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.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

increase the amount of Fibers and Threads at runtime; but increase the

chance of SystemStackError exceptions and segmentation faults (SIGSEGV).

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)

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.It Ev RUBY_THREAD_MACHINE_STACK_SIZE

Machine stack size used at thread creation.

default: 524288 or 1048575

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.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