Looking for some explanation (and verification) as to why the virtual memory increases by 5 fold (at the minimum) from 32 bit to 64 systems. I'm aware (for the most part) of the int, struct, etc changes from 32 to 64 bit. Results from running `php -r 'sleep(1000);' &` on 32 and 64 bit systems are below. PHP was built by hand.
32 bit
System => Linux kronos 2.6.18-194.el5 #1 SMP Tue Mar 16 21:52:43 EDT 2010 i686
Build Date => Sep 22 2011 08:50:40
Configure Command => './configure' '--prefix=/opt/php'
Test: php -r 'sleep(1000);' &
root 4863 0.0 0.1 7064 1064 ? Ss 08:21 0:00 /usr/sbin/sshd
root 5403 0.0 1.0 17736 11048 ? Ss 08:28 0:00 \_ sshd: root@pts/1
root 5418 0.0 0.1 4540 1488 pts/1 Ss 08:28 0:00 \_ -bash
root 2340 0.0 0.3 13240 3288 pts/1 S 08:53 0:00 \_ /opt/php/bin/php -r sleep(1000);
root 2341 0.0 0.0 4224 872 pts/1 R+ 08:53 0:00 \_ ps axuf
64 bit
System => Linux ceous 2.6.18-194.el5 #1 SMP Tue Mar 16 21:52:39 EDT 2010 x86_64
Build Date => Sep 22 2011 08:51:02
Configure Command => './configure' '--prefix=/opt/php'
Test: php -r 'sleep(1000);' &
root 5181 0.0 0.1 62608 1220 ? Ss 08:22 0:00 /usr/sbin/sshd
root 5724 0.0 1.5 102020 15620 ? Ss 08:27 0:00 \_ sshd: root@pts/1
root 5726 0.0 0.1 66064 1608 pts/1 Ss 08:28 0:00 \_ -bash
root 2019 0.0 0.4 88864 4200 pts/1 S 08:54 0:00 \_ /opt/php/bin/php -r sleep(1000);
root 2021 0.0 0.0 65592 924 pts/1 R+ 08:54 0:00 \_ ps axuf
32 v. 64 virtual memory difference: 75624
Thanks!
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