LINUX在多核环境下，如果控制使用的CPU数目

进入/boot/grub
修改grub.conf
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /boot/, eg.
#          root (hd0,0)
#          kernel /vmlinuz-version ro root=/dev/sda2
#          initrd /initrd-version.img
#boot=/dev/sda
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title Red Hat AS4 (2.6.9-67.ELsmp)
        root (hd0,0)
        kernel /vmlinuz-2.6.9-67.ELsmp ro root=LABEL=/ rhgb quiet
        initrd /initrd-2.6.9-67.ELsmp.img
title Red Hat AS4-up (2.6.9-67.EL)
        root (hd0,0)
        kernel /vmlinuz-2.6.9-67.EL ro root=LABEL=/ rhgb quiet
        initrd /initrd-2.6.9-67.EL.img
为：
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /boot/, eg.
#          root (hd0,0)
#          kernel /vmlinuz-version ro root=/dev/sda2
#          initrd /initrd-version.img
#boot=/dev/sda
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title Red Hat AS4 (2.6.9-67.ELsmp)
        root (hd0,0)
        kernel /vmlinuz-2.6.9-67.ELsmp ro root=LABEL=/ rhgb quiet maxcpus=1
        initrd /initrd-2.6.9-67.ELsmp.img
title Red Hat AS4-up (2.6.9-67.EL)
        root (hd0,0)
       &nbs