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| author | Koichi Sasada <[email protected]> | 2023-04-10 10:53:13 +0900 |
|---|---|---|
| committer | Koichi Sasada <[email protected]> | 2023-10-12 14:47:01 +0900 |
| commit | be1bbd5b7d40ad863ab35097765d3754726bbd54 (patch) | |
| tree | 2995a0859bea1d6b2903dcd324f41869dbef14a1 /test/ruby/test_thread.rb | |
| parent | 096ee0648e215915a3019c2cd68ba220d94eca12 (diff) | |
M:N thread scheduler for Ractors
This patch introduce M:N thread scheduler for Ractor system.
In general, M:N thread scheduler employs N native threads (OS threads)
to manage M user-level threads (Ruby threads in this case).
On the Ruby interpreter, 1 native thread is provided for 1 Ractor
and all Ruby threads are managed by the native thread.
From Ruby 1.9, the interpreter uses 1:1 thread scheduler which means
1 Ruby thread has 1 native thread. M:N scheduler change this strategy.
Because of compatibility issue (and stableness issue of the implementation)
main Ractor doesn't use M:N scheduler on default. On the other words,
threads on the main Ractor will be managed with 1:1 thread scheduler.
There are additional settings by environment variables:
`RUBY_MN_THREADS=1` enables M:N thread scheduler on the main ractor.
Note that non-main ractors use the M:N scheduler without this
configuration. With this configuration, single ractor applications
run threads on M:1 thread scheduler (green threads, user-level threads).
`RUBY_MAX_CPU=n` specifies maximum number of native threads for
M:N scheduler (default: 8).
This patch will be reverted soon if non-easy issues are found.
[Bug #19842]
Diffstat (limited to 'test/ruby/test_thread.rb')
| -rw-r--r-- | test/ruby/test_thread.rb | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/test/ruby/test_thread.rb b/test/ruby/test_thread.rb index bcd6590903..da14c429e6 100644 --- a/test/ruby/test_thread.rb +++ b/test/ruby/test_thread.rb @@ -1435,7 +1435,8 @@ q.pop Thread.pass until th1.stop? # After a thread starts (and execute `sleep`), it returns native_thread_id - assert_instance_of Integer, th1.native_thread_id + native_tid = th1.native_thread_id + assert_instance_of Integer, native_tid if native_tid # it can be nil th1.wakeup Thread.pass while th1.alive? |