Messages in this thread | | | Date | Tue, 03 Feb 2004 14:52:20 +1100 | From | Nick Piggin <> | Subject | Re: 2.6.1 slower than 2.4, smp/scsi/sw-raid/reiserfs |
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Philip Martin wrote:
>Nick Piggin <piggin@cyberone.com.au> writes: > > > >>Philip Martin wrote: >> >> >> >>>Nick Piggin <piggin@cyberone.com.au> writes: >>> >>> >>>>When the build finishes and there is no other activity, can you >>>>try applying anonymous memory pressure until it starts swapping >>>>to see if everything gets reclaimed properly? >>>> >>>> >>>How do I apply anonymous memory pressure? >>> >>> >>Well just run something that uses a lot of memory and doesn't >>do much else. Run a few of these if you like: >> >>#include <stdlib.h> >>#include <unistd.h> >>#define MEMSZ (64 * 1024 * 1024) >>int main(void) >>{ >> int i; >> char *mem = malloc(MEMSZ); >> for (i = 0; i < MEMSZ; i+=4096) >> mem[i] = i; >> sleep(60); >> return 0; >>} >> >> > >This is what free reports after the build > > total used free shared buffers cached >Mem: 516396 215328 301068 0 85084 68364 >-/+ buffers/cache: 61880 454516 >Swap: 1156664 40280 1116384 > >then after starting 10 instances of the above program > > total used free shared buffers cached >Mem: 516396 513028 3368 0 596 5544 >-/+ buffers/cache: 506888 9508 >Swap: 1156664 320592 836072 > >and then after those programs finish > > total used free shared buffers cached >Mem: 516396 35848 480548 0 964 5720 >-/+ buffers/cache: 29164 487232 >Swap: 1156664 54356 1102308 > >It looks OK to me. > > >
Yeah thats looks fine. It was a wild guess.
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