Messages in this thread | | | Date | Thu, 15 Sep 2005 22:52:53 +0800 | From | WU Fengguang <> | Subject | Re: Adaptive read-ahead: benchmarks |
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On Thu, Sep 15, 2005 at 04:28:56PM +0200, Paolo Ornati wrote: > 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? Thanks for the reminding. I'm currently using huge files for testing: # ll bigfile hugefile -rw-r--r-- 2 root root 626M 2005-09-07 20:29 bigfile -rw-r--r-- 2 root root 3.7G 2005-09-11 11:24 hugefile The umount tip seems nice and I'll use it for future testing :) > > PS: instead of unmount/remount you can use "fadvise": > http://www.zip.com.au/~akpm/linux/patches/stuff/ext3-tools.tar.gz OK, I'll check it. > > -- > Paolo Ornati > Linux 2.6.14-rc1 on x86_64
-- WU Fengguang Dept. of Automation University of Science and Technology of China Hefei, Anhui - 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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