最近发现，Composer在具有大量历史标记的包上消耗了大量CPU +内存。看到作曲家/作曲家# 7577

这个问题的解决方法是使用symfony/flex或https://github.com/rubenrua/symfony-clean-tags-composer-plugin

composer global require rubenrua/symfony-clean-tags-composer-plugin

Here is another way to solve this problem under windows, if you use Wampserver. Indeed at the level of wampserver, there are two php.ini files, that of PHP, which one can find in the location C: \ wamp64 \ bin \ php \ phpx.xx \ php.ini and that of Apache , which can be found at location C: \ wamp64 \ bin \ apache \ apachex.xx \ bin \ php.ini. Both of these files have the memory_limit parameter. So to be sure to solve this problem, it is better to set the memory_limit = -1 parameter in both files at once.

Fatal error: Allowed memory size of 1610612736 bytes exhausted (tried to allocate 4096 bytes) in phar:///usr/local/bin/composer/src/Composer/DependencyResolver/RuleWatchGraph.php on line 52 Check https://getcomposer.org/doc/articles/troubleshooting.md#memory-limit-errors for more info on how to handle out of memory errors.

Set memory_limit to -1 works for me;) (vim /etc/php/7.2/cli/php.ini)

对于macOS Catalina和macOS Big Sur中的此错误，请使用以下代码行:

PHP -d memory_limit=-1 /usr/local/bin/composer update——no-plugins

我用这句话来更新Symfony 5。这个命令也适用于laravel 7。

在确保供应商文件夹存在之前，请确保不需要包。

检查之前是否安装过composer。您可能只是将存储库克隆到您的机器上。因此，在需要新的包之前，必须先安装旧的包。或者，您可能希望在composer命令中包含这个选项——profile，以查看时间和内存使用信息。

在我的例子中，我丢失了一个交换分区。更多信息:https://github.com/composer/composer/issues/7348#issuecomment-414178276