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SubjectRe: 2.4.19rc2aa1 VM too aggressive?
On Fri, Jul 19, 2002 at 05:45:21PM -0400, Johannes Erdfelt wrote:
> On Fri, Jul 19, 2002, Mark Hahn <hahn@physics.mcmaster.ca> wrote:
> > > > > procs memory swap io system cpu
> > > > > r b w swpd free buff cache si so bi bo in cs us sy id
> > > > > 3 0 0 106036 502288 10812 67236 0 0 0 0 802 494 46 37 17
> > > > > 5 0 2 106032 476188 10844 91496 0 0 4 316 905 573 54 37 8
> > > > > 16 0 2 106032 355400 10844 203880 0 0 4 0 909 540 51 49 0
> > > > > 10 0 2 106024 340108 10852 221548 0 0 28 0 975 659 36 64 0
> > > > > 0 0 0 106024 528340 10852 43572 0 0 4 0 569 426 17 17 67
> > > > > 0 1 0 106024 531304 10852 43612 0 0 4 0 542 342 9 14 77
> > ..
> > > What's really odd in the vmstat output is the fact that there is no disk
> > > I/O that follows these wild swings. Where is this cache memory coming
> > > from? Or is the accounting just wrong?
> >
> > you're right, the jump up makes no sense. if fork was increasing cached-page
> > counters even for cloned pages, that might explain it (and be a bug).
>
> procs memory swap io system cpu
> r b w swpd free buff cache si so bi bo in cs us sy id
> 12 0 1 151664 365212 11216 201528 12 0 96 0 747 557 37 62 1
> 7 0 1 151540 425468 11216 146308 0 0 0 0 904 620 45 55 0
> 0 0 0 151540 540884 11216 37828 0 0 8 0 593 376 12 32 57
> 2 0 0 151528 533160 11240 44264 0 0 0 284 511 379 14 20 66
> 0 0 0 151496 540380 11240 37860 8 0 36 0 555 406 16 11 73
> 0 0 0 151496 540296 11240 37928 0 0 60 0 438 341 19 45 36
> 0 0 0 151464 540124 11244 37996 0 0 64 0 408 296 9 2 89
> 3 0 0 151456 503868 11252 71840 0 0 52 0 630 434 29 32 39
> 15 0 1 151344 416060 11284 151764 8 0 32 296 854 568 50 47 2
> 19 0 1 151296 335576 11284 226012 0 0 0 0 830 584 49 51 0
> 20 0 1 151208 286524 11284 268620 0 0 0 0 980 593 60 40 0
> 10 0 1 150652 451832 11324 119612 16 0 268 272 4815 3162 39 61 0
> 13 0 4 149660 475196 11348 93836 28 0 68 292 1178 889 51 39 10
> 15 0 1 149252 105568 11412 447892 116 0 648 284 5491 3849 40 60 0
> 6 0 0 149252 536052 11424 39132 0 0 56 0 700 527 15 80 5
> 5 0 1 149072 487304 11436 84188 8 0 108 0 966 648 47 52 1
> 3 0 0 148984 485116 11440 87760 32 0 100 0 749 512 39 61 0
> 0 0 0 148932 536436 11468 39324 0 0 24 304 593 385 19 13 68
>
> It's constantly happening too. Like every couple of minutes.
>
> Andrea, any idea what the cause of these fluctuations are?

shared memory? it looks all right. Please try to monitor the shm usage
as root with ipcs and ls -l /dev/shm.

Andrea
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