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options: remove default 8 CPU thread limit

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Higher CPU core counts became more common, and kernel bugs became less
common, since the arbitrary 8-thread limit was introduced.  We can remove
the limit now, and treat any remaining scaling inefficiency as a bug to
be removed.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell 2020-12-21 23:09:55 -05:00
parent 032c740678
commit fbd1091052
3 changed files with 0 additions and 14 deletions
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6
docs/options.md
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@ -16,12 +16,6 @@
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

5
src/bees.cc
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@ -842,11 +842,6 @@ bees_main(int argc, char *argv[])
thread_factor = BEES_DEFAULT_THREAD_FACTOR;
}
thread_count = max(1U, static_cast<unsigned>(ceil(thread::hardware_concurrency() * thread_factor)));
if (thread_count > BEES_DEFAULT_THREAD_LIMIT) {
BEESLOGNOTICE("Limiting computed thread count to " << BEES_DEFAULT_THREAD_LIMIT);
BEESLOGNOTICE("Use --thread-count to override this limit");
thread_count = BEES_DEFAULT_THREAD_LIMIT;
}
}
if (load_target != 0) {

3
src/bees.h
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@ -86,9 +86,6 @@ const size_t BEES_OPEN_FILE_LIMIT = (BEES_FILE_FD_CACHE_SIZE + BEES_ROOT_FD_CACH
// Worker thread factor (multiplied by detected number of CPU cores)
const double BEES_DEFAULT_THREAD_FACTOR = 1.0;
// Don't use more than this number of threads unless explicitly configured
const size_t BEES_DEFAULT_THREAD_LIMIT = 8;
// Log warnings when an operation takes too long
const double BEES_TOO_LONG = 5.0;