| Subject | Re: [patch] vmfixes-2.4.0-test9-B2 - fixing deadlocks | From | Christoph Rohland <> | Date | 27 Sep 2000 18:56:42 +0200 |
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Andrea Arcangeli <andrea@suse.de> writes:
> On Wed, Sep 27, 2000 at 10:11:43AM +0200, Christoph Rohland wrote: > > I just checked one oracle system and it did not lock the memory. And I > > If that memory is used for I/O cache then such memory should > released when the system runs into swap instead of swapping it out > too (otherwise it's not cache anymore and it could be slower than > re-reading from disk the real data in rawio).
Yes, but how does the application detect that it should free the mem? Also you often have more overhead reading out of a database then having preprocessed data in swap.
> > Customers with performance problems very often start with too little > > memory, but they cannot upgrade until this really big job finishes :-( > > > > Another issue about shm swapping is interactive transactions, where > > some users have very large contexts and go for a coffee before > > submitting. This memory can be swapped. > > Agreed, that's why I said shm performance under swap is very important > as well (I'm not understimating it).
fine :-)
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