Messages in this thread | | | Date | Tue, 05 Nov 2002 16:57:47 -0800 | From | "Martin J. Bligh" <> | Subject | Re: ps performance sucks (was Re: dcache_rcu [performance results]) |
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>> The locking of walking the tasklist seems non-trivial, but we may well >> end up with something like that. By the time you finish, it looks more >> like a /dev device thing than /proc (which I'm fine with), and looks > > Can people just oprofile this instead of guessing? Opening a file is not > very expensive anymore, so if ps is noticeably slow, it must be something > else. > > 'To measure is to know'
Errm... we have profiled it. Look at the subject line ... this started off as a dcache_rcu discussion. The dcache lookup ain't cheap, for starters, but that's not really the problem ... it's O(number of tasks), which sucks.
M.
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