Messages in this thread | | | Date | Wed, 4 Apr 2012 20:53:25 -0400 | Subject | CPU Load Balancer / Scheduler / CFS | From | Robert W <> |
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I'm seeing some bizarre differences between two servers (one running 2.6.32 and the other 2.6.18) with how processes are spread across CPUs.
I created a simple test client: https://gist.github.com/2306761 which forks 4 times to create processes which just consume cpu.
On 2.6.18, the processes are distributed across CPUs as expected (all 4 processes are consuming 100%). But on 2.6.32, the distribution varies. Sometimes it's (100%, 33%, 33%, 33%), other times it's (100%, 100%, 50%, 50%), etc.. while all the other CPUs sit completely idle..
Both servers have many cores (more than 4). Both servers each have 2 physical processors, and are hyper-threaded.
What could be going on here?
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