Messages in this thread | | | Date | Wed, 14 Jul 1999 22:06:22 +0200 | From | Jamie Lokier <> | Subject | Re: Clearing the I/O caches? (for benchmark tests) |
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Stephen C. Tweedie wrote: > Nearly. The ext2 filesystem keeps a cache of recently-accessed bitmap > buffers pinned in memory, and once that cache is primed you can't flush > it unless you unmount the filesystem. If you have any processes still > cd'ed to the active filesystem, then they will also be keeping directory > inodes pinned in the inode cache.
I use the following script to flush I/O caches for benchmarks. Does it suffer from the same problem?
thanks, -- Jamie
#!/bin/sh
# Linux only! # Flush inode, dentry and buffer cache of all mounted filesystems. # Must be run as root. # # -- Jamie Lokier, March 1999
case "`id -u`" in 0) ;; *) echo Only root can run this script. 1>&2; exit 1 ;; esac
mount | sort -k3 -r | \ while read dev ON dir TYPE type etc; do echo mount $dir -o remount mount $dir -o remount done
mount | sort -k1 | \ while read dev ON dir TYPE type etc; do case "$dev" in /dev/*) echo hdparm -f $dev hdparm -f $dev >/dev/null ;; esac done
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