Joep Vesseur wrote:
All,
I was wondering why "zfs destroy -r" is so excruciatingly slow compared to
parallel destroys.
< SNIP>
while a little handy-work with
# time for i in `zfs list | awk '/blub2\\// {print $1}'` ;\
do ( zfs destroy $i & ) ; done
yields
real 0m8.191s
user 0m6.037s
sys 0m16.096s
An 38.8 time improvement (at the cost of some extra CPU load)
Why is there so much overhead in the sequential case? Or have I oversimplified
the issues at hand with this simple test?
One reason is that you're not timing how long it takes for the destroy's
to complete. You're only timing how long it takes to start all the jobs
in the background.
-Kyle
Joep
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