Rust env FQA

collect FQA while setup and maintain rust develop environment, on Mac mostly

问题："Too many open files"

问题现象

thread '<unnamed>' panicked at 'failed to open /dev/urandom: Os { code: 24, kind: Other, message: "Too many open files" }', src/libcore/result.rs:999:5
note: Run with `RUST_BACKTRACE=1` environment variable to display a backtrace.
thread 'main' panicked at 'failed to start new Runtime: Os { code: 24, kind: Other, message: "Too many open files" }', src/libcore/result.rs:999:5

问题原因

$ launchctl limit maxfiles
	maxfiles    256            unlimited
$ ulimit -n
256

解决方法

sudo launchctl limit maxfiles 10000000 10000000
ulimit -n 4096000

操作示例：

$ sudo launchctl limit maxfiles 10000000 10000000
Password:
$ launchctl limit maxfiles
	maxfiles    10000000       10000000    
$ ulimit -n 4096000
$ ulimit -n
4096000