Messages in this thread | | | From | Al Boldi <> | Subject | Re: [patch][rfc] quell interactive feeding frenzy | Date | Sat, 15 Apr 2006 23:45:39 +0300 |
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Con Kolivas wrote: > On Friday 14 April 2006 13:16, Al Boldi wrote: > > Can you try the attached mem-eater passing it the number of kb to be > > eaten. > > > > i.e. '# while :; do ./eatm 9999 ; done' > > > > This will print the number of bytes eaten and the timing in ms. > > > > Assuming timeslice=100, adjust the number of kb to be eaten such that > > the timing will be less than timeslice (something like 60ms). Switch to > > another vt and start another eatm w/ the number of kb yielding more than > > timeslice (something like 140ms). This eatm should starve completely > > after exceeding timeslice. > > > > This problem also exists in mainline, but it is able to break out of it > > to some extent. Setting eatm kb to a timing larger than timeslice does > > not exhibit this problem. > > Thanks for bringing this to my attention. A while back I had different > management of forked tasks and merged it with PF_NONSLEEP. Since then I've > changed the management of NONSLEEP tasks and didn't realise it had > adversely affected the accounting of forking tasks. This patch should > rectify it.
Congrats!
Much smoother, but I still get this choke w/ 2 eatm 9999 loops running:
9 MB 783 KB eaten in 131 msec (74 MB/s) 9 MB 783 KB eaten in 129 msec (75 MB/s) 9 MB 783 KB eaten in 129 msec (75 MB/s) 9 MB 783 KB eaten in 131 msec (74 MB/s) 9 MB 783 KB eaten in 133 msec (73 MB/s) 9 MB 783 KB eaten in 132 msec (73 MB/s) 9 MB 783 KB eaten in 128 msec (76 MB/s) 9 MB 783 KB eaten in 133 msec (73 MB/s) 9 MB 783 KB eaten in 129 msec (75 MB/s) 9 MB 783 KB eaten in 130 msec (74 MB/s) 9 MB 783 KB eaten in 2416 msec (3 MB/s) <<<<<<<<<<<<< 9 MB 783 KB eaten in 197 msec (48 MB/s) 9 MB 783 KB eaten in 133 msec (73 MB/s) 9 MB 783 KB eaten in 132 msec (73 MB/s) 9 MB 783 KB eaten in 132 msec (73 MB/s) 9 MB 783 KB eaten in 126 msec (77 MB/s) 9 MB 783 KB eaten in 135 msec (72 MB/s) 9 MB 783 KB eaten in 132 msec (73 MB/s) 9 MB 783 KB eaten in 132 msec (73 MB/s) 9 MB 783 KB eaten in 134 msec (72 MB/s) 9 MB 783 KB eaten in 64 msec (152 MB/s) 9 MB 783 KB eaten in 63 msec (154 MB/s) 9 MB 783 KB eaten in 63 msec (154 MB/s) 9 MB 783 KB eaten in 63 msec (154 MB/s) 9 MB 783 KB eaten in 63 msec (154 MB/s) 9 MB 783 KB eaten in 64 msec (152 MB/s) 9 MB 783 KB eaten in 63 msec (154 MB/s) 9 MB 783 KB eaten in 64 msec (152 MB/s) 9 MB 783 KB eaten in 63 msec (154 MB/s) 9 MB 783 KB eaten in 63 msec (154 MB/s) 9 MB 783 KB eaten in 63 msec (154 MB/s) 9 MB 783 KB eaten in 63 msec (154 MB/s) 9 MB 783 KB eaten in 63 msec (154 MB/s)
You may have to adjust the kb to get the same effect.
Thanks!
-- Al
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