Messages in this thread | | | Date | Thu, 2 Apr 2009 18:59:27 -0600 | Subject | Re: EXT4-ish "fixes" in UBIFS | From | "Trenton D. Adams" <> |
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On Thu, Apr 2, 2009 at 6:54 PM, Trenton D. Adams <trenton.d.adams@gmail.com> wrote: > On Thu, Apr 2, 2009 at 6:38 PM, Christian Kujau <lists@nerdbynature.de> wrote: >> On Thu, 2 Apr 2009, Trenton D. Adams wrote: >>> I'm thinking of writing a script that monitors performance, and >>> remounts as needed, lol. WHAT A HACK. hehe. >> >> Ugh....my brain hurts :-\ >> >> Christian. > > Yeah, mine too. >
Just to make it hurt more for you, here you go...
On one console I run... dd if=/dev/zero of=/tmp/bigfile bs=1M count=2000
On another I run... perf-mon.sh remounting with sync option, performance dropping remounting without sync option, performance has stabilized
It may be better to write a C program that does a 1M fsync, and if it's taking too long, then remount, lol. Also, this script here, using 1 min load average, will catch CPU intensity as well, which is not really what I want. Ah, it is a hack indeed. ROFL
#!/bin/sh
while true; do UPTIME=$(uptime | xargs | cut -d ' ' -f10 | sed 's/,//'); if [ "$(echo "$UPTIME > 1" | bc)" -eq "1" ]; then mount | egrep 's-sys.*sync' >/dev/null if [ "$?" -ne "0" ]; then echo "remounting with sync option, performance dropping"; mount -o remount,rw,sync /dev/s/sys /; fi else mount | egrep 's-sys.*sync' > /dev/null if [ "$?" -eq "0" ]; then echo "remounting without sync option, performance has stabilized"; mount -o remount,rw /dev/s/sys /; fi fi; sleep 1 done -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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