我一直在使用JMeter对我的REST API进行负载测试。
当遇到1000个并发用户时，出现以下错误：

Too many open files. Stacktrace follows:
java.net.SocketException: Too many open files
    at java.net.Socket.createImpl(Socket.java:397)
    at java.net.Socket.getImpl(Socket.java:460)
    at java.net.Socket.setSoTimeout(Socket.java:1017)
    at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:126)
    at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:180)
    at org.apache.http.impl.conn.ManagedClientConnectionImpl.open(ManagedClientConnectionImpl.java:294)
    at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:640)
    at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:479)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:906)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:805)
    at groovyx.net.http.HTTPBuilder.doRequest(HTTPBuilder.java:476)
    at groovyx.net.http.HTTPBuilder.doRequest(HTTPBuilder.java:441)
    at groovyx.net.http.HTTPBuilder.request(HTTPBuilder.java:390)

我的服务器尝试访问另一个REST API来获取数据并进行处理，最后返回一个JSON响应。
如何增加Linux中打开文件的数量？
以下是我正在对另一个服务器进行的调用

Map getResponse(Map data, String url){
    HTTPBuilder httpBuilder = new HTTPBuilder(url);
    httpBuilder.request(Method.POST, JSON) {
        headers.'Authorization' = AppConfig.config.appKey;
        headers.'Content-type' = 'application/json'
        body = data
        response.success = { resp, reader ->
            return reader as Map;
        }
        response.failure = { response, reader ->
            return null
        }
    }
}