David Tonhofer, m-plify S.A. wrote:
So - what should I test next to track this down? Also - if I set MaxRequestsPerChild to 30 - it quickly fills up another gig of ram. It's currently set at 10.--On Friday, October 21, 2005 11:16 AM -0700 Marc Perkel <marc@xxxxxxxxxx> wrote:David Tonhofer, m-plify S.A. wrote:I really don't know what the problem could be but let's start a discussion: 1) How many children are there? 2) What is the sum of the processes RSS size? 3) What is the sum of the processes VSIZE size?Thanks for your perl script. Here's the results: 1029308 minor faults so far 227 major faults so far 1532 user time jiffies burnt so far 25812 kernel time jiffies burnt so far 55062589440 bytes of allocated virtual memory 9328185344 bytes of resident memory allocated 294 children active right now Excuse my ignorance but what does the mean? Thanks in advanceWell, "minor faults"/"major faults" are about paging (if I remember correctly, a minor fault means "page has to be read from disk, scratching a page in memory" and major fault means "page has to be read from disk, but before that an existing page has to be written") The jiffies express how many CPU has been used on the program, they used to be 1/100 of second units, not sure whether that still holds. What is interesting here is:55'062'589'440 bytes of allocated virtual memory 9'328'185'344 bytes of resident memory allocatedThe first number is just the sum of the processes' virtual memory size - they indicate that they want 55 GByte in toto, but this being just 'virtual', it's not a problem. The second number is the sum of the processes' effective memory size - 9 GByte of RAM... more than you actually have? (scratches head) That shouldn't be possible, except if some RAM is counted twice. Damn. Here are my number (light charge on an dual XEON on RH ES4, only static serves, some PHP though but mostly Tomcat running the show): 87862 minor faults so far 9291 major faults so far 869 user time jiffies burnt so far 379 kernel time jiffies burnt so far 1271640064 bytes of allocated virtual memory 50085888 bytes of resident memory allocated 10 children active right now Acid test: ~ 5 MByte resident memory per child for me ~31 MByte resident memory per child for you This does not sound too unreasonable if there is a lot of Perl going on. We need more numbers...
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