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Date: Mon, 1 Jun 2009 09:41:07 -0400 From: J Louis <handstogether8@...il.com> To: linux-kernel@...r.kernel.org Subject: Linux scheduler capabilities for batch jobs. Hello All, I have been writing user land server code and increasingly I find myself writing resource management code which I think would be better handled by the scheduler. The problem can be described as "don't run this process if the machine is swapping." I would think that this would be a common enough need that it was already in the kernel. I'm hoping it is and I have simply overlooked it (part of the reason for this post,) but I've looked around a good bit and most of the scheduler enhancements have to do with real time and latency, not batch jobs. My problem is analogous to a parallel make. Say I have an 8 CPU machine, and I run "make -j8". If the total memory of the 8 jobs throws the machine into swap, it begins to thrash and runtime is awful. I believe this is aggravated by the scheduler trying to be fair, and keeping all 8 processes running. If it was possible to tell the scheduler that it was OK not to be fair when scheduling these processes, I think the total runtime could be reduced if it put some of the processes to sleep while others completed. Is there a way to tell the scheduler it is allowed to do this? Should there be? Thank You, Hands -- 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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