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0e1f616
(Get the code!)
I tried to measure the impact of ionice on updatedb when running in parallel with a full Eclipse workspace rebuild, a CPU- and disk-intensive process. Results below, there are two measurements per item (this is Gutsy on a Pentium M 2GHz notebook, 7200RPM disk):
Build alone: 50s, 52s
Build with updatedb: 3min20s, 5min17s
Build with ionice -c3 updatedb: 4min30s, 2min44s
So there appears to be only a minimal improvement with ionice, if there is an improvement at all (given the variability of the result, I would have to perform more measurements per item).
The man page of ionice states that it works with the CFQ IO scheduler. How do I know which scheduler I am running, and how do I change it?
I think it would be really nice to solve this updatedb issue, as it really does give users a negative sensation. I use to completely disable updatedb when I install Ubuntu for non-geeks. Anyway, I think most non-geeks will never use locate...