High amount of private clean data in smaps

Jason Evans jasone at canonware.com
Wed Jun 5 22:34:57 PDT 2013

On Jun 5, 2013, at 9:17 PM, Thomas R Gissel <gissel at us.ibm.com> wrote:
> I too have been trying to reproduce the existence of Private_Clean memory segments in smaps via a simple test case with jemalloc and was unable to on my laptop, a 2 core machine running a 3.8.0-23 kernel .  I then moved my test to our production box: 96GB memory, 24 hardware threads and 2.6 kernel (detailed information below), and within a few minutes of execution, with a few minor adjustments, I was able duplicate the results, smaps showing the jemalloc segment with Private_Clean memory usage, of our larger test. Note that I'm using the same jemalloc library whose information Kurtis posted earlier (96 arenas etc...). 

Interesting!  I don't see anything unusual about the test program, so I'm guessing this is kernel-specific.  I'll run it on some 8- and 16-core machines tomorrow with a couple of kernel versions and see what happens.

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