From: Alex Elder <aelder@sgi.com>
Date: Wed, 19 May 2010 22:44:14 +0000 (+0000)
Subject: xfstests: 226: have xfs_io use bigger buffers
X-Git-Tag: v1.1.0~163
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=8a08cc2d67fe62adee5729e6c8eda3b8ecac2400;p=xfstests-dev.git

xfstests: 226: have xfs_io use bigger buffers

By default xfs_io uses a buffer size of 4096 bytes.  On test 226,
the result is that the test runs much slower (at least an order
of magnitude) than it needs to.

Add a flag to the "pwrite" command sent to xfs_io so it uses
larger buffers, thereby speeding things up considerably.

Signed-off-by: Alex Elder <aelder@sgi.com>
Reviewed-by: Eric Sandeen <sandeen@sandeen.net>
---

diff --git a/226 b/226
index e0c66307..6f28ac9d 100755
--- a/226
+++ b/226
@@ -49,10 +49,14 @@ _scratch_mount
 
 loops=16
 
+# Buffer size argument supplied to xfs_io "pwrite" command
+buffer="-b $(expr 512 \* 1024)"
+
 echo "--> $loops buffered 64m writes in a loop"
 for I in `seq 1 $loops`; do
 	echo -n "$I "
-	xfs_io -F -f -c 'pwrite 0 64m' $SCRATCH_MNT/test >> $seq.full
+	xfs_io -F -f \
+		-c "pwrite ${buffer} 0 64m" $SCRATCH_MNT/test >> $seq.full
 	rm -f $SCRATCH_MNT/test
 done
 
@@ -63,7 +67,8 @@ _scratch_mount
 echo "--> $loops direct 64m writes in a loop"
 for I in `seq 1 $loops`; do
 	echo -n "$I "
-	xfs_io -F -f -d -c 'pwrite 0 64m' $SCRATCH_MNT/test >> $seq.full
+	xfs_io -F -f -d \
+		-c "pwrite ${buffer} 0 64m" $SCRATCH_MNT/test >> $seq.full
 	rm -f $SCRATCH_MNT/test 
 done