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Subject: Re: [OMPI devel] SM init failures
From: Iain Bason (Iain.Bason_at_[hidden])
Date: 2009-03-30 13:24:13

On Mar 30, 2009, at 12:05 PM, Jeff Squyres wrote:

> But don't we need the whole area to be zero filled?

It will be zero-filled on demand using the lseek/touch method.
However, the OS may not reserve space for the skipped pages or disk
blocks. Thus one could still get out of memory or file system full
errors at arbitrary points. Presumably one could also get segfaults
from an mmap'ed segment whose pages couldn't be allocated when the
demand came.