[英]PHP - client socket connections
I am trying to create a set of websocket clients with the following code: 我正在尝试使用以下代码创建一组websocket客户端:
$server = stream_socket_server("tcp://127.0.0.1:8080");
for ($i = 1; $i <= 50; $i++) {
var_dump($i);
stream_socket_client("tcp://127.0.0.1:8080");
}
The first 35, or so, connections are created very fast. 创建前35个左右的连接的速度非常快。 Then everything slows down and every step takes 1 second to execute. 然后一切都变慢了,每个步骤需要1秒钟才能执行。
Could you explain to me why this behaviour happens? 您能否向我解释为什么会发生这种行为? Is it caused by a configuration parameter? 是由配置参数引起的吗? Is it a common websocket behaviour? 这是常见的网络套接字行为吗?
Working hypothesis: pending connections slows down the port 工作假设:挂起的连接会减慢端口的速度
<?php
$server = stream_socket_server("tcp://127.0.0.1:8080");
for ($i = 1; $i <= 50; $i++) {
var_dump($i);
stream_socket_client("tcp://127.0.0.1:8080");
stream_socket_accept($server);
}
Supplement: 补充:
In case listening party is server.c (modified not to accepting connections). 如果侦听方是server.c(修改为不接受连接)。 Connections slow down after 27% of specified backlog. 在指定积压的27%之后,连接速度降低。 http://www.linuxhowtos.org/data/6/server.c http://www.linuxhowtos.org/data/6/server.c
<?php
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
socket_bind($socket, "127.0.0.1", 8081);
$backlog = 500; // less than /proc/sys/net/core/somaxconn
socket_listen($socket, $backlog);
for ($i = 1; $i <= 500; $i++) {
var_dump($i);
stream_socket_client("tcp://127.0.0.1:8081");
}
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