what epoch are you posting from? [LWN.net]

what epoch are you posting from?

Posted Jun 13, 2007 2:37 UTC (Wed) by xoddam (subscriber, #2322)
In reply to: linux core better? by genius
Parent article: Linus on GPLv3 and ZFS

> linux kernel having problem scaling beyond 8-way compared to bsd.

You're several years behind. A long time_t in LKML-land.

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what epoch are you posting from?

Posted Jun 13, 2007 3:03 UTC (Wed) by Nick (subscriber, #15060) [Link]

Poster is probably talking about this blog entry

http://jeffr-tech.livejournal.com/5705.html

So he is right, and Linux did have a problem on this
workload. Basically it was a combination of a glibc
inefficiency and the fact that nobody seems to have
reported such a workload before. The fix was basically
a small change to the way malloc/free works, and a
little patch to the kernel to optimise the new path
used by glibc.

http://www.thisishull.net/showpost.php?s=5d2bfa8b5a070728...

That post found the fixes to have eliminated the big
dropoff. Note it still doesn't scale past 8-way, but
this is likely to be a MySQL issue -- BSD doesn't do
any better.

what epoch are you posting from?

Posted Jun 14, 2007 7:36 UTC (Thu) by drag (subscriber, #31333) [Link]

Those things seem to have triggered some sort of bug.

Rest assured people do have real-world Linux boxes that have over 512 cpus in a single system image. SGI has boxes, at least, have Linux boxes with 4096 cpus in a single system image.

As far as clustering goes.. there are Linux systems with tens of thousands of cpus going.

Linux kernel itself does scale past 8 cpus. Of course nothing is perfect.