mysql錯誤：無法創建一個新的線程（errno 11）

Question

我有一個數據庫服務器運行Percona Xtradb服務器和5個奴隸。我總是得到錯誤

mysql error: Can't create a new thread (errno 11); if you are not out of available memory, you can consult the manual for a possible OS-dependent bug

雖然我設置ulimited

root@master:~# ulimit -a 
core file size (blocks, -c) 0 
data seg size (kbytes, -d) unlimited 
scheduling priority (-e) 0 
file size (blocks, -f) unlimited 
pending signals (-i) 2062915 
max locked memory (kbytes, -l) 64 
max memory size (kbytes, -m) unlimited 
open files (-n) 1000000 
pipe size (512 bytes, -p) 8 
POSIX message queues (bytes, -q) 819200 
real-time priority (-r) 0 
stack size (kbytes, -s) 8192 
cpu time (seconds, -t) unlimited 
max user processes (-u) 1000000 
virtual memory (kbytes, -v) unlimited 
file locks (-x) unlimited 





root@master:~# cat /proc/`pidof mysqld`/limits | egrep "(processes|files)"Max processes 1000000 1000000 processes 
Max open files 1000000 1000000 files 

我真的不知道這是怎麼回事？請幫幫我。

Answer 1

這似乎是你的系統達到每個進程的線程的最大數目，請驗證有關線程系統的狀態：

$ cat /proc/sys/kernel/threads-max 

$ echo 'SHOW STATUS;' | mysql | grep -i threads 

您還應該查看有關thread_cache_size的當前設置，此鏈接可能會有所幫助： https://serverfault.com/questions/408845/what-value-of-thread-cache-size-should-i-use

PS：這個話題應該serverfault.com發佈

Answer 2

添加這樣一行到/etc/security/limits.conf文件

mysql soft nproc 4096 

然後重啓MySQL