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Diffstat (limited to 'man/ruby.1')
| -rw-r--r-- | man/ruby.1 | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/man/ruby.1 b/man/ruby.1 index 1c0a7dabc7..8f0c0d1ae7 100644 --- a/man/ruby.1 +++ b/man/ruby.1 @@ -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/ |