Jonathan Tweed wrote:
www 60645 0.0 5.8 73068 60504 ?? S 8:25PM 0:00.00
/usr/local/sbin/httpd
mean that 73068 - 60504 = 12564 is shared (at least according to ps)?
No, thats supposed to be ~73MB is the address space mapped by the process
~60MB is actually resident in memory. The busier your server the closer this
number will get to matching each oterh.
Assuming you've got 100% sharing, you take the parent size which should stay
near perfect
and substract that from your child size.
Or you use Linux::Smaps, or getrusage(3), or GTOP
in actuality, you'll probably get 40-60% sharing on a good day after some use.
You can guess at this number if you can't use any of these tools --
Ask yourself this question, how much memory _MUST_ be shared or I would be
swaping ?
Assuming you have enough children to max the box out.
The only number in FreeBSD I know of that *should* actually reflect something
near this is
ru_ixrss an ``integral'' value indicating the amount of memory used
by the text segment that was also shared among other pro-
cesses. This value is expressed in units of kilobytes *
ticks-of-execution. Ticks are statistics clock ticks. The
statistics clock has a frequency of sysconf(_SC_CLK_TCK)
ticks per second.
from getrusage (3)
also remember the units ARE NOT the same as
ru_maxrss the maximum resident set size utilized (in kilobytes).
despite every BSD's manpage getting it wrong.
one is in Bytes the other in KiloBytes.
For instance I run a QEMU based VM on FreeBSD
root 77406 91.8 33.0 1086556 342588 p3- R 16Aug06 9514:55.14 qemu
This also makes sense because I've only 1GB of physical RAM on this box
(different box from the httpd one).
I've told it it an use 1024MB of memory (1086556) at current however, its only
got
342588 (342MB) of it in Physical RAM the rest is unused at the moment.
For httpd this difference is much lower because it needs more in RAM to do stuff
and sizes are much smaller.
If it was me, I would do NO MEMORY STATS on OSX any version -- other then rough
total process size.
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