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Thread: amavisd-new memory usage on 32bit vs 64bit OS: factor of 2+ - why?




amavisd-new memory usage on 32bit vs 64bit OS: factor of 2+ - why?
user name
2007-07-08 18:15:13
Hi,

I just noticed that two almost identical amavisd-new
installations have
wildly different memory usages.

The only difference is that one system is i386, whereas the
other amd64.

On i386, top reports:

 VIRT  RES  SHR CODE DATA SWAP nFLT %MEM   TIME+  COMMAND
58660  52m 5176 1024  46m 4700    9  5.3  0:01.94 amavisd
(master)
59428  49m 1468 1024  46m 9176    0  4.9  0:00.00 amavisd
(virgin child)
59428  49m 1440 1024  46m 9204    0  4.9  0:00.01 amavisd
(virgin child)
59428  49m 1464 1024  46m 9180    0  4.9  0:00.01 amavisd
(virgin child)

Whereas on amd64:

 VIRT  RES  SHR CODE DATA SWAP nFLT %MEM   TIME+  COMMAND
 164m  95m 9016   12  83m  68m   12  9.5  0:02.93 amavisd
(master)
 165m  88m 1408   12  83m  77m    0  8.8  0:00.01 amavisd
(virgin child)
 165m  88m 1400   12  83m  77m    0  8.8  0:00.01 amavisd
(virgin child)
 165m  88m 1372   12  83m  77m    0  8.8  0:00.01 amavisd
(virgin child)

Both were started a few minutes ago, so the difference isn't
caused by the
64bit version having been running for a long time.

I'm having a hard time accepting this difference as normal.

Maybe this is a bug in perl?

i386:  This is perl, v5.8.8 built for
i486-linux-gnu-thread-multi
amd64: This is perl, v5.8.8 built for
x86_64-linux-gnu-thread-multi

My amavisd-new version is 2.5.2-rc1, and I have the qmqpqq
patch applied.

Andras

-- 
                 Andras Korn <korn at
chardonnay.math.bme.hu>
                 <http://chard
onnay.math.bme.hu/~korn/>	QOTD:
                A stitch in time would have confused
Einstein.

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