Hi Banks,

Some basic stats might shed some light, e.g. vmstat 5, mpstat 5, iostat -xnz 5, prstat -Lmc 5 ... all running from just before you start the tests until things are "normal" again.

Memory starvation is certainly a possibility. The ARC can be greedy and slow to release memory under pressure.

Phil

Sent from my iPhone

On 10 Jan 2010, at 13:29, bank kus <kus.b...@gmail.com> wrote:

Hi Phil
You make some interesting points here:

-> yes bs=1G was a lazy thing

->  the GNU cp I m using does __not__ appears to use mmap
open64 open64  read write  close close is the relevant sequence

-> replacing cp with dd 128K * 64K does not help no new apps can be launched until the copies complete.

Regards
banks
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