在Bash中将进程限制为0.5秒

Question

如何在Bash中将进程限制为少于1秒的CPU时间？我使用的是版本4.1.5(1),如果我输入ulimit -t 0.5 command,我得到:

-bash: ulimit: 0.5: invalid number

我使用的ulimit -t 1 command是一个不完美的替代品,但由于技术原因我不需要打扰你,我非常希望command在它有一个半秒或者可能少一点的CPU后停止.

特定于Linux的答案会很好.

Answer 1

也许你不能.底层系统调用(setrlimit)仅提供全秒解析.

 RLIMIT_CPU
          CPU time limit in seconds.  When the process  reaches  the  soft
          limit, it is sent a SIGXCPU signal.  The default action for this
          signal is to terminate the process.  However, the signal can  be
          caught,  and the handler can return control to the main program.
          If the process continues to consume CPU time, it  will  be  sent
          SIGXCPU  once  per  second  until  the hard limit is reached, at
          which time it is sent SIGKILL.