>>> On Thu, May 8, 2008 at 6:11 AM, in message
<[EMAIL PROTECTED]>, Jorge Souto
<[EMAIL PROTECTED]> wrote:
-snip-
> We ran several iozone benchmark with different options:
> ./iozone/iozone -i 0 -i 2 -s 2000m -t 16 -r 64k -C -e -w -F {list of files}
> - with 8 threads (1000m and 2000m file size)
> - with 16 threads (1000m and 2000m file size)
>
>
> Using 16 threads and 2000m file size, the linux hangs completely. I can't
> connect to it with ssh or by 3270 (so, no tcp/ip problem).
> In perfsvm I see it takes 100% CPU, but most of the cpu consumption is for
> the supervisor.
>
> Detailed data for user
> CGEFLS01
> Total CPU : 97.6% Storage def. : 1024MB Page fault rate:
> .0/s
> Superv. CPU : 64.3% Resident <2GB: 104303 Page read rate :
> .0/s
> Emulat. CPU : 33.3% Resident >2GB: 156848 Page write rate:
> .0/s
> I haven't applied the VM64306 apar, but I've tried the NOQIOASSIST
> workaround with no result (and we have 1GB of guest storage, so
> it's no related).
If I'm reading correctly, you're running 16 threads with a 2GB file size for
each of them, in a 1GB virtual machine. This is just a wild guess, but it
sounds like your Linux system is thrashing itself to death. If you're
collecting SAR data, it should be able to confirm or refute that guess.
Mark Post
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