iowatcher: spawn NPROCESSORS_ONLN for rsvg-convert-s
iowatcher currently always spawns 8 rsvg-convert processes, no matter
how many CPUs a system has. I did some limited testing of different
numbers of rsvg-convert processes. Here are the results:
8 processes:
real 4m2.194s
user 23m36.665s
sys 0m38.523s
20 processes:
real 2m28.935s
user 24m51.817s
sys 0m49.227s
40 processes:
real 2m28.150s
user 24m56.994s
sys 0m49.621s
Note that this is the time it takes for a full run of iowatcher -- I
didn't separate out just the rsvg-convert portion.
Given the above results, it seems like a reasonable thing to spawn one
rsvg-convert process per cpu.
Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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