Re: -mm merge plans for 2.6.23

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On Wed, 25 Jul 2007, Rene Herman wrote:

On 07/25/2007 06:46 AM, [email protected] wrote:

 you could make a synthetic test by writing a memory hog that allocates 3/4
 of your ram then pauses waiting for input and then randomly accesses the
 memory for a while (say randomly accessing 2x # of pages allocated) and
 then pausing again before repeating

Something like this?

 run two of these, alternating which one is running at any one time. time
 how long it takes to do the random accesses.

 the difference in this time should be a fair example of how much it would
 impact the user.

Notenotenote, not sure what you're going to show with it (times are simply as horrendous as I'd expect) but thought I'd try to inject something other than steaming cups of 4-letter beverages.

when the swap readahead is enabled does it make a significant difference in the time to do the random access?

if it does that should show a direct benifit of the patch in a simulation of a relativly common workflow (startup a memory hog like openoffice then try and go back to your prior work)

David Lang

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