Re: Large Pages - Linux Foundation HPC

[Christoph Lameter]

On Sat, 25 Apr 2009, Dave Hansen wrote:

> On Sat, 2009-04-25 at 16:48 +0800, Wu Fengguang wrote:
> > Based on Dave's descriptions that HPC apps typically
> > - do mlock(), to pre-populate memory and pin them in memory
> > - run at fresh boot, with loads of high order pages available
>
> There are definitely some of them that do this, but it certainly isn't
> all.  It may not even be the norm.

Some of the machine have so much memory available that 2M allocations are
likely to succeed. If a machine has a couple of terabytes of memory
available then its highly unlikely that a 2M allocation will not succeed.

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