On Thu, May 17, 2012 at 1:26 PM, VINIT ADYA (BLOOMBERG/ 731 LEXIN) < va...@bloomberg.net> wrote:
> Can you post /proc/meminfo. > This is after the system has been rebooted with overcommit turned off. Not sure if that matters: [root@joker ~]# cat /proc/meminfo MemTotal: 2052176 kB MemFree: 1657152 kB Buffers: 20160 kB Cached: 254396 kB SwapCached: 0 kB Active: 126156 kB Inactive: 174860 kB Active(anon): 31988 kB Inactive(anon): 8 kB Active(file): 94168 kB Inactive(file): 174852 kB Unevictable: 6216 kB Mlocked: 6216 kB SwapTotal: 2052088 kB SwapFree: 2052088 kB Dirty: 188 kB Writeback: 0 kB AnonPages: 32588 kB Mapped: 16740 kB Shmem: 228 kB Slab: 43436 kB SReclaimable: 17768 kB SUnreclaim: 25668 kB KernelStack: 1080 kB PageTables: 3680 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 4063220 kB Committed_AS: 125088 kB VmallocTotal: 34359738367 kB VmallocUsed: 13156 kB VmallocChunk: 34359715916 kB HardwareCorrupted: 0 kB AnonHugePages: 0 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB DirectMap4k: 6148 kB DirectMap2M: 2088960 kB > ----- Original Message ----- > From: michael.coff...@avagotech.com > To: cen...@centos.org, rhelv6-list@redhat.com > At: 5/17 15:12:12 > > Hello, > > In general I am in the habit of turning off memory overcommit because I > believe it's a bad thing in a multi-user environment. This was never a > problem on rhel5 systems, but on rhel6, I am having issues. When I try > to set overcommit_memory=2, my system locks up. It basically behaves as > if the memory is all used up... I see the same behavior on centos6 or > rhel6. Following is some output from each platform. > > # -- RHEL6 > # uname -a > Linux joker 2.6.32-220.el6.x86_64 #1 SMP Wed Nov 9 08:03:13 EST 2011 x86_64 > x86_64 x86_64 GNU/Linux > > #lsb_release -a > LSB Version: > > :core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarch > Distributor ID: RedHatEnterpriseWorkstation > Description: Red Hat Enterprise Linux Workstation release 6.2 (Santiago) > Release: 6.2 > Codename: Santiago > > # free > total used free shared buffers cached > Mem: 2052176 234828 1817348 0 15352 112852 > -/+ buffers/cache: 106624 1945552 > Swap: 2052088 0 2052088 > > # sysctl -a |grep commit > vm.overcommit_memory = 0 > vm.overcommit_ratio = 50 > vm.nr_overcommit_hugepages = 0 > # sysctl -w vm.overcommit_memory=2 > vm.overcommit_memory = 2 > # ls > -bash: fork: Cannot allocate memory > # > > #--- CENTOS6 -------------------------- > # uname > -a > Linux joker 2.6.32-220.el6.x86_64 #1 SMP Tue Dec 6 19:48:22 GMT 2011 x86_64 > x86_64 x86_64 GNU/Linux > > # lsb_release -a > LSB Version: > > :core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarch > Distributor ID: CentOS > Description: CentOS release 6.2 (Final) > Release: 6.2 > Codename: Final > > # free > total used free shared buffers cached > Mem: 2052176 378668 1673508 0 19472 252576 > -/+ buffers/cache: 106620 1945556 > Swap: 2052088 0 2052088 > > # sysctl -a |grep commit > vm.overcommit_memory = 0 > vm.overcommit_ratio = 50 > vm.nr_overcommit_hugepages = 0 > # sysctl -w vm.overcommit_memory=2 > vm.overcommit_memory = 2 > [root@joker ~]# ls > -bash: fork: Cannot allocate memory > > One last point. If I set the overcommit values in /etc/sysctl.conf and > then reboot, the values get set correctly on boot and everything seems > fine. In addition I can then change the value of overcommit_memory to 0 > and back to 2 with out any ill affects. > > Searches for issues with setting overcommit_memory=2 haven't turned up > anything useful.. > > > Thanks. > -- > -MichaelC > -- -MichaelC
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