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man/ruby.1: document stack size env variables

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[Feature #10197]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47713 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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@ -1,3 +1,8 @@
Fri Sep 26 05:12:10 2014 Eric Wong <e@80x24.org>
* man/ruby.1: document stack size env variables
[Feature #10197]
Thu Sep 25 19:37:34 2014 Eric Wong <e@80x24.org>
* io.c (free_io_buffer): new function for a common pattern

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man/ruby.1
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@ -482,6 +482,34 @@ as below.
% gem help
.Ed
.Pp
.Sh STACK SIZE ENVIRONMENT
Stack size environment variables are implementation-dependent and
subject to change with different versions of Ruby. The VM stack is used
for pure-Ruby code and managed by the virtual machine. Machine stack is
used by the operating system and its usage is dependent on C extensions
as well as C compiler options. Using lower values for these may allow
applications to keep more Fibers or Threads running; but increases the
chance of SystemStackError exceptions and segmentation faults (SIGSEGV).
These environment variables are available since Ruby 2.0.0.
All values are specified in bytes.
.Pp
.Bl -hang -compact -width "RUBY_THREAD_MACHINE_STACK_SIZE"
.It Ev RUBY_THREAD_VM_STACK_SIZE
VM stack size used at thread creation.
default: 131072 (32-bit CPU) or 262144 (64-bit)
.Pp
.It Ev RUBY_THREAD_MACHINE_STACK_SIZE
Machine stack size used at thread creation.
default: 524288 or 1048575
.Pp
.It Ev RUBY_FIBER_VM_STACK_SIZE
VM stack size used at fiber creation.
default: 65536 or 131072
.Pp
.It Ev RUBY_FIBER_MACHINE_STACK_SIZE
Machine stack size used at fiber creation.
default: 262144 or 524288
.Pp
.Sh SEE ALSO
.Bl -hang -compact -width "http://www.ruby-lang.org/123"
.It https://www.ruby-lang.org/