This may not be the best way to do this but it works for me. I got fed up with seeing the following message in the logs every time MongoDB was restarted.*
Wed Aug 1 12:06:39 [initandlisten] ** WARNING: You are running on a NUMA machine.
Wed Aug 1 12:06:39 [initandlisten] ** We suggest launching mongod like this to avoid performance problems:
Wed Aug 1 12:06:39 [initandlisten] ** numactl –interleave=all mongod [other options]
I’m using a pretty boilerplate init.d script for mongo so I figured it would be simple to update the start command to use numactl. What I discovered is that my init script uses a builtin bash function called daemon to start the mongo process. daemon allows for a –user option. Unfortunately, numactl does not. Neither is it possible to execute a bash function using numactl. “TO THE GOOGLES!”
Hmm, everything I see recommends wrapping the numactl command around another command called start-stop-daemon. OK, but CentOS doesn’t have a start-stop-daemon command. Argh.
Finally I resorted to digging into the daemon function to see what it was doing and came up with this:
It works. Moving on now.