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Document automatic CPU/IO-concurrency

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Michael Eischer 2022-07-03 12:11:28 +02:00
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18
changelog/unreleased/issue-2162 Normal file
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Enhancement: Adapt IO concurrency based on backend connections
Many commands used hard-coded limits for the number of concurrent operations.
This prevented speed improvements by increasing the number of connections used
by a backend.
These limits have been replaced by using the configured number of backend
connections instead. It can be controlled using the
`-o <backend-name>.connections=5` option. Commands will then automatically
scale their parallelism accordingly.
To limit the number of CPU cores used by restic, you can set the environment
variable `GOMAXPROCS` accordingly. For example to use a single CPU core, use
`GOMAXPROCS=1`.
https://github.com/restic/restic/issues/2162
https://github.com/restic/restic/issues/1467
https://github.com/restic/restic/pull/3611

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doc/047_tuning_backup_parameters.rst
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consumption of restic and that a too high connection count *will degrade performace*.
CPU Usage
=========
By default, restic uses all available CPU cores. You can set the environment variable
`GOMAXPROCS` to limit the number of used CPU cores. For example to use a single CPU core,
use `GOMAXPROCS=1`. Limiting the number of usable CPU cores, can slightly reduce the memory
usage of restic.
Compression
===========