我的 Homestead Composer 时经常 proc_open (): fork failed - Cannot allocate memory 求大佬解答

The following exception is caused by a lack of memory or swap, or not having swap configured
Check https://getcomposer.org/doc/articles/troub... for details

PHP Warning: proc_open(): fork failed - Cannot allocate memory in phar:///usr/local/bin/composer/vendor/symfony/console/Application.php on line 959

Warning: proc_open(): fork failed - Cannot allocate memory in phar:///usr/local/bin/composer/vendor/symfony/console/Application.php on line 959

[ErrorException]
proc_open(): fork failed - Cannot allocate memory