阿里云centos7环境中， 内存1G, 当我执行composer require hwi/oauth-bundle时。 get一个错误，

mmap() failed: [12] Cannot allocate memory
Segmentation fault

下面是我composer.json文件

{
"name": "symfony/framework-standard-edition",
"license": "MIT",
"type": "project",
"description": "The \"Symfony Standard Edition\" distribution",
"autoload": {
    "psr-4": { "": "src/" },
    "classmap": [ "app/AppKernel.php", "app/AppCache.php" ]
},
"autoload-dev": {
    "psr-4": { "Tests\\": "tests/" }
},
"require": {
    "php": ">=5.5.9",
    "symfony/symfony": "3.0.*",
    "doctrine/orm": "^2.5",
    "doctrine/doctrine-bundle": "^1.6",
    "doctrine/doctrine-cache-bundle": "^1.2",
    "symfony/swiftmailer-bundle": "^2.3",
    "symfony/monolog-bundle": "^2.8",
    "sensio/distribution-bundle": "^5.0",
    "sensio/framework-extra-bundle": "^3.0.2",
    "incenteev/composer-parameter-handler": "^2.0",
    "knplabs/knp-paginator-bundle": "^2.5",
    "vich/uploader-bundle": "^1.0",
    "gregwar/captcha-bundle": "^2.0"
},
"require-dev": {
    "sensio/generator-bundle": "^3.0",
    "symfony/phpunit-bridge": "^3.0"
},
"scripts": {
    "post-install-cmd": [
        "Incenteev\\ParameterHandler\\ScriptHandler::buildParameters",
        "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap",
        "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache",
        "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets",
        "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile",
        "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::prepareDeploymentTarget"
    ],
    "post-update-cmd": [
        "Incenteev\\ParameterHandler\\ScriptHandler::buildParameters",
        "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap",
        "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache",
        "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets",
        "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile",
        "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::prepareDeploymentTarget"
    ]
},
"config": {
    "platform": {
        "php": "5.5.9"
    }
},
"extra": {
    "symfony-app-dir": "app",
    "symfony-bin-dir": "bin",
    "symfony-var-dir": "var",
    "symfony-web-dir": "web",
    "symfony-tests-dir": "tests",
    "symfony-assets-install": "relative",
    "incenteev-parameters": {
        "file": "app/config/parameters.yml"
    },
    "branch-alias": {
        "dev-master": "3.0-dev"
    }
}

是由于内存不足导致的吗， 可有时候用conposer install能安装成功， 有时候就报这个错了， why

---

可以尝试增加 swap 空间大小解决该问题

/bin/dd if=/dev/zero of=/var/swap.1 bs=1M count=1024
/sbin/mkswap /var/swap.1
/sbin/swapon /var/swap.1

上述增加 1G 的 swap 空间，可以试试哦

---

可以尝试以下：

1. 查看服务器中是否提交了composer.lock文件，若没有，提交composer.lock文件后执行composer install（假设题主使用了版本控制，本地开发，服务器同步）

2. 查看当前PHP版本，如果不是最新版（PHP7），则升级至最新版

3. 如果以上解决不了，则考虑是否Linux系统安装时没有创建Swapfile，尝试创建后重试

4. 另外，可以考虑增加php.ini配置文件中对内存大小的限制memory_limit