Re: crm memory usage

On Tue, Jul 07, 2009 at 08:58:24AM -0400, Bill Yerazunis
wrote:
> It shouldn't, under Linux at least.  "Fork" modifies the
> page table so that the pages aren't copied immediately-
> they're shared and only copied when one of the copies is
> written to.

Is anyone clear whether this holds when you set
vm_overcommit to 2? This makes the linux VM strict about
overcommitting memory and instead of allowing it (and
hoping it frees up pages before the memory gets
referenced), mallocs start returning NULL.

I'm wondering whether the CoW feature of forks falls into
this strict behaviour. It's recommended to turn this on (and
add LOTS of swap) to VMs that have tight memory constraints
by my VPS provider at least.


-- 
Jon Dowland

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