On Fri, 2 Dec 2005, Rick DeNatale wrote:
don't have "swapiness". I'm on a 2.4 machine, maybe
swapiness is a 2.6ism
You might be able to use the bash built-in command ulimit
This didn't help but it was an interesting enough idea that
it was worth testing.
Test: time to download a 10M webpage from a machine on the
same (quiet) network. These bytes will not touch the local
disk and will only go through the network drivers and memory
presumably staying in memory unless flushed by some other
process. Then copy CD iso's (these being bigger than the
machine's memory of 192M) from one local disk to another,
and retime the webpage dowload after an iso's worth of
copying.
time to copy 10M of files cp process
35-40 sec none
53-55 sec unlimited cp
53-55 sec ulimit -m 20480
(ie 20M working set)
53-55 sec ulimit -v 20480
(ie 20M swap)
I tried the ulimit -v commands first and found that if the
size was small enough I couldn't load bash (killed) or man
bash (killed). On finding no effect on the copy with -v
20480, I realised that the machine wasn't swapping anyhow
and I was barking up the wrong tree. Looking at man ulimit
again, I decided I really wanted -m. Still changing -m from
unlimited to 20M didn't affect the problem.
Neat idea though ;-)
Joe
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