# the SCSI devices to measure
scsidevs="/dev/sde /dev/sdh"
-# result file prefix
+# result file prefix. date/time+hostname makes unique
# NB ensure the path exists if it includes subdirs
-rslt=/tmp/sg_dd_rslt
+rslt=/tmp/sgpdd_survey_`date +%F@%R`_`uname -n`
# what to do (read or write)
actions="write read"
crghi=256
# threads to share between concurrent regions per device
-# NB survey skips over #thr < #regions and #thr > SG_MAX_QUEUE
+# NB survey skips over #thr < #regions and #thr/#regions > SG_MAX_QUEUE
thrlo=1
-thrhi=8192
+thrhi=4096
#####################################################################
+# leave the rest of this alone unless you know what you're doing...
-# disk block size (Bytes)
+# sgp_dd's idea of disk sector size (Bytes)
bs=512
-
-# max # threads per individual sgp_dd instance
+# and max # threads one instance will spawn
SG_MAX_QUEUE=16
+# map given device names into SG device names
i=0
devs=()
for d in $scsidevs; do
done
ndevs=${#devs[@]}
-start=`date +%F@%R`
-rsltf=${rslt}_${start}.summary
+rsltf=${rslt}.summary
+workf=${rslt}.detail
echo -n > $rsltf
-workf=${rslt}_${start}.detail
echo -n > $workf
-tmpf=${rslt}_${start}.tmp
print_summary () {
if [ "$1" = "-n" ]; then
print_summary "ENOMEM"
continue
fi
+ # run tests
for action in $actions; do
print_summary -n "$action "
echo "=====> $action" >> $workf
+ tmpf=${workf}_tmp
# start test
t0=`date +%s.%N`
for ((i=0;i<ndevs;i++)); do
done
wait
t1=`date +%s.%N`
- # collect all results in 1 file
+ # collect/check individual stats
echo > $tmpf
ok=0
for ((i=0;i<ndevs;i++)); do