topic Re: Script for stress test memory utilization in Operating System - HP-UX

Script for stress test memory utilization

freddy_21 — Mon, 03 Jul 2006 05:40:43 GMT

anybody have script for stress memory utilization. I am learning about PRM, but my memory utilization cant meet with my PRM's configuration.

Thanks
Freddy

Re: Script for stress test memory utilization

H.Merijn Brand (procura — Mon, 03 Jul 2006 05:48:16 GMT

Use perl :)

--8<---
#!/usr/bin/perl

use strict;
use warnings;

fork for 1 .. 5;
for (1 .. 10000) {
my $a = "xxxxx" x int rand 1_000_000;
my $b = ~$a;
my $c = reverse $b;
}
-->8---

That should stress mem quite a bit

Enjoy, Have FUN! H.Merijn

Re: Script for stress test memory utilization

Victor Fridyev — Mon, 03 Jul 2006 06:42:16 GMT

Hi,

Try this one:
Run some dd commands using as input device different disks:

dd if=/dev/dsk/cXXXX of=/dev/null bs=32768k

HTH

Re: Script for stress test memory utilization

H.Merijn Brand (procura — Mon, 03 Jul 2006 06:55:24 GMT

That is an IO stress, not a memory stress

I couldn't think of a real memory stress that would not somehow also stress the CPU.

When I used this:
--8<---
use strict;
use warnings;

fork for 1 .. 5;
for (1 .. 10000) {
my $a = "xxxx" x 10_000_000;
my $b = reverse $a;
}
-->8---

Memory started sky-rocketing, and the system started swapping. You would need to find the point where the system doesn't swap (yet)

Enjoy, Have FUN! H.Merijn

Re: Script for stress test memory utilization

H.Merijn Brand (procura — Mon, 03 Jul 2006 06:55:37 GMT

Re: Script for stress test memory utilization

freddy_21 — Mon, 03 Jul 2006 07:11:03 GMT

i already test with that script. The script worked with perfect... Thanks