linux-kernel - Re: 2048 CPUs [was: Re: New filesystem for Linux]

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20061108030429.GQ11034@melbourne.sgi.com>
Date:	Wed, 8 Nov 2006 14:04:29 +1100
From:	David Chinner <dgc@....com>
To:	Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>
Cc:	Albert Cahalan <acahalan@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: 2048 CPUs [was: Re: New filesystem for Linux]

On Sat, Nov 04, 2006 at 11:36:49PM +0100, Mikulas Patocka wrote:
> >>Does one Linux kernel run on system with 1024 cpus? I guess it
> >>must fry spinlocks... (or even lockup due to spinlock livelocks)
> >
> >The SGI Altix can have 2048 CPUs.
> 
> And does it run one image of Linux? Or more images each on few cpus?

One image.

> How do they solve problem with spinlock livelocks?

By replacing contended spinlocks withsleeping locks, using no-lock
techniques (e.g. per-cpu) or changing the algorithm to remove the
contention point.

w.r.t filesystem locking scalability, you should read this paper:

http://oss.sgi.com/projects/xfs/papers/ols2006/ols-2006-paper.pdf

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/