Messages in this thread | | | Date | Sun, 28 Sep 2003 19:54:07 +0200 | From | "Ihar 'Philips' Filipau" <> | Subject | Re: [OT] No Swap. Re: [BUG 2.6.90-test5] kernel shits itself with 48mb ram under moderate load |
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Mikulas Patocka wrote: > >>> >>>Yes, it should. If you have 0.25GB, it can be copied into cache. If you >>>have 0.125GB, it doesn't fit there. >> >> So you want to say to effectively copy (or whatever) 40GB harddrive I >>have to have 40GB of RAM? Ridiculous. > > Other unices (Solaris, IRIX) don't have dynamic cache that resizes > according to RAM, always copy data from disk to disk and so they are
It is slow. But when someone compile something on our Linux cross compilation server - everyone else is out - "jerky" is not suffieciently hard word to describe how it works under load. (I hope 2.6 fixes this.)
Sun Ultra 10 (Solaris 8) is magnitude slower, but when someone compiles something big - people still _*can*_ work on it. "find | xargs grep" is still ok. I notice usually background compilations by fact that :w takes visibly longer. But I can work.
That's what matters. Try to work in vim if it is permanently get swaped out. _*Very*_ _*very*_ not nice. And there is no memory pressure - kernel just decided to enlarge I/O cache... 100% stupid.
I personally prefer to have statical I/O cache - never saw it working reliably with dynamic allocation.
> order-of-magnitude slower than Linux. Did you ever tried to grep for > symbols in linux source tree unpacked on Solaris box with 512MB RAM? --- > it's just as slow as linux with very few RAM, because Solaris can't cache > data in RAM. >
-- Ihar 'Philips' Filipau / with best regards from Saarbruecken. -- "... and for $64000 question, could you get yourself vaguely familiar with the notion of on-topic posting?" -- Al Viro @ LKML
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