Hi there --
We are running a clustering solution that employs twelve blades. The first four blades are running CentOS 4.1, while the second group of four are running SuSE 10.3, and the the last four are running the SuSE 11.0 distribution.
The hardware platform for all systems are x86_64 and all but three of the blades are running dual multi-core processors. The majority are dual-core systems, while the last group are quad-core.
Users have been complaining about the quad-core systems running much slower than there single and dual-core counterparts. Here is an excerpt from one e-mail concerning this issue:
> Here is an example, if that helps. I ran identical simulations on [the] quad-core, dual-core, and single nodes. Here is the time breakdown for each:
The single-core takes longer than the dual-core, as expected, since it's processor is much slower. The quad-core takes a similar amount of CPU time as the dual-core but the wall time is much much longer.
All of the jobs started at the same time. Most of the jobs have logged 89 hours of cpu time, except a handful only have 61 hours of cpu time. This handful is the germany nodes. The time not spent in cpu is presumably spent in I/O, making the germanys 32% slower than expected.
I am checking into the hardware side of this issue. The question that I am asking may sound ridiculous, but I wanted to cover all possibilities: Is it possible the SuSE 11.0 distro, or specifically the kernel, coupled with the quad-core processor could result in a slower performance when compared to other distros running on single or dual-core processors?
Thanks for your patience in advance.