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Disable busy waits in the default OTP vm.args
configuration.
This vastly reduces idle CPU usage, which should generally be beneficial for most small-to-medium sized instances. Additionally update the documentation to specify how to override the vm.args file for OTP installs
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@ -25,11 +25,14 @@ Tuning the BEAM requires you provide a config file normally called [vm.args](htt
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`ExecStart=/usr/bin/elixir --erl '-args_file /opt/akkoma/config/vm.args' -S /usr/bin/mix phx.server`
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If using an OTP release, set the `RELEASE_VM_ARGS` environment variable to the path to the vm.args file.
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Check your OS documentation to adopt a similar strategy on other platforms.
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### Virtual Machine and/or few CPU cores
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Disable the busy-waiting. This should generally only be done if you're on a platform that does burst scheduling, like AWS.
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Disable the busy-waiting. This should generally be done if you're on a platform that does burst scheduling, like AWS, or if you're running other
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services on the same machine.
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**vm.args:**
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@ -39,6 +42,8 @@ Disable the busy-waiting. This should generally only be done if you're on a plat
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+sbwtdio none
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```
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These settings are enabled by default for OTP releases
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### Dedicated Hardware
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Enable more busy waiting, increase the internal maximum limit of BEAM processes and ports. You can use this if you run on dedicated hardware, but it is not necessary.
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@ -9,3 +9,9 @@
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## Tweak GC to run more often
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##-env ERL_FULLSWEEP_AFTER 10
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## Disable busy waits; vastly reduces CPU usage while idle
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## See https://docs.akkoma.dev/stable/configuration/optimisation/optimizing_beam/#virtual-machine-andor-few-cpu-cores
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+sbwt none
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+sbwtdcpu none
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+sbwtdio none
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