Forum: Ruby-core IO operation is 10x slower in multi-thread environment

8afb291b08d3dbce82eb2e1ee66993f7?d=identicon&s=25 unknown (Guest)
on 2014-08-16 17:56
(Received via mailing list)
Issue #10009 has been updated by Alexandre Riveira.

File test_thread_sched.rb added

I rewrote the test, I created the --tasket --postgres arguments and to
use the same test file.

Feel free to change whatever you want.

Soon bring news about the test with futex

----------------------------------------
Bug #10009: IO operation is 10x slower in multi-thread environment
https://bugs.ruby-lang.org/issues/10009#change-48376

* Author: Alexandre Riveira
* Status: Open
* Priority: Urgent
* Assignee:
* Category:
* Target version:
* ruby -v: ruby 2.1 x ruby 1.9.2 with taskset
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN
----------------------------------------
I created this issue #9832 but not have io operation.
In the script attached I simulate IO operation in multi-thread
environment.
For ruby 1.9.2 apply `taskset -c -p 2 #{Process.pid}` for regulates
threads behavior.
The second Thread is a io operation

My results:

1) ruby 2.1.2
first 43500194
second 95
third 42184385

2) ruby-2.0.0-p451
first 38418401
second 95
third 37444470

3) 1.9.3-p545
first 121260313
second 50
third 44275164

4) 1.9.2-p320
first 31189901
second 897 <============
third 31190598

Regards


Alexandre Riveira


---Files--------------------------------
teste_thread_schedule_2.rb (1.05 KB)
teste_thread_schedule.py (953 Bytes)
teste_thread_schedule.rb (955 Bytes)
test_thread_sched_pipe.rb (1.01 KB)
test_thread_sched.rb (2.82 KB)
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