Very Computer

by **Ved** » Wed, 11 Jun 1997 04:00:00

Are there versions of linux which support multiple processors? If so,
what is the limit and what versions?

thanks,
--
--------
William L. Lewis
System Administrator, Model Based Vision Lab, Wright Patterson AFB

http://www.mbvlab.wpafb.af.mil/~wlewis/wlewis.html

by **G. Sumner Hay** » Thu, 12 Jun 1997 04:00:00

Quote:> Are there versions of linux which support multiple processors? If so,
> what is the limit and what versions?

Everything after about 1.3.75 (or thereabouts) supports SMP; this
includes 2.0.x and 2.1.x. It was busted in the mid-2.0 kernels for a
little bit, but should work fine in 2.0.30 (and 2.0.29).

Edit the top-level Makefile in the source tree and uncomment the SMP=1
definition.

The 2.1.x is working on adding finer grained locking to improve
efficiency. Right now, more than 4 processors probably isn't worthwile.

Speedups will be greater in code that doesn't require a lot of kernel
time, at least in 2.0.x. Remember, you need multiple threads or
processes to see the benefits of SMP.

TTFN,

Sumner

--

Apologies to legitimate repliers.

by **Joseph Slo** » Thu, 26 Jun 1997 04:00:00

[Posted and mailed]

Quote:> Are there versions of linux which support multiple processors? If so,
> what is the limit and what versions?

Yes, Linux has supported mulitple CPUs since 1.3.32 or so.

www.dejanews.com, for instance, is a multi-CPU linux server.

There are web pages dealing with SMP if you start looking in the usual
Linux sites. I beleive the current implementation (stable but not yet
fully optimized) can run on up to 32 CPUs, but I've never seen Linux
running on more than 4 CPUs.

jjs

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Q: Mulitple processors