apache (httpd) on FC1/i386 vs FC2/x86_64: 3-8 times as much memory consumption?

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Hi,

I recently moved a httpd mirror from i386 to x86_64 hardware. All but
the memory capacity were scaled up (100MBit to 1GBit, Athlon to
Opteron etc.).

The old server is running FC1/i386 and the new one got
FC2/x86_64. Although both distros have httpd in the same upstream
version (2.0.50) the memory footage is quite different, and leads to
the striking of the oom-killer on the new server:

old (FC1/i386):

root      3329  0.0  0.2 26900 2408 ?        S    Aug29   0:01 /usr/sbin/httpd
apache   32746  0.0  0.5 28388 5984 ?        S    06:01   0:03  \_ /usr/sbin/httpd
apache    6206  0.0  0.5 28320 5968 ?        S    09:31   0:02  \_ /usr/sbin/httpd
apache    8185  0.0  0.5 28452 6080 ?        S    10:09   0:04  \_ /usr/sbin/httpd
apache   10293  0.0  0.5 28452 6056 ?        S    11:07   0:03  \_ /usr/sbin/httpd
apache   10378  0.0  0.5 28396 5984 ?        S    11:09   0:03  \_ /usr/sbin/httpd
[...]

new (FC2/x86_64):

root      2177  0.0  1.5 189664 15556 ?      S    Aug30   0:00 /usr/sbin/httpd
apache    2273  0.0  1.7 193076 17984 ?      S    Aug30   0:03  \_ /usr/sbin/httpd
apache    2282  0.0  1.7 193052 17996 ?      S    Aug30   0:04  \_ /usr/sbin/httpd
apache    3125  0.0  1.7 193052 17992 ?      S    Aug30   0:03  \_ /usr/sbin/httpd
apache    3993  0.0  1.7 193052 18060 ?      S    01:27   0:03  \_ /usr/sbin/httpd
apache    3994  0.0  1.7 193052 17976 ?      S    01:27   0:02  \_ /usr/sbin/httpd
apache    7193  0.0  1.7 193052 17992 ?      S    05:01   0:02  \_ /usr/sbin/httpd

Is this normal for i386 -> x86_64? Anyone running httpd on x86_64 to
compare numbers?

Thanks!
-- 
Axel.Thimm at ATrpms.net

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