RE: Getting rid of SHMMAX/SHMALL ?

[Chen, Kenneth W]

Andi Kleen wrote on Thursday, August 04, 2005 6:24 AM
> I think we should just get rid of the per process limit and keep
> the global limit, but make it auto tuning based on available memory.
> That is still not very nice because that would likely keep it < available 
> memory/2, but I suspect databases usually want more than that. So
> I would even make it bigger than tmpfs for reasonably big machines.
> Let's say
> 
> if (main memory >= 1GB)
> 	maxmem = main memory - main memory/8 

This might be too low on large system.  We usually stress shm pretty hard
for db application and usually use more than 87% of total memory in just
one shm segment.  So I prefer either no limit or a tunable.

- Ken

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