How to increase DefaultTasksMax in RHEL/CentOS 8 onwards ?
Let us see how to increase the DefaultTasksMax in RHEL, or CentOS 8 Operating system onwards.
The default maximum tasks in RHEL/CentOS8 is quite low when you run any database server.
It is usually assigned at 80%, which we can increase a maximum to 100% or Infinity.
Lets see how to do this.
Check current DefaultTasksMax and change it to 100% or infinity.
[root@ngelinux saket]# systemctl show --property DefaultTasksMax DefaultTasksMax=23685
Steps to do it:
1. Change DefaultTasksMax in /etc/systemd/system.conf to infinity.
[root@ngelinux scratch]# cat /etc/sysctl.conf # sysctl settings are defined through files in # /usr/lib/sysctl.d/, /run/sysctl.d/, and /etc/sysctl.d/. # # Vendors settings live in /usr/lib/sysctl.d/. # To override a whole file, create a new file with the same in # /etc/sysctl.d/ and put new settings there. To override # only specific settings, add a file with a lexically later # name in /etc/sysctl.d/ and put new settings there. # # For more information, see sysctl.conf(5) and sysctl.d(5). net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 kernel.threads-max=984400000 [root@ngelinux scratch]# [root@ngelinux scratch]# systemctl show --property DefaultTasksMax DefaultTasksMax=4194303 [root@ngelinux scratch]# cat /etc/systemd/system.conf | grep -i tasks #DefaultTasksAccounting=yes #DefaultTasksMax=18446744073709551615 DefaultTasksMax=100% #DefaultTasksMax=infinity [root@ngelinux scratch]#
2. Reload the systemd:
# systemctl daemon-reload