From: Sigurd <cu9ypd@...>
Date: 2012-02-01T18:56:29+09:00
Subject: Re: stack level too deep (SystemStackError)

Ruby have static stack size for thread - it's defined in vm_core.h 

/* each thread has this size stack : 128KB */
#define RUBY_VM_THREAD_STACK_SIZE (128 * 1024)

System settings have no effect on a ruby thread stack size.

On Feb 1, 2012, at 11:05 AM, Alex Rothbard wrote:

> Hello. If I execute the following code:
> 
> ruby -e 'def t(i) p i;t(i+1) end;t 0'
> 
> I get this:
> 
> ...
> 8730
> 8731
> -e:1: stack level too deep (SystemStackError)
> 
> Alright, that seems normal. My ulimit settings are as follows:
> 
> socket buffer size       (bytes, -b) unlimited
> core file size          (blocks, -c) unlimited
> data seg size           (kbytes, -d) 33554432
> file size               (blocks, -f) unlimited
> max locked memory       (kbytes, -l) unlimited
> max memory size         (kbytes, -m) unlimited
> open files                      (-n) 11095
> pipe size            (512 bytes, -p) 1
> stack size              (kbytes, -s) 524288
> cpu time               (seconds, -t) unlimited
> max user processes              (-u) 5547
> virtual memory          (kbytes, -v) unlimited
> swap size               (kbytes, -w) unlimited
> 
> So, in theory if I *reduce* the stack size, the above number should go
> down, right? That's not what happens. I tried reducing the stack size
> from 512MB to 24KB, but I am still able to get 8731 iterations. Does
> anyone know why?
> 
> -- 
> Posted via http://www.ruby-forum.com/.
>