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bees: soft-limit computed thread counts to 8

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https://github.com/Zygo/bees/issues/91 describes problems encountered
when running bees on systems with many CPU cores.

Limit the computed number of threads (using --thread-factor or the
default) to a maximum of 8 (i.e. the number of logical cores in a modern
laptop).  Users can override the limit by using --thread-count.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell
2018-11-21 21:28:38 -05:00
parent d9c788d30a
commit 34b04f4255
4 changed files with 21 additions and 1 deletions
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8
docs/options.md
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@@ -5,7 +5,7 @@
* `--thread-count COUNT` or `-c`
Specify maximum number of worker threads. Overrides `--thread-factor`
(`-C`) and default/autodetected values.
(`-C`), default/autodetected values, and the hardcoded thread limit.
* `--thread-factor FACTOR` or `-C`
@@ -16,6 +16,12 @@
below 1.0 to leave some cores idle, or above 1.0 if there are more
disks than CPUs in the filesystem.
If the computed thread count is higher than `BEES_DEFAULT_THREAD_LIMIT`
(currently 8), then only that number of threads will be created.
This limit can be overridden by the `--thread-count` option; however,
be aware that there are [kernel issues with systems that have many CPU
cores](btrfs-kernel.md) when users try to run bees on all of them.
* `--loadavg-target LOADAVG` or `-g`
Specify load average target for dynamic worker threads. Default is