Issue #14757 has been reported by normalperson (Eric Wong).

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Feature #14757: [PATCH] thread_pthread.c: enable thread caceh by default
https://bugs.ruby-lang.org/issues/14757

* Author: normalperson (Eric Wong)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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~~~
Since r62466 ("thread_pthread.c: shorten and fix thread cache implementation"),
our thread cache is no longer buggy with programs using fork.
This makes significant improvements in vm_thread_alive_check1
and vm_thread_create_join benchmarks and does not introduce
regressions.

Unlike old thread cache, I've changed the cache to only last 3
seconds since per-thread setup in most programs rarely takes
more than a few milliseconds to re-establish things like network
connections.  This is configurable by changing the THREAD_CACHE_TIME
variable.

I hope this allows users to simplify their code by removing the
need for thread pools in many cases.

vm_thread_alive_check1 10.872   0.150
vm_thread_close         1.988   2.027
vm_thread_condvar1      0.751   0.767
vm_thread_condvar2      0.744   0.752
vm_thread_create_join   5.296   2.343
vm_thread_mutex1        1.911   1.892
vm_thread_mutex2        1.902   1.896
vm_thread_mutex3        2.389   2.313
vm_thread_pass          0.271   0.272
vm_thread_pass_flood    0.175   0.179
vm_thread_pipe          0.460   0.436
vm_thread_queue         0.453   0.446
vm_thread_sized_queue   0.547   0.547
vm_thread_sized_queue2  1.417   1.413
vm_thread_sized_queue3  1.410   1.426
vm_thread_sized_queue4  0.787   0.791

Speedup ratio: compare with the result of `trunk' (greater is better)
name    built
vm_thread_alive_check1 72.456
vm_thread_close         0.981
vm_thread_condvar1      0.979
vm_thread_condvar2      0.990
vm_thread_create_join   2.260
vm_thread_mutex1        1.010
vm_thread_mutex2        1.003
vm_thread_mutex3        1.033
vm_thread_pass          0.994
vm_thread_pass_flood    0.980
vm_thread_pipe          1.055
vm_thread_queue         1.016
vm_thread_sized_queue   0.999
vm_thread_sized_queue2  1.003
vm_thread_sized_queue3  0.989
vm_thread_sized_queue4  0.995
~~~

This seems pretty trivial and low-risk, will commit in a few days
if no objections.


---Files--------------------------------
0001-thread_pthread.c-enable-thread-cache-by-default.patch (2.82 KB)


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