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add Puma internal threads explaining #1425

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merged 2 commits into from Oct 1, 2017
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add Puma internal threads explaining #1425

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add Puma internal threads explaining
vizcay Sep 30, 2017
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fixed typo
vizcay Oct 1, 2017
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Expand Up @@ -74,6 +74,8 @@ $ puma -t 8:32

Puma will automatically scale the number of threads, from the minimum until it caps out at the maximum, based on how much traffic is present. The current default is `0:16`. Feel free to experiment, but be careful not to set the number of maximum threads to a large number, as you may exhaust resources on the system (or hit resource limits).

Be aware that additionally Puma creates threads on its own for internal purposes (e.g. handling slow clients). So even if you specify -t 1:1, expect around 7 threads created in your application.

### Clustered mode

Puma also offers "clustered mode". Clustered mode `fork`s workers from a master process. Each child process still has its own thread pool. You can tune the number of workers with the `-w` (or `--workers`) flag:
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