Honza, > Well, rather than unstable, they seems to be more memory layout > sensitive I would say. (the differences are more or less reproducible, > not completely random, but independent on the binary itself. I can't > think of much else than memory layout to cause it). I always wondered > if things like page coloring have chance to reduce this noise, but I > never actually got around trying it.
You didn't mention the processors in your systems, but I wonder if they are dual-core. If so, perhaps it's got to do with the fact that each K8 core has its own L2, whereas C2 chips have a shared L2. Then, try preceding "runspec" with "taskset 0x02" to avoid the process from hopping between cores and finding cold caches (though the kernel strives to stick a process to a single core, it's not perfect). HTH -- _______________________________________________________ Evandro Menezes AMD Austin, TX
