On 2019-08-27 8:13 PM, Andrew Rowley wrote:
FWIW - debugging performance of forked Unix process startup/overhead
is a
mess - we had one customer who was seeing terrible performance when
fork/execing tiny little shell processes that did practically
nothing. It
was only happening on one of their LPARs. The IBM Support center was
involved for a really long time, and I don't know if they ever really
figured out what was wrong.
It wasn't running under the bash shell was it? I noticed that bash has
very significant overhead compared to the regular shell.
I did some investigation using SMF data, and just wrote it up here:
https://www.blackhillsoftware.com/news/2019/08/27/comparing-bash-and-bin-sh-on-z-os/
Great write-up. Bash doesn't use local spawn so it always runs
sub-processes in child address spaces. I have reported this so Rocket
are aware
and have opened a ticket. I'm not sure if it will be addressed anytime
soon. Probably not.
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