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Date:      Fri, 27 Aug 1999 04:55:42 +0900
From:      chas <panda@skinnyhippo.com>
To:        freebsd-isp@freebsd.org
Subject:   Memory leak ? Inact memory never gets freed.
Message-ID:  <3.0.5.32.19990827045542.0094c9b0@mail.skinnyhippo.com>
In-Reply-To: <3.0.5.32.19990826115729.009454d0@mail.skinnyhippo.com>

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The 'free' memory on our machine has just gone down steadily over
the past 24 hours as the following (in chronological order) shows :


Yesterday 04:00 Hrs 
~~~~~~~~~~~~~~~~~~~
I remember there was 470 MB free 
but don't have the 'top' output.


10:00 Hrs (moderate-high load) : 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
last pid: 36826;  load averages:  0.15,  0.31,  0.33      
131 processes: 1 running, 130 sleeping
CPU states:  0.4% user,  0.0% nice,  0.0% system,  0.4% interrupt, 99.2% idle
Mem: 28M Active, 218M Inact, 22M Wired, 20M Cache, 8348K Buf, 214M Free
Swap: 700M Total, 700M Free


16:00 Hrs (peak load) :
~~~~~~~~~~~~~~~~~~~~~~~
last pid: 98274;  load averages:  0.84,  0.76,  0.67  
142 processes: 1 running, 135 sleeping, 6 zombie
CPU states: 48.2% user,  0.0% nice, 15.6% system,  0.0% interrupt, 36.2% idle
Mem: 31M Active, 307M Inact, 23M Wired, 20M Cache, 8345K Buf, 122M Free
Swap: 700M Total, 700M Free


03:45 Hrs (low traffic) :
~~~~~~~~~~~~~~~~~~~~~~~~~
last pid: 79900;  load averages:  0.00,  0.01,  0.00   up 0+23:03:45  03:44:41
40 processes:  1 running, 39 sleeping
CPU states:  0.4% user,  0.0% nice,  0.8% system,  0.0% interrupt, 98.8% idle
Mem: 19M Active, 431M Inact, 22M Wired, 13M Cache, 8346K Buf, 16M Free
Swap: 700M Total, 700M Free

It should have freed up memory since there's virtually zero load
on the server right now. 


04:00 Hrs (restart) :
~~~~~~~~~~~~~~~~~~~~~
Expecting yet another heavy day tomorrow, I figured I'd better restart
the machine to free up the memory again; having done that, memory is 
looking good again - 470 MB free once more.

last pid:   380;  load averages:  0.07,  0.04,  0.00   up 0+00:06:44  04:01:31
35 processes:  1 running, 34 sleeping
CPU states:  0.4% user,  0.0% nice,  0.0% system,  0.0% interrupt, 99.6% idle
Mem: 7540K Active, 7012K Inact, 17M Wired, 8339K Buf, 471M Free
Swap: 700M Total, 700M Free



The server is running apache and mysql; 1.5+ million hits/day (180,000 
page views of which 100,000+ are dynamically generated using simple cgi 
scripts using python).  If it is indeed a memory leak, how can I diagnose
what it is due to ? and how can I cure it ? 

Thank you very much,

chas





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