composer 安装，内存溢出

composer install 时候报错：
Allowed memory size of 1610612736 bytes exhausted (tried to allocate 134217736 bytes) in phar:///usr/local/bin/composer/src/Composer/DependencyResolver/RuleSet.php on line 84

执行命令，临时修改不限内存

COMPOSER_MEMORY_LIMIT=-1 composer install