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Date: Wed, 4 Apr 2012 20:53:25 -0400 From: Robert W <robertwalters83@...il.com> To: linux-kernel@...r.kernel.org Subject: CPU Load Balancer / Scheduler / CFS 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? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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