前言
关于堆栈，堆是程序员申请的一片内存区域；栈是编译器自动分配释放，存放函数的参数值、局部变量值等。
栈
栈可用用ulimit -a来看，用ulimit -s来改
hugodeMacBook-Pro:code hugo$ ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
file size (blocks, -f) unlimited
max locked memory (kbytes, -l) unlimited
max memory size (kbytes, -m) unlimited
open files (-n) 4864
pipe size (512 bytes, -p) 1
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 1418
virtual memory (kbytes, -v) unlimited
hugodeMacBook-Pro:code hugo$ sudo su
bash-3.2# ulimit -s
8192
bash-3.2# ulimit -s 8193
bash-3.2# ulimit -s
8193
bash-3.2# ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
file size (blocks, -f) unlimited
max locked memory (kbytes, -l) unlimited
max memory size (kbytes, -m) unlimited
open files (-n) 4864
pipe size (512 bytes, -p) 1
stack size (kbytes, -s) 8193
cpu time (seconds, -t) unlimited
max user processes (-u) 1418
virtual memory (kbytes, -v) unlimited