Date: Wed, 16 May 2012 23:18:46 -0400 From: "b. f." <bf1783@googlemail.com> To: freebsd-current@FreeBSD.org Cc: Peter Jeremy <peter@rulingia.com> Subject: Re: "make delete-old" performance. Message-ID: <CAGFTUwPeOGgBqUt2gfeyvYr6W33hu1TQQBekj9_sVpmT7XoT_w@mail.gmail.com>
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> I recently ran "make delete-old" on a -current box and felt it was > rather slow. That prompted me to do some more careful experiments. > > On one box where I have both 8-stable and 9-stable available, there > was a ~30x slowdown (based on 5 runs, ignoring the first). I don't > have a -current world on that box so I can't directly compare but on > another pair of fairly similar boxes, I get a ~180x slowdown between > 8-stable and -current (and that figure is probably optimistic since > the -current box was idle whereas the 8-stable box was fairly busy). > > I realise that "make delete-old" isn't something you nede to do every > day but going from sub-second to multi-minute duration is quite > noticable. Can anyone suggest what has caused the change? The slowdown is probably due - at least in part - to two factors: - the list of files to be checked for removal has grown substantially, because missing entries for old knobs and new entries for new knobs have been added; and - a new (and slower) method of checking was added in: http://svnweb.FreeBSD.org/base?view=revision&revision=220255 because the old method broke down with the size of the new lists of files. Some changes could be made to lessen the affect of the latter. b.
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