[Erlang危机](4.4)命名管道

最新推荐文章于 2024-05-04 22:43:58 发布

转载最新推荐文章于 2024-05-04 22:43:58 发布 · 40 阅读

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原文链接：http://www.cnblogs.com/gcczhongduan/p/4749577.html

本文介绍了一种鲜为人知的Erlang节点连接方式——命名管道，此方法无需显式分布配置，通过run_erl命令启动Erlang并指定命名管道文件及日志目录，实现节点间的通信。

原创文章，转载请注明出处：server非业余研究http://blog.youkuaiyun.com/erlib 作者Sunface

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Named Pipes

命名管道(Named Pipes)

A little known way to connect with an Erlang node that requires no explicit distribution is through named pipes. This can be done by starting Erlang with run_erl, which wraps Erlang in a named pipe 5:

另一种鲜为人知连接Erlang节点的方法：命名管道(named pipes)，能够通过使用run_erl 启动Erlang来完毕 (Erlang会被包裹在命名管道内)5。

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$ run_erl /tmp/erl_pipe /tmp/log_dir "erl"
-------------------------------------------------------------------------------------
The first argument is the name of the file that will act as the named pipe. The second one is where logs will be saved 6 .

第一个參数是指定作为命名管道的文件。第二个是存放日志的文件夹6。

To connect to the node, you use the to_erl program:

你能够使用 to_erl程序连接到节点上：

-------------------------------------------------------------------------------------
$ to_erl /tmp/erl_pipe
Attaching to /tmp/erl_pipe (^D to exit)
1>
-------------------------------------------------------------------------------------

And the shell is connected. Closing stdio (with ˆD) will disconnect from the shell while leaving it running.

连接上后，你能够使用ctrl+D来断开远程节点(仅仅是断开，不会终结远程节点).

[5] "erl" is the command being run. Additional arguments can be added after it. For example "erl +K true" will turn kernel polling on.
[6] Using this method ends up calling fsync for each piece of output, which may give quite a performance hit if a lot of IO is taking place over standard output.

[注5]：“erl”就是要执行的命令，你也能够其次是其他启动选项，如"erl +K ture"它会打开内核kernel调查。
[注意6] ：这种方法最终调用fsync每件作品将同步输出，假设你有大量的IO经营产品，性能急剧下降。

转载于:https://www.cnblogs.com/gcczhongduan/p/4749577.html