Disable Transparent Huge Pages

[gottfrois]

Run docker run -it redis and you'll get the following warning message:

WARNING you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted after THP is disabled.

I think it should be disabled in boot2docker but since you use a custom image if I understood correctly. Here is the boot2docker issue link: boot2docker/boot2docker#1083

[adrianfalleiro]

Since dinghy runs on top of docker-machine it uses boot2docker on OS X.

I've run into this issue before, but resolved it using the fix suggested in the ticket you linked to, by running docker-machine ssh dinghy and making the necessary changes.

[gottfrois]

Alright, thanks for the tip :)

[codekitchen]

Agreed, this should be tracked in docker-machine.

[gottfrois]

Unfortunately I am not able to run the fix suggested:

docker@dinghy:~$ echo never > /sys/kernel/mm/transparent_hugepage/enabled
-sh: can't create /sys/kernel/mm/transparent_hugepage/enabled: Permission denied
docker@dinghy:~$ sudo echo never > /sys/kernel/mm/transparent_hugepage/enabled
-sh: can't create /sys/kernel/mm/transparent_hugepage/enabled: Permission denied

[codekitchen]

Your sudo is only applying to the echo command not the write to disk. You could use tee, or just run sudo -i to get a root shell.

[gottfrois]

Thanks man :)