Messages in this thread | | | Date | Thu, 15 Sep 2005 16:28:56 +0200 | From | Paolo Ornati <> | Subject | Re: Adaptive read-ahead: benchmarks |
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On Thu, 15 Sep 2005 21:16:51 +0800 WU Fengguang <wfg@mail.ustc.edu.cn> wrote:
> oprofile() { > opcontrol --vmlinux=/temp/kernel/linux-2.6.13ra/vmlinux > opcontrol --start > opcontrol --reset > echo $1 > /proc/sys/vm/readahead_ratio > dd if=/temp/kernel/hugefile of=/dev/null bs=$bs > opreport -l -o oprofile.$1.$bs /temp/kernel/linux-2.6.13ra/vmlinux > opcontrol --stop > }
just a side note: shouldn't you umount and remount "/temp" to remove the pagecache? Or is the file so big that it doesn't matter?
PS: instead of unmount/remount you can use "fadvise": http://www.zip.com.au/~akpm/linux/patches/stuff/ext3-tools.tar.gz
-- Paolo Ornati Linux 2.6.14-rc1 on x86_64 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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