Re: Swap or I/O Improvement in Fedora 8?

Hi,

I just have a few preliminary findings in running a large application using
16GB memory.

On Fedora 8 (Kernel 2.6.23-1.42), it runs using less than 2 hours to
complete only when
I first login as root, and then "su" to a normal user to run the program.
However, if I directly login as the same normal user, the program takes
about 9 hours to complete.

On Fedora 7 (it turns out my kernel is of a different version, Kernel
2.6.21-1.3194, perhaps it's an earlier distribution), it always needs 9
hours to complete no matter I login as root or normal user first.

In all cases, the swap usage is around 16GB just before the end of the
program execution.

Is there any difference in the memory management for 2.6.21 and 2.6.23, and
why logging as a root user first will reduce the execution time by that much
in 2.6.23? Thanks in advance.

Best Regards,
LaBird (Benny).
[Email: Remove all underscores to get the correct address.]


.

Relevant Pages

  • Re: startx Fatal server error: Cannot open /dev/tty0
    ... > startx fails under your normal user login but starts normally under your ... the question become why root user ... can init the video device, ...
    (alt.os.linux.suse)
  • Re: Swap or I/O Improvement in Fedora 8?
    ... | I first login as root, and then "su" to a normal user to run the program. ... Try login as a normal user, su to root, and then from that root shell, su ...
    (comp.os.linux.development.system)
  • Re: [opensuse] login question.
    ... how can I login as su? ... I'm autologging in as normal user, and when I have to do administrative ... Additionally you can configure Sudo to allow you to become root without ... Note that the command to get a root shell from sudo is: ...
    (SuSE)
  • Re: strange and serious problem about user login
    ... > any service other than root. ... > and I try to login as normal user except root, ... > and when I start sshd in this pc, I get no errors, but when I check ...
    (Fedora)
  • Re: Password scan
    ... Disable password-based authentication and use key-based auth only. ... If you need to login to a normal user first, ... su/sudo to become root, an attacker can easily guess the length of the ...
    (comp.os.linux.security)