Mark Barnes wrote:
I don't think that much swap in a single partition is being fully
used.
Nobody, but nobody, needs 1GB for a swap :-) (somebody will now tell me
how they DO :-) )
As I understand it, linux can use a maximum of (I think) 128 mb
per swap partition. If you want more than 128 mb swap, you'll need to
> create additional swap partitions. This doesn't really get at your
> performance problems, but no more than 128 mb out of that huge swap
> partition can be used.
That is true only of 'old-style' swap spaces. From man mkswap: "an old
style swap area can describe at most 8*(S-10)-1 pages used for swapping.
With S=4096 (as on i386), the useful area is at most 133890048 bytes
(almost 128 MiB), and the rest is wasted". Note that even then, that
only applies to systems with a 4K page size. I have a 126MB and a 300MB
partition, then I use swapd to create 64MB swap files as needed, and
when doing Oracle installs I have fully used both of the partitions plus
3 or 4 swapd files.
Since the Oracle install fails completely silently if it runs out of
memory, I've needed to keep a close eye on the swap use.
--
derek
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