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kokoko3k
n00b
Joined: 06 May 2005
Posts: 72
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 Posted: Thu Oct 16, 2008 8:49 am Post subject: 64bit vs 32bit memory footprint. |
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Hi all, i use two gentoo system,
- first one is a PIV@3.2ghz, 32bit which i use at work.
- second one is an amd64 venice which i use at home.
Both installations are nearly the same (same services, use flags, installed applications), but i noticed a bigger amount of ram used by the amd64 installation.
I know that 64bit code is more memory expansive than 32bit one because of pointer sizes, but here it is about a 20% more!
I'm not sure if this test is correct, but here's the output of pmap on a just opened bash shell.
32-bit:
| Code: |
32bitbox ~ # pmap 13987
13987: /bin/bash
08048000 608K r-x-- /bin/bash
080e0000 4K r---- /bin/bash
080e1000 20K rw--- /bin/bash
080e6000 2796K rw--- [ anon ]
41189000 120K r-x-- /lib/ld-2.7.so
411a7000 4K r---- /lib/ld-2.7.so
411a8000 4K rw--- /lib/ld-2.7.so
42543000 224K r-x-- /lib/libncurses.so.5.6
4257b000 28K r---- /lib/libncurses.so.5.6
42582000 8K rw--- /lib/libncurses.so.5.6
42584000 4K rw--- [ anon ]
42825000 1352K r-x-- /lib/libc-2.7.so
42977000 8K r---- /lib/libc-2.7.so
42979000 4K rw--- /lib/libc-2.7.so
4297a000 12K rw--- [ anon ]
429a8000 8K r-x-- /lib/libdl-2.7.so
429aa000 4K r---- /lib/libdl-2.7.so
429ab000 4K rw--- /lib/libdl-2.7.so
43726000 92K r-x-- /lib/libnsl-2.7.so
4373d000 4K r---- /lib/libnsl-2.7.so
4373e000 4K rw--- /lib/libnsl-2.7.so
4373f000 8K rw--- [ anon ]
b7daa000 36K r-x-- /lib/libnss_files-2.7.so
b7db3000 4K r---- /lib/libnss_files-2.7.so
b7db4000 4K rw--- /lib/libnss_files-2.7.so
b7db5000 36K r-x-- /lib/libnss_nis-2.7.so
b7dbe000 4K r---- /lib/libnss_nis-2.7.so
b7dbf000 4K rw--- /lib/libnss_nis-2.7.so
b7dc0000 28K r-x-- /lib/libnss_compat-2.7.so
b7dc7000 4K r---- /lib/libnss_compat-2.7.so
b7dc8000 4K rw--- /lib/libnss_compat-2.7.so
b7dc9000 1740K r---- /usr/lib/locale/locale-archive
b7f7c000 8K rw--- [ anon ]
b7f9d000 8K rw--- [ anon ]
b7f9f000 8K r-x-- /usr/lib/gconv/ISO8859-15.so
b7fa1000 4K r---- /usr/lib/gconv/ISO8859-15.so
b7fa2000 4K rw--- /usr/lib/gconv/ISO8859-15.so
b7fa3000 28K r--s- /usr/lib/gconv/gconv-modules.cache
b7faa000 4K r-x-- [ anon ]
bfe0d000 84K rw--- [ stack ]
[b] total 7332K[/b]
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64-bit:
| Code: |
64bitbox# pmap 7765
7765: -bash
0000000000400000 632K r-x-- /bin/bash
000000000059d000 44K rw--- /bin/bash
00000000005a8000 288K rw--- [ anon ]
00002b28104ad000 108K r-x-- /lib64/ld-2.7.so
00002b28104c8000 4K rw--- [ anon ]
00002b28104c9000 4K r---- /usr/lib64/locale/it_IT/LC_IDENTIFICATION
00002b28104ca000 4K r---- /usr/lib64/locale/it_IT/LC_MEASUREMENT
00002b28104cb000 4K r---- /usr/lib64/locale/it_IT/LC_TELEPHONE
00002b28104cc000 4K r---- /usr/lib64/locale/it_IT/LC_ADDRESS
00002b28104cd000 4K r---- /usr/lib64/locale/it_IT/LC_NAME
00002b28104ce000 4K r---- /usr/lib64/locale/it_IT/LC_PAPER
00002b28104cf000 4K r---- /usr/lib64/locale/it_IT/LC_MESSAGES/SYS_LC_MESSAGES
00002b28104d0000 4K r---- /usr/lib64/locale/it_IT/LC_MONETARY
00002b28104d1000 20K r---- /usr/lib64/locale/it_IT/LC_COLLATE
00002b28104d6000 4K r---- /usr/lib64/locale/it_IT/LC_TIME
00002b28104d7000 4K r---- /usr/lib64/locale/it_IT/LC_NUMERIC
00002b28104f5000 4K rw--- [ anon ]
00002b28104f6000 288K r-x-- /lib64/libncurses.so.5.6
00002b281053e000 1020K ----- /lib64/libncurses.so.5.6
00002b281063d000 60K rw--- /lib64/libncurses.so.5.6
00002b281064c000 216K r---- /usr/lib64/locale/it_IT/LC_CTYPE
00002b2810682000 28K r--s- /usr/lib64/gconv/gconv-modules.cache
00002b28106c7000 4K r---- /lib64/ld-2.7.so
00002b28106c8000 4K rw--- /lib64/ld-2.7.so
00002b28106c9000 8K r-x-- /lib64/libdl-2.7.so
00002b28106cb000 2048K ----- /lib64/libdl-2.7.so
00002b28108cb000 4K r---- /lib64/libdl-2.7.so
00002b28108cc000 4K rw--- /lib64/libdl-2.7.so
00002b28108cd000 1268K r-x-- /lib64/libc-2.7.so
00002b2810a0a000 2048K ----- /lib64/libc-2.7.so
00002b2810c0a000 16K r---- /lib64/libc-2.7.so
00002b2810c0e000 4K rw--- /lib64/libc-2.7.so
00002b2810c0f000 28K rw--- [ anon ]
00002b2810c16000 28K r-x-- /lib64/libnss_compat-2.7.so
00002b2810c1d000 2044K ----- /lib64/libnss_compat-2.7.so
00002b2810e1c000 4K r---- /lib64/libnss_compat-2.7.so
00002b2810e1d000 4K rw--- /lib64/libnss_compat-2.7.so
00002b2810e1e000 80K r-x-- /lib64/libnsl-2.7.so
00002b2810e32000 2044K ----- /lib64/libnsl-2.7.so
00002b2811031000 4K r---- /lib64/libnsl-2.7.so
00002b2811032000 4K rw--- /lib64/libnsl-2.7.so
00002b2811033000 8K rw--- [ anon ]
00002b2811035000 36K r-x-- /lib64/libnss_nis-2.7.so
00002b281103e000 2048K ----- /lib64/libnss_nis-2.7.so
00002b281123e000 4K r---- /lib64/libnss_nis-2.7.so
00002b281123f000 4K rw--- /lib64/libnss_nis-2.7.so
00002b2811240000 40K r-x-- /lib64/libnss_files-2.7.so
00002b281124a000 2044K ----- /lib64/libnss_files-2.7.so
00002b2811449000 4K r---- /lib64/libnss_files-2.7.so
00002b281144a000 4K rw--- /lib64/libnss_files-2.7.so
00002b281144b000 8K r-x-- /usr/lib64/gconv/ISO8859-1.so
00002b281144d000 2044K ----- /usr/lib64/gconv/ISO8859-1.so
00002b281164c000 4K r---- /usr/lib64/gconv/ISO8859-1.so
00002b281164d000 4K rw--- /usr/lib64/gconv/ISO8859-1.so
00002b281164e000 8K rw--- [ anon ]
00007fff9a5e7000 88K rw--- [ stack ]
ffffffffff600000 8192K ----- [ anon ]
[b] total 26940K[/b]
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Here are emerge --info on
32bit: http://pastebin.com/f7d8e500d
64bit: http://pastebin.com/ff203a6f
I wonder if i can do something (kernel configuration, cflags, glibc use flags...) to reduce the 64-bit memory footprint.
Thanks in advance. |
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zyko
l33t
Joined: 01 Jun 2008
Posts: 620
Location: Munich, Germany
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| Posted: Thu Oct 16, 2008 9:58 am Post subject: |
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| Quote: | | but here it is about a 20% more! |
That is consistent with my experiences: amd64 is at least 20% larger than i686. I don't think there's anything that can be done, especially since you already seem to have things compiled with -Os. |
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