[Beowulf] Re: Feedback on large pages in Linux (hahn at physics.mcmaster.ca)
greg.lindahl at qlogic.com
Fri Jul 28 22:29:38 PDT 2006
On Wed, Jul 26, 2006 at 06:55:29PM -0400, Robert G. Brown wrote:
> Isn't there a fairly general rule of thumb, that systems that get a
> large benefit from streaming I/O through a cache of any size pay a
> penalty in terms of repeated flushes for sufficiently NON-streaming
> (random or variable stride) I/O?
Uh, yeah. However, in a system with multiple page sizes, nobody says
that you have to use the large size for your file mmaps or I/O.
Paging is also less efficient with large pages, but modern systems
don't page much.
BTW, you should warn me when you invoke my name at the end of a long
post, it's not like I'm as omniscient as Kibo...
> (working for a compiler company, after all;-)...
... did a lot more work on the interconnect. Maybe I just suffer from
Male Answer Syndrome?
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