How can the performance of multiple swap partitions be tuned?

Updated -

If a system is configured with several swap partitions, the default behaviour is to make use of one partition at a time. Once one swap partition has been exhausted the next will be used.

This is not always the best method for performance, since when a new process needs to be swapped to disk it may be forced to wait until another process is swapped out.

The swap usage can be tuned...

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