[CentOS] maximum cpus/cores in CentOS 4.1
lowen at pari.edu
Fri Sep 9 16:02:23 UTC 2005
On Thursday 08 September 2005 10:49, Tony Schreiner wrote:
> What is the maximum number of AMD64 cores supported by CentOS 4?
While I know this doesn't help much in this context, and doesn't directly
answer your question, indirectly it is relevant.
The Gigaplane/UPA architecture of the Sun Enterprise XX00 (3000-6500) allows
up to16 connections (in the 6X00; 8 connections in the E4X00 and E5X00)).
Each pair of CPU's has local RAM on each UPA board (crossbar switched
interconnect) that has a port on the Gigaplane bus (2.6GB/s throughput in the
83MHz version, 3.2GB/s at 100MHz), up to 15 CPU/memory boards plus one I/O
board per E6500 chassis/Gigaplane, giving up to 30 CPU's and 60GB of RAM
On this hardware, the 2.6 SPARC kernel is artificially limited to 24
processors; there seems to be stability issue over 24 CPU's. I'm burning in
a 2.6.12 SPARC kernel (Corona from the Aurora project) on a 14x400 E6500 now
(16GB of RAM).
Oddly enough, the power requirements for this beast and for an octal Opteron
are pretty matched, about 1.5KW or a little more. Certainly the 8x Opteron
will be faster on many things; but under heavy multiuser load the 14-way
SPARC does a surprisingly good job, with around three quarters the
performance of a dual 3GHz Xeon (that outclasses the SPARC box in every way
possible except interconnect) at a load average of 30 or so. At a load
average of 30, the E6500 feels more responsive than my laptop (1.7GHz Pentium
M) at a load average of 2.
Director of Information Technology
Pisgah Astronomical Research Institute
1 PARI Drive
Rosman, NC 28772
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