From mboxrd@z Thu Jan 1 00:00:00 1970 MIME-Version: 1.0 References: <7aa20c07322147e6@orthanc.ca> <20181011230430.8ec148a3cb2a4d95180a4ad2@eigenstate.org> <4A1686D0-C80C-417F-A3D6-3F9EA327D35F@lsub.org> In-Reply-To: From: Charles Forsyth Date: Tue, 16 Oct 2018 00:06:28 +0100 Message-ID: To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net> Content-Type: multipart/alternative; boundary="00000000000063d05a05784c7dc2" Subject: Re: [9fans] zero copy & 9p (was Re: PDP11 (Was: Re: what heavy negativity!) Topicbox-Message-UUID: edde7702-ead9-11e9-9d60-3106f5b1d025 --00000000000063d05a05784c7dc2 Content-Type: text/plain; charset="UTF-8" They are machines designed to run programs most people do not write! On Mon, 15 Oct 2018 at 19:20, hiro <23hiro@gmail.com> wrote: > > Also, NUMA effects are more important in practice on big multicores. Some > > of the off-chip delays are brutal. > > yeah, we've been talking about this on #cat-v. even inside one CPU > package amd puts multiple dies nowadays, and the cross-die cpu cache > access delays are approaching the same dimensions as memory-access! > > also on each die, they have what they call ccx (cpu complex), > groupings of 4 cores, which are connected much faster internally than > towards the other ccx > > --00000000000063d05a05784c7dc2 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
They are machines designed to run programs most people do = not write!

On Mon, 15 = Oct 2018 at 19:20, hiro <23hiro@gmai= l.com> wrote:
> Also, NUM= A effects are more important in practice on big multicores. Some
> of the off-chip delays are brutal.

yeah, we've been talking about this on #cat-v. even inside one CPU
package amd puts multiple dies nowadays, and the cross-die cpu cache
access delays are approaching the same dimensions as memory-access!

also on each die, they have what they call ccx (cpu complex),
groupings of 4 cores, which are connected much faster internally than
towards the other ccx

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