26 15:35 ` Stefan G. Weichinger
2011-11-27 9:27 ` Mick
2011-11-27 10:09 ` Michael Mol
2011-11-27 17:56 ` Pandu Poluan
2011-11-27 20:16 ` Michael Mol
2011-11-27 20:42 ` Michael Mol
2011-11-27 20:51 ` Alex Schuster
2011-11-28 0:42 ` Pandu Poluan
2011-11-27 20:57 ` Alan McKinnon
2011-11-28 1:06 ` Pandu Poluan
2011-11-28 5:30 ` Michael Mol
2011-11-28 5:55 ` Pandu Poluan
2011-11-27 23:21 ` Neil Bothwick
2011-11-28 0:54 ` Pandu Poluan
2011-11-28 1:10 ` [gentoo-user] " Jack Byer
2011-11-28 1:35 ` Dale
2011-11-28 2:16 ` Pandu Poluan
2011-11-28 7:02 ` Dale
2011-11-28 4:34 ` [gentoo-user] " Michael Mol
2011-11-28 5:13 ` Pandu Poluan
2011-11-28 5:27 ` Michael Mol
2011-11-28 9:27 ` Neil Bothwick
2011-11-28 13:36 ` Pandu Poluan
2011-11-28 16:36 ` Stefan G. Weichinger
2011-11-29 11:08 ` Neil Bothwick
2011-11-29 13:47 ` Stefan G. Weichinger
2011-11-29 15:39 ` Neil Bothwick
2011-11-29 18:50 ` Stefan G. Weichinger
2011-11-28 4:30 ` Michael Mol
2011-11-27 10:39 ` covici
2011-11-27 10:52 ` Michael Mol
2011-11-27 10:58 ` Dale
2011-11-27 14:47 ` covici
2011-11-27 15:02 ` Dale
2011-11-27 15:25 ` covici
2011-11-27 17:26 ` Michael Hampicke
2011-11-27 17:46 ` Pandu Poluan
2011-11-27 22:07 ` Mark Knecht
2011-11-27 23:13 ` Dale
2011-11-28 4:28 ` Michael Mol
2011-11-28 5:26 ` Pandu Poluan
2011-11-28 9:27 ` Neil Bothwick
2011-11-28 10:22 ` Pandu Poluan
2011-11-28 13:03 ` Jorge Martínez López
2011-11-28 13:26 ` Pandu Poluan
2011-11-28 18:51 ` Michael Mol
2011-11-28 18:54 ` Michael Mol [this message]
2011-11-28 23:53 ` Michael Mol
2011-12-10 4:35 ` Michael Mol
2011-12-27 15:16 ` Michael Mol
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