[CentOS] Cpus_allowed_list issue in RHEL6.4
Tony Sweeney
tsweeney at omnifone.com
Wed Jul 24 11:03:35 UTC 2013
Read up on CPU sets
http://man7.org/linux/man-pages/man5/proc.5.html
http://man7.org/linux/man-pages/man7/cpuset.7.html
Tony.
-----Original Message-----
From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On Behalf Of Miraj Mohamed
Sent: 24 July 2013 11:57
To: centos at centos.org
Subject: [CentOS] Cpus_allowed_list issue in RHEL6.4
Hi All,
I am using RHEL 6.4 on a Dell Server with 32 cores.
But in the Cpus_allowed_list only 30 cores are available. Why is that?
See the snippet from cat /proc/self/status:
Cpus_allowed: 7fff7fff
Cpus_allowed_list: 0-14,16-30
The allowed list is same for the init process as well (see below).
I didn't see this issue, in RHEL 6.2.
Why is that? Is there a way to change it?
-miraj
-------------------------------------
[root at localhost bin]# uname -a
Linux localhost 2.6.32-358.el6.x86_64 #1 SMP Tue Jan 29 11:47:41 EST 2013 x86_64 x86_64 x86_64 GNU/Linux [root at localhost bin]# [root at localhost bin]# [root at localhost bin]# cat /proc/1/status
Name: init
State: S (sleeping)
Tgid: 1
Pid: 1
PPid: 0
TracerPid: 0
Uid: 0 0 0 0
Gid: 0 0 0 0
Utrace: 0
FDSize: 64
Groups:
VmPeak: 19364 kB
VmSize: 19356 kB
VmLck: 0 kB
VmHWM: 1544 kB
VmRSS: 1544 kB
VmData: 328 kB
VmStk: 88 kB
VmExe: 140 kB
VmLib: 2348 kB
VmPTE: 52 kB
VmSwap: 0 kB
Threads: 1
SigQ: 1/256326
SigPnd: 0000000000000000
ShdPnd: 0000000000000000
SigBlk: 0000000000000000
SigIgn: 0000000000001000
SigCgt: 00000001a0016623
CapInh: 0000000000000000
CapPrm: ffffffffffffffff
CapEff: fffffffffffffeff
CapBnd: ffffffffffffffff
Cpus_allowed: 7fff7fff
Cpus_allowed_list: 0-14,16-30
Mems_allowed: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000003
Mems_allowed_list: 0-1
voluntary_ctxt_switches: 1603
nonvoluntary_ctxt_switches: 62
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