Thread Stack¶
檢查系統上每個 thread stack 可以拿到多少 RAM：
# Linux
$ ulimit -s
8192 # 8192 KB = 8 MB
$ ulimit -a
Maximum size of core files created (kB, -c) 0
Maximum size of a process’s data segment (kB, -d) unlimited
Maximum size of files created by the shell (kB, -f) unlimited
Maximum size that may be locked into memory (kB, -l) 1024
Maximum resident set size (kB, -m) unlimited
Maximum number of open file descriptors (-n) 1024
Maximum stack size (kB, -s) 8192
Maximum amount of cpu time in seconds (seconds, -t) unlimited
Maximum number of processes available to a single user (-u) 23231
Maximum amount of virtual memory available to the shell (kB, -v) unlimited
# FreeBSD
$ ulimit -s
40960
$ ulimit -a
cpu time (seconds, -t) 5400
file size (512-blocks, -f) unlimited
data seg size (kbytes, -d) 25600
stack size (kbytes, -s) 40960
core file size (512-blocks, -c) unlimited
max memory size (kbytes, -m) 65536
locked memory (kbytes, -l) 40960
max user processes (-u) 256
open files (-n) 100
virtual mem size (kbytes, -v) unlimited
swap limit (kbytes, -w) unlimited
sbsize (bytes, -b) unlimited
pseudo-terminals (-p) unlimited
# Windows 上預設 thread stack limit 是 1 MB
設定檔： /etc/security/limits.conf
ex:
* soft stack 2048
* hard stack 2048
man pthread_create
On **Linux/x86-32**, the default stack size for a new thread is **2 megabytes**.
Under the NPTL threading implementation,
if the **RLIMIT_STACK** soft resource limit at the time the program started has any value other than "unlimited",
then it determines the default stack size of new threads.
Using **pthread_attr_setstacksize**(3),
the stack size attribute can be explicitly set in the attr argument used to create a thread,
in order to obtain a stack size other than the default.
- pthread_attr_setstacksize