John R Pierce wrote:
Morten Torstensen wrote:
Tru Huynh wrote:
[tru@quadcore ~]$ uname -a
Linux quadcore 2.6.9-42.0.3.ELsmp #1 SMP Fri Oct 6 06:28:26 CDT 2006
x86_64 x86_64 x86_64 GNU/Linux
[tru@quadcore ~]$ grep -A4 processor /proc/cpuinfo
processor : 0
Just take care with more than 8 CPUs, because you need the largesmp
kernel then. Worked on a 8 socket, 16 CPU system where that was a
pain due to binary kernel modules.
Now those machines could be 32 CPU systems... and you could add 8
sockets more. 64 CPUs on Intel platform with commodity hardware. Not
that many years ago that would have been utopia :)
I believe those quad core Xeon "Clovertown" CPUs support
hyperthreading too. which means 2 of them has 16 execution threads if
you've enabled hyperthreading in the BIOS. While many people
denigrate hyperthreading, we've got some Java
messaging/database/middleware stuff that gets a HUGE boost on a older
dual xeon* with HT enabled... this is with 2.8Ghz, 533Mhz FSB, 512K
cache Xeons of this flavor:
No "Core based" CPU that I've seen so far (Pentium M, Core, Core 2, Xeon
51xx) can enable hyperthreading though they will have the ht flag show
up in /proc/cpuinfo. The ht flag though was present in every Pentium 4
CPU, it is not a solid indicator that Hyperthreading can be turned on.
Don't ask me why this is, ask Intel...
Jay
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