<html><head><meta http-equiv="Content-Type" content="text/html charset=iso-8859-1"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div>On Jun 5, 2013, at 9:17 PM, Thomas R Gissel <<a href="mailto:gissel@us.ibm.com">gissel@us.ibm.com</a>> wrote:</div><blockquote type="cite"><div><p><font size="3" face="Tahoma">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...). </font></p></div></blockquote></div><div>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.</div><div><br></div><div>Thanks,</div><div>Jason</div></body></html>