Comments on: Optimize hard disk performance in Linux; benchmarks on Slicehost

By: Senior

Senior — Mon, 07 Jul 2008 12:03:56 +0000

Just to make a quick modification to fix a bug:

for r in 128 256 512 1024 2048; do \
sudo hdparm -a${r} /dev/sda1
echo -n “With readahead $r, “; \
for ((i=1;i<11;i++)); do \
aux=$((aux + \
`sudo hdparm -t /dev/sda1 | grep “Timing buffered” | \
awk -F” ” ‘{print $11;}’ | awk -F”.” ‘{print $1;}’`)); \
done; \
echo “average timing buffered disk reads: $((aux/10))”; \
aux=0; \
done

By: Tummblr

Tummblr — Tue, 29 Jan 2008 17:53:37 +0000

Thanks, chous! An automated benchmark is much more elegant.

By: chous

chous — Tue, 29 Jan 2008 17:50:52 +0000

Using your proposal, an inline script to get the averages automatically:

for r in 128 256 512 1024 2048; do \
echo -n “With readahead $r, “; \
for ((i=1;i<11;i++)); do \
aux=$((aux + \
`sudo hdparm -t /dev/sda1 | grep “Timing buffered” | \
awk -F” ” ‘{print $11;}’ | awk -F”.” ‘{print $1;}’`)); \
done; \
echo “average timing buffered disk reads: $((aux/10))”; \
aux=0; \
done