adjust run-readtest.sh so that it can be used as-is for testing multiple blocksizes

tools/run-readtest.sh

@@ -5,8 +5,8 @@ filesize=100 # megabytes
 numfiles=128
 nocache=
 interleave=
-blocksize=262144
 needfiles=1
+write_blocksize=262144
 
 if uname -a | grep --silent arwin ; then
     ddmega=m
@@ -20,7 +20,7 @@ while [ $# -gt 1 ] ; do
 	-f) filesize=$2; shift; shift ;;
 	-n) numfiles=$2; shift; shift ;;
 	-N) nocache="-s"; shift; shift ;;
-	-b) blocksize=$2; shift; shift ;;
+        *) break ;;
     esac
 done
 
@@ -40,6 +40,7 @@ else
 fi
 
 if [ x$needfiles != x ] ; then
+    echo "Building files for test..."
     if [ x$interleave = x ] ; then
 	
 	#
@@ -47,13 +48,12 @@ if [ x$needfiles != x ] ; then
 	#
 	
 	for i in `seq 1 $numfiles` ; do
-	    dd of=$dir/testfile_$i if=/dev/zero bs=1$ddmega count=$filesize
-	    echo $i
+	    dd of=$dir/testfile_$i if=/dev/zero bs=1$ddmega count=$filesize >/dev/null 2>&1
 	done
     else
 	
 	#
-	# Create files interleaved, adding $blocksize to each
+	# Create files interleaved, adding $write_blocksize to each
 	# file in turn.
 	#
 	
@@ -61,25 +61,26 @@ if [ x$needfiles != x ] ; then
 	limit=`expr $filesize * 1048576`
 	while [ $size -lt $limit ] ; do
 	    for i in `seq 1 $numfiles` ; do
-		dd if=/dev/zero bs=$blocksize count=1 >> $dir/testfile_$i
+		dd if=/dev/zero bs=$write_blocksize count=1 >> $dir/testfile_$i >/dev/null 2>&1
 	    done
-	    size=`expr $size + $blocksize`
-	    echo "Files now @ $size bytes"
+	    size=`expr $size + $write_blocksize`
 	done
     fi
 fi
 
-if uname -a | grep --silent arwin ; then
-    # clears cache on OS X
-    sudo purge
-elif [ -f /proc/sys/vm/drop_cache ] ; then
-     # Linux cache clearing
-    echo 3 | sudo tee /proc/sys/vm/drop/cache >/dev/null
-else       
-    # need an alternative for other operating systems
-    :
-fi
+for bs in $@ ; do
 
-echo "Ready to run ..."
-
-./readtest $nocache -b $blocksize -q $dir/testfile_%d
+    if uname -a | grep --silent arwin ; then
+        # clears cache on OS X
+        sudo purge
+    elif [ -f /proc/sys/vm/drop_cache ] ; then
+        # Linux cache clearing
+        echo 3 | sudo tee /proc/sys/vm/drop/cache >/dev/null
+    else       
+        # need an alternative for other operating systems
+        :
+    fi
+    
+    echo "Blocksize $bs"
+    ./readtest $nocache -b $bs -q $dir/testfile_%d
+done