1. GDB MySQL参数 Open-files-limit 苏普 2010-10 1

2. 起源 > Can't open file: '.estytable.frm' (errno: 24) shell> perror 24 OS error code 24: Too many open files 尝试修改open_files_limit Changes the number of file descriptors available to mysqld. You should try increasing the value of this option if mysqld gives you the error Too many open files. mysqld uses the option value to reserve descriptors with setrlimit(). If the requested number of file descriptors cannot be allocated, mysqld writes a warning to the error log.

4. Why? 开启了一个痛苦代码追踪过程

6. (gdb) watch open_files_limit

7. (gdb) rOld value = 0 New value = 20000 Old value = 20000 New value = 1024 init_common_variables (...) at mysqld.cc:3355

9. (gdb) b mysqld.cc:3322

10. (gdb) r

12. mysys/my_file.c static uintset_max_open_files(uintmax_file_limit){ ... if (rlimit.rlim_cur >= max_file_limit) DBUG_RETURN(rlimit.rlim_cur); rlimit.rlim_cur= rlimit.rlim_max= max_file_limit; if (setrlimit(RLIMIT_NOFILE, &rlimit)) }

13. Linux && setrlimit man setrlimit set resource limits

14. Almost Done mysqld_safe if test -w / -o "$USER" = "root" then ...... if test -n "$open_files" then ulimit -n $open_files append_arg_to_args "--open-files-limit=$open_files" fi fi

15. Simple? or not？ That’s all Who’s next

16. Good Luck Q & A