Warning: exec() [function.exec]: Unable to fork，設定git的webhook的問題

我的伺服器是阿里雲的Win server 2008
git託管倉庫是coding，我配置的hook.php內容是
exec("git pull", $array2);var_export($array2);
但是頁面返回
Warning : exec() [function.exec]: Unable to fork [git pull]
這是為什麼呢？
求助？

回覆內容：

我的伺服器是阿里雲的Win server 2008
git託管倉庫是coding，我配置的hook.php內容是
exec("git pull", $array2);var_export($array2);
但是頁面返回
Warning : exec() [function.exec]: Unable to fork [git pull]
這是為什麼呢？
求助？

可能是資源耗盡

Forking means in this case the operation to create a new process using the fork() system call. fork() usually failes because necessary system resources are exhausted, it is likely maxn is likely thatmory are exhausted, it is likely maxoremory emory n​​ision is likely maxmory is likely maxmory nikely nameim is likely max reached.

源自http://stackoverflow.com/questions/20732394/what-does-the-unable-to-fork-error-mean