All,
I've been monitoring performance of my GFS cluster and noticed something weird.
I created 16 million directories with a script very similar to this:
for ($a=0; $a<256; $a++) {
for ($b=0; $b<256; $b++) {
for ($c=0; $c<256; $c++) {
mkdir -p /mnt/gfs/hex($a)/hex($b)/hex($c);
}
}
}
This code wont work but you all get the idea. Anyway I was running
chown on all the directories with a script like this:
chdir /mnt/gfs
DIRS = `ls -la | awk 'print {$9}'`
for dir in $DIRS; do
chown -R newuser $dir/*
echo $dir
done
This script will execute chown on 64K directories and print the
current parent directory.
This script starts to perform slower and slower as time goes on. I
ran gfs_tool -c counters /mnt/gfs to monitor locks and the number of
locks is over 5.7million and growing.
The first few 64K directories completed chowning within 45sec...now
its over 8-9 minutes...and increasing every 64K.
Is there a way to remove these locks?
/proc/cluster/lock_dlm/drop_count is 50000 Would setting this value to 0 help?
--
Jon
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