On Fri, 31 Mar 2000, Marco Colombo wrote:
> On the other side, you know most of the processes you're going to run
> have a large address spaces but a small working-sets. Here your VM is
> mostly swap, so suppose you have 64MB of RAM and 256MB of swap.
> On sych a system, RAM is used always as a kind of cache, for process pages.
> (Of course, it's used as a cache for FS blocks, too).
> If you let processes allocate more that 256MB of VM, you're reducing
> the cache size, and effectiveness. On such a system it makes sense
> NOT to include RAM in the VM counts (just like you don't include RAM
> in counts for available disk space...).
Indeed. We _need_ memory for the kernel and for caching of
executables. Maybe we should reserve something like
min(ram_size / 2, swap_size / 2) for kernel memory and
cache...
regards,
Rik
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This archive was generated by hypermail 2b29 : Fri Mar 31 2000 - 21:00:29 EST