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Date: Sat, 17 Mar 2007 16:39:08 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Rik van Riel <riel@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>, Con Kolivas <kernel@kolivas.org>,
       ck@vds.kolivas.org, Al Boldi <a1426z@gawab.com>,
       Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org
Subject: Re: RSDL v0.31
Message-ID: <20070317153908.GA26036@elte.hu>
References: <200703042335.26785.a1426z@gawab.com> <200703170040.48316.kernel@kolivas.org> <1174059299.7886.25.camel@Homer.simpson.net> <200703170813.32594.kernel@kolivas.org> <1174084207.7009.9.camel@Homer.simpson.net> <45FBFC18.8060700@redhat.com>
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* Rik van Riel <riel@redhat.com> wrote:

> The increased AIM7 throughput (and the other benchmark results) looked 
> very promising to me.
> 
> I wonder what we're doing wrong in the normal scheduler...

there's a relatively easy way to figure out whether it's related to the 
interactivity code: try AIM7 with SCHED_BATCH as well, to take most of 
the 'interactivity effects' out of the picture.

build the attached setbatch.c code and do "./setbatch $$" to change the 
shell to SCHED_BATCH (and all its future children will be SCHED_BATCH 
too).

	Ingo

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/*
 * Set a given PID to be a SCHED_BATCH process.
 * 
 * Copyright (C) 2002 Ingo Molnar
 */
#include <time.h>
#include <stdio.h>
#include <sched.h>
#include <stdlib.h>
#include <sys/types.h>
#include <linux/unistd.h>

int main (int argc, char **argv)
{
	int pid, ret;
	struct sched_param p;

	p.sched_priority = 0;

	if (argc != 2) {
		printf("usage: setbatch <pid>\n");
		exit(-1);
	}
	pid = atol(argv[1]);

	ret = sched_setscheduler(pid, 3, &p);

	if (ret) {
		printf("could not set pid %d to SCHED_BATCH: err %d.\n", pid, ret);
		return -1;
	}
	printf("pid %d is SCHED_BATCH from now on.\n", pid);
	return 0;
}

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