Re: Make pipe data structure be a circular list of pages, ratherthan

[Diego Calleja]

El Fri, 7 Jan 2005 13:59:53 -0800 (PST) Linus Torvalds <torvalds@xxxxxxxx> escribió:

> Btw, from limited testing this effect seems to be much more pronounced on
> SMP.

I've tried it in a 2xPIII, 512 MB of ram. I've done kernel compiles...yeah
yeah I know kernel compiles are not a good benchmark but since linux uses
-pipe for gcc...I though it may try it to see if it makes a difference
(suggestions about better methods to test this are accepted :). The results
could be very well stadistical noise (it looks like it only takes a second less
on average), but I though it may be interesting.


without the patch:
952.84user 98.64system 8:54.64elapsed 196%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+7318007minor)pagefaults 0swaps
951.78user 98.25system 8:53.71elapsed 196%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+7318009minor)pagefaults 0swaps
954.53user 99.12system 8:53.02elapsed 197%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+7318041minor)pagefaults 0swaps

with it:
951.67user 97.59system 8:53.12elapsed 196%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+7318010minor)pagefaults 0swaps
949.04user 97.68system 8:52.04elapsed 196%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+7318018minor)pagefaults 0swaps
948.40user 97.37system 8:51.48elapsed 196%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+7318011minor)pagefaults 0swaps
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