apache (httpd) on FC1/i386 vs FC2/x86_64: 3-8 times as much memory consumption?
Joe Orton
jorton at redhat.com
Thu Sep 2 20:23:10 UTC 2004
On Tue, Aug 31, 2004 at 04:05:50PM +0200, Axel Thimm wrote:
> 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:
I see the same thing here, not looked into it before though.
It's interesting, if you look at the mappings of the httpd process on
x86_64, for each mmaped object there is an extra region mapped with
PROT_NONE, which you don't see on i686. I presume this is counted in
the VmSize calculation - it adds up to about 100Mb of address space on
the system I tested.
e.g.
2a9b033000 12K r-xp /usr/lib64/libpanel.so.5.3
2a9b036000 1012K ---p /usr/lib64/libpanel.so.5.3
2a9b133000 16K rw-p /usr/lib64/libpanel.so.5.3
vs
00d57000 12K r-xp /usr/lib/libpanel.so.5.3
00d5a000 4K rw-p /usr/lib/libpanel.so.5.3
is this libc behaviour by design? Jakub?
>
> 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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