Hi Jason, On 14/08/15 16:45, Jason Warr wrote: > On Fri, 2015-08-14 at 16:31 +0100, Michael H wrote: >> Hi Thomas, >> >> >>> Could anybody point me in the right direction for setting the kernel >>> parameter, max_stack_depth, to 10240 for database tuning? >>> >>> I have currently set it by running 'ulimit -s 10240' but this does not >>> survive a reboot. >>> >>> >> >> Thanks for the response, I've been nosing around that file recently but >> noted the first two lines; >> >> #This file sets the resource limits for the users logged in via PAM. >> #It does not affect resource limits of the system services. >> > > What CentOS version? CentOS7.1 > >>> Look at the file /etc/security/limits.conf >>> >>> For documentation, 'man limits.conf' >>> >>> - Thomas >>> _______________________________________________ >>> CentOS mailing list >>> CentOS at centos.org >>> http://lists.centos.org/mailman/listinfo/centos >>> >> >> I added these two lines to the end of the file >> >> * soft stack 12288 >> * hard stack 12288 >> >> in an attempt to set the stack depth to 12MB so that I can configure >> postgresql max_stack_depth = 10MB. >> >> I rebooted, ulimit -s shows 12288. >> >> When I restart my service (#It does not affect resource limits of the >> system services.) becomes apparent. >> >> Aug 14 16:22:17 db1 pg_ctl[3177]: < 2015-08-14 16:22:17.839 BST >LOG: >> invalid value for parameter "max_stack_depth": 10240 >> Aug 14 16:22:17 db1 pg_ctl[3177]: < 2015-08-14 16:22:17.839 BST >DETAIL: >> "max_stack_depth" must not exceed 7680kB. >> Aug 14 16:22:17 db1 pg_ctl[3177]: < 2015-08-14 16:22:17.839 BST >HINT: >> Increase the platform's stack depth limit via "ulimit -s" or local >> equivalent. >> >> So, I then run 'ulimit -s 12288' and still can't restart my service. >> >> How can I increase stack depth for system processes, not just PAM >> authenticated users? >> > > If this is CentOS 7 then you may need to put the ulimit directives in the service file. > > An example is I needed to increase the NOFILE limit for nfs-secure on a Fedora 20 machine so I set > > LimitNOFILE=16384 > > In /etc/systemd/system/nfs-secure.service I located the service file for postgresql-9.4 [root at db1 multi-user.target.wants]# locate postgresql-9.4.service /etc/systemd/system/multi-user.target.wants/postgresql-9.4.service /usr/lib/systemd/system/postgresql-9.4.service I've edited /etc/systemd/system/multi-user.target.wants/postgresql-9.4.service and added LimitSTACK=12288 to the [Unit] section of the service file. systemctl daemon-reload systemctl restart postgresql-9.4 I'm still getting the same errors when I try to start my service... Aug 17 08:23:58 db1 pg_ctl[16839]: < 2015-08-17 08:23:58.533 BST >LOG: invalid value for parameter "max_stack_depth": 10240 Aug 17 08:23:58 db1 pg_ctl[16839]: < 2015-08-17 08:23:58.533 BST >DETAIL: "max_stack_depth" must not exceed 7680kB. I have tried moving the 'LimitSTACK=12288' to other sections of the service file, when I do I don't get my error from postgresql I see this in /var/log/messages Aug 17 08:38:47 db1 systemd: Reloading. Aug 17 08:38:47 db1 systemd: [/usr/lib/systemd/system/dm-event.socket:10] Unknown lvalue 'RemoveOnStop' in section 'Socket' Aug 17 08:38:47 db1 systemd: [/usr/lib/systemd/system/lvm2-lvmetad.socket:9] Unknown lvalue 'RemoveOnStop' in section 'Socket' Aug 17 08:38:49 db1 systemd: Starting PostgreSQL 9.4 database server... Aug 17 08:38:49 db1 kernel: postgresql94-ch[3021]: segfault at 7ffcd1a28f30 ip 00007f116054c79e sp 00007ffcd1a28f30 error 6 in libc-2.17.so[7f1160458000+1b6000] Aug 17 08:38:49 db1 systemd: postgresql-9.4.service: control process exited, code=killed status=11 Aug 17 08:38:49 db1 systemd: Failed to start PostgreSQL 9.4 database server. Aug 17 08:38:49 db1 systemd: Unit postgresql-9.4.service entered failed state. > > > >> Thanks in advance, >> >> Michael >> _______________________________________________ >> CentOS mailing list >> CentOS at centos.org >> http://lists.centos.org/mailman/listinfo/centos > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > Should I, or can I make this change elsewhere? thanks Michael