On Thu, May 17, 2012 at 1:58 PM, Michael Coffman < michael.coff...@avagotech.com> wrote:
> > > On Thu, May 17, 2012 at 1:26 PM, VINIT ADYA (BLOOMBERG/ 731 LEXIN) < > va...@bloomberg.net> wrote: > >> Can you post /proc/meminfo. >> > > Here is meminfo with overcommit_memory=0 and overcommit_ration=50 (defaults) MemTotal: 2052176 kB MemFree: 1658912 kB Buffers: 23036 kB Cached: 261572 kB SwapCached: 0 kB Active: 94208 kB Inactive: 205604 kB Active(anon): 20732 kB Inactive(anon): 4 kB Active(file): 73476 kB Inactive(file): 205600 kB Unevictable: 6216 kB Mlocked: 6216 kB SwapTotal: 2052088 kB SwapFree: 2052088 kB Dirty: 408 kB Writeback: 0 kB AnonPages: 21456 kB Mapped: 15476 kB Shmem: 224 kB Slab: 43392 kB SReclaimable: 17856 kB SUnreclaim: 25536 kB KernelStack: 1048 kB PageTables: 3292 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 3078176 kB Committed_AS: 137197242528 kB VmallocTotal: 34359738367 kB VmallocUsed: 13156 kB VmallocChunk: 34359715924 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 > 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 > -- -MichaelC
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