linux core better?

Posted Jun 12, 2007 23:54 UTC (Tue) by genius (guest, #19981)
Parent article: Linus on GPLv3 and ZFS

i dont think i can agree with it. that was a blog last time about the linux kernel having problem scaling beyond 8-way compared to bsd. not sure whether they have solved it. on the other hand, linux has definitely revived interest in unix.

what epoch are you posting from?

Posted Jun 13, 2007 2:37 UTC (Wed) by xoddam (subscriber, #2322) [Link] (2 responses)

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

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

what epoch are you posting from?

Posted Jun 13, 2007 3:03 UTC (Wed) by Nick (guest, #15060) [Link] (1 responses)

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 (guest, #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.