Selenium服务器最大的firefox实例

Question

我有一台32 Gb RAM的服务器，我希望并行运行70个firefox实例。我尝试这样简单的selenium服务器配置：

java -jar /usr/lib/selenium/selenium-server-standalone.jar -port 4444 -maxSession 100 -DPOOL_MAX=1024 -trustAllSSLCertificates

但是当我并行运行70个测试时，PHP selenium webdriver返回错误：

exception 'WebDriverCurlException' with message 'Curl error thrown for http POST to /session with params: {"desiredCapabilities":{"firefox_profile":"....","browserName":"firefox","javascriptEnabled":true}}

Operation timed out after 300000 milliseconds with 0 bytes received' in /app/vendors/SeleniumWebdriver/WebDriverExceptions.php:39
Stack trace:
#0 /app/vendors/SeleniumWebdriver/remote/HttpCommandExecutor.php(213): WebDriverException::throwException(-1, 'Curl error thro...', Array)
#1 /app/vendors/SeleniumWebdriver/remote/RemoteWebDriver.php(74): HttpCommandExecutor->execute(Object(WebDriverCommand))

然后我尝试使用一个集线器和两个节点创建selenium grid 2但它仍然无法正常工作（我得到相同的错误）。可能我必须将DPOOL_MAX设置为超过1024？