From: Suraj Kurapati <redmine@...>
Date: 2010-10-08T15:28:26+09:00
Subject: [ruby-core:32717] [Ruby 1.9-Bug#3919][Open] Ruby in PowerTOP - too many CPU wakeups

Bug #3919: Ruby in PowerTOP - too many CPU wakeups
http://redmine.ruby-lang.org/issues/show/3919

Author: Suraj Kurapati
Status: Open, Priority: Normal
Category: core
ruby -v: ruby 1.9.2p0 (2010-08-18 revision 29036) [x86_64-linux]

Hello,

Ruby causes too many CPU wakeups according to Intel's PowerTOP tool.
For example, this simple I/O bound program causes 99 wakeups/second
and accounts for 14% of the CPU wakeups on my system:

  ruby -e gets

In contrast, when I run `python` (2.6.5) and make it wait for I/O, it
does not even appear in PowerTOP because it causes so little wakeups.

Please make Ruby more power-efficient!  Thanks for your consideration.


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