/irbsession
Created Jun 22, 2012
How big is a Ruby thread? (a crude approximation on MRI/YARV on Linux)
| 1.9.3p194 :001 > base = Integer(`ps -o rss #{Process.pid}`[/\d+/]) | |
| => 5748 | |
| 1.9.3p194 :002 > Thread.new { sleep } | |
| => #<Thread:0x8db9d24 sleep> | |
| 1.9.3p194 :003 > Integer(`ps -o rss #{Process.pid}`[/\d+/]) - base | |
| => 20 |
| From ps(1) on Linux: | |
| The SIZE and RSS fields don't count some parts of a process including the page tables, kernel stack, struct thread_info, and struct task_struct. This | |
| is usually at least 20 KiB of memory that is always resident. SIZE is the virtual size of the process (code+data+stack). |
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