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 _______________________________________________ CentOS mailing list CentOS at centos.org http://lists.centos.org/mailman/listinfo/centos ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please visit http://www.symanteccloud.com ______________________________________________________________________ ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3349 / Virus Database: 3204/6481 - Release Date: 07/10/13 Internal Virus Database is out of date. ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please visit http://www.symanteccloud.com ______________________________________________________________________