Messages in this thread | | | Date | Wed, 26 May 2004 06:38:44 -0700 | From | William Lee Irwin III <> | Subject | Re: why swap at all? |
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On Wed, May 26, 2004 at 10:00:06PM +0900, Satoshi Oshima wrote: > I really agree. And I think swappoff is not enough. Some of my > customers have over 4GB of memory. RDMS, Java Virtual Machine or Grid > system (like Globus tool kit) run on the servers. Those kinds of > application make a lot of threads and they have huge amount of shared > memory. And those shared memory is sometimes mlocked. I think, in > those systems, memory aging itself is useless or obstructive in worst > case. Because mlocked pages which can't be swapped off are on the LRU > list. In such case, aging-off (relevant to process) is effective, I > think. Of course, I agree that swap-off or aging-off is NEVER always > useful. On the contrary, these functions may be required by very > small number of user. But it is very important that we can choose > how we use the OS.
Could you try CONFIG_SWAP=n to see if that makes a difference? More aggressive non-paging methods could be devised if not, e.g. CONFIG_MMU=n support of various kinds for hardware supporting paging and virtual memory (this is a suggestion, not an offer to implement).
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