你好，
我在运行

composer require croon/croon

Please provide a version constraint for the croon/croon requirement:

然后我就不知道该输入多少版本号了，上一步 composer install 是成功的。

曾尝试不做这一步，直接使用，新建了一个 croon.list 的文件 使用

./bin/croon ../croon.list -l croon.log

PHP Fatal error: Class 'Pagon\ChildProcess\ChildProcess' not found in /root/croon/src/Croon/Croon.php on line 36

Fatal error: Class 'Pagon\ChildProcess\ChildProcess' not found in /root/croon/src/Croon/Croon.php on line 36

但是我查找了一下这个文件是存在的，

ls /root/croon/vendor/pagon/childprocess/lib/Pagon/ChildProcess.php

麻烦分析一下是什么问题导致的，我对composer 和 posix 及 pencl 都不是很了解。只是按相关的文档安装上的。

composer install --no-dev

Running composer as root/super user is highly discouraged as packages, plugins and scripts cannot always be trusted
Loading composer repositories with package information
Updating dependencies

[Composer\Downloader\TransportException]
Content-Length mismatch

install [--prefer-source] [--prefer-dist] [--dry-run] [--dev] [--no-dev] [--no-custom-installers] [--no-autoloader] [--no-scripts] [--no-progress] [-v|vv|vvv|--verbose] [-o|--optimize-autoloader] [-a|--classmap-authoritative] [--ignore-platform-reqs] [--] []...

composer diagnose

Running composer as root/super user is highly discouraged as packages, plugins and scripts cannot always be trusted
Checking composer.json: FAIL
require.pagon/eventemitter : unbound version constraints () should be avoided
require.pagon/logger : unbound version constraints () should be avoided
require.pagon/argparser : unbound version constraints (*) should be avoided
Checking platform settings: OK
Checking git settings: OK
Checking http connectivity to packagist: Warning: Accessing packagist.org over http which is an insecure protocol.
OK
Checking https connectivity to packagist: OK
Checking github.com rate limit: OK
Checking disk free space: OK

如何daemon方式运行.另外有什么监控 的手段?

问题出在auto_write，如果不对这个设置值即采用默认的（false），这时候生成的日志会出现好多冗余数据，每一次的写入都会把以前的信息再加起来，好像是把所有的日志累加起来了，后来我尝试把auto_write设置成了 true 发现这个问题就不存在了。

下面是我的一段实际测试命令，通过wc -l 获取log日志的总行数，可以看出区别。

看了看日志功能的代码，功底太浅，被玩的快走火入魔了。。。。还是看不懂。

$ echo ''>cron.log
$ cat cron.list
* * * * * * ls
$ time bin/croon -l cron.log cron.list
^C
real    0m20.111s
user    0m0.359s
sys 0m0.279s
$ wc -l cron.log
     548 cron.log
$ echo ''>cron.log
$ vim bin/croon
$ # 把 auto_write 设置成了 true
$ time bin/croon -l cron.log cron.list
^C
real    0m19.856s
user    0m0.353s
sys 0m0.317s
/Documents/phpcron$ wc -l cron.log
      65 cron.log```