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authorBogdan <bogdanvlviv@gmail.com>2018-12-18 20:25:35 +0200
committerDavid Heinemeier Hansson <david@loudthinking.com>2018-12-18 10:25:35 -0800
commite9f6ce617be2f67b098e6fb689592f70c0009eb2 (patch)
treefb69f2829c8e70713d4ee15371eda27e98d0362d /guides
parent2f6456cbe1da73c13b37e23720caa8716df85e78 (diff)
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Add option to set parallel test worker count to the physical core count of the machine (#34735)
* Add option to set parallel test worker count to the physical core count of the machine Also, use the physical core count of the machine as the default number of workers, and generate the `test_helper.rb` file with `parallelize(workers: :number_of_processors)` Closes #34734 * Ensure that we always test parallel testing Since #34734 we decided to use the physical core count of the machine as the default number of workers in the parallel testing, we need to ensure that some tests use at least 2 workers because we could run those tests on VM that has only 1 physical core. It also fixes tests failures on the CI since Travis server we are using has only one physical core. See https://travis-ci.org/rails/rails/jobs/469281088#L2352
Diffstat (limited to 'guides')
-rw-r--r--guides/source/testing.md8
1 files changed, 4 insertions, 4 deletions
diff --git a/guides/source/testing.md b/guides/source/testing.md
index 9541598b26..f34f9d95f4 100644
--- a/guides/source/testing.md
+++ b/guides/source/testing.md
@@ -473,8 +473,8 @@ takes your entire test suite to run.
### Parallel testing with processes
The default parallelization method is to fork processes using Ruby's DRb system. The processes
-are forked based on the number of workers provided. The default is 2, but can be changed by the
-number passed to the parallelize method.
+are forked based on the number of workers provided. The default number is the actual core count
+on the machine you are on, but can be changed by the number passed to the parallelize method.
To enable parallelization add the following to your `test_helper.rb`:
@@ -516,7 +516,7 @@ class ActiveSupport::TestCase
# cleanup databases
end
- parallelize(workers: 2)
+ parallelize(workers: :number_of_processors)
end
```
@@ -531,7 +531,7 @@ To change the parallelization method to use threads over forks put the following
```ruby
class ActiveSupport::TestCase
- parallelize(workers: 2, with: :threads)
+ parallelize(workers: :number_of_processors, with: :threads)
end
```