PHP - Manual: Unix Domain Socket支持

2024-11-13

Connection Pooling (version 1.2.0-1.2.12 *only*) »

Unix Domain Socket支持

MongoDB 服务程序内置支持通过 Unix Sockets 链接，并且会在启动时建立socket，默认位置在 /tmp/mongodb-<port>.sock..

要通过socket链接，需要在连接字符串中指定socket路径，如：


<?php
$m = new MongoClient("mongodb:///tmp/mongo-27017.sock");
?>

如果要在通过socket的链接中对数据库进行认证（如上文所述），你需要指定一个端口号 0 让链接字符串解析时可以找到 socket路径的结尾。另外，你可以在链接的时候使用options参数。


<?php
$m = new MongoClient("mongodb://username:password@/tmp/mongo-27017.sock:0/foo");
?>

更新日志

版本	说明
1.0.9	添加 Unix Sockets 的支持。

add a note

User Contributed Notes 3 notes

down

East Ghost Com ¶

6 years ago


Confirming fast performance running Apache and MongoDB (even a replicaSet secondary, with distant primary over WAN) on same box, communicating via unix domain socket.

$Mongo = new \MongoClient(
    'mongodb:///tmp/mongodb-27017.sock'
        , array(
            'replicaSet' => 'rs1'
            , 'timeout' => 300000
        )
);
$Mdb = $Mongo->DB; // create or open DB
$Mdb->setReadPreference( \MongoClient::RP_NEAREST );

"Postgres core developer Bruce Momjian has blogged about this topic. Momjian states, "Unix-domain socket communication is measurably faster." He measured query network performance showing that the local domain socket was 33% faster than using the TCP/IP stack."

http://stackoverflow.com/questions/257433/postgresql-unix-domain-sockets-vs-tcp-sockets

Excerpt: IP sockets over localhost are basically looped back network on-the-wireIP. There is intentionally “no special knowledge” of the fact that the connection is to the same system, so no effort is made to bypass the normal IP stack mechanisms for performance reasons. For example, transmission over TCP will always involve two context switches to get to the remote socket, as you have to switch through the netisr, which occurs following the “loopback” of the packet through the synthetic loopback interface. Likewise, you get all the overhead of ACKs, TCP flow control, encapsulation/decapsulation, etc. Routing will be performed in order to decide if the packets go to the localhost. Large sends will have to be broken down into MTU-size datagrams, which also adds overhead for large writes. It’s really TCP, it just goes over a loopback interface by virtue of a special address, or discovering that the address requested is served locally rather than over an ethernet (etc).

UNIX domain sockets have explicit knowledge that they’re executing on the same system. They avoid the extra context switch through the netisr, and a sending thread will write the stream or datagrams directly into the receiving socket buffer. No checksums are calculated, no headers are inserted, no routing is performed, etc. Because they have access to the remote socket buffer, they can also directly provide feedback to the sender when it is filling, or more importantly, emptying, rather than having the added overhead of explicit acknowledgement and window changes. The one piece of functionality that UNIX domain sockets don’t provide that TCP does is out-of-band data. In practice, this is an issue for almost noone.

http://osnet.cs.binghamton.edu/publications/TR-20070820.pdf

Excerpt: It was hypothesized that pipes would have the highest throughtput due to its limited functionality, since it is half-duplex, but this was not true. For almost all of the data sizes transferred, Unix domain sockets performed better than both TCP sockets and pipes, as can be seen in Figure 1 below. Figure 1 shows the transfer rates for the IPC mechanisms, but it should be noted that they do not represent the speeds obtained by all of the test machines. The transfer rates are consistent across the machines with similar hardware conﬁgurations though. On some machines, Unix domain sockets reached transfer rates as high as 1500 MB/s.

http://bhavin.directi.com/unix-domain-sockets-vs-tcp-sockets/

down

mike at eastghost dot com ¶

5 years ago


We've enjoyed a 100x - 200x speed boost, just changing from TCP connection to unix domain socket.  Page loads went from 1,400 ms down to 7 ms instantly.

down

ere dot maijala at helsinki dot fi ¶

5 years ago


In my case (CentOS 6.4, PHP 5.3.3, MongoDB 2.4.5, PHP Mongo driver 1.4.2, all on the same system under VMWare, mixed updates, inserts and finds) unix domain sockets seem to work more than ten times faster than a TCP/IP connection to localhost.

add a note

官方地址：https://www.php.net/manual/en/mongo.connecting.uds.php

有任何技术问题请点击这里网站运营推广招聘

IT PHP 编程语言 Linux 开发编程科技 Elasticsearch HTML/CSS/XML 网络 JAVA NoSQL 数据库面试 C/C++ Golang Git 算法操作系统正则表达式 Redis 互联网 MySql JavaScript 运维软件国际架构设计 Mac OS TCP/IP Excel Vim Windows Socket Oracle VR MongoDB Python 运营 MemCache 商业硬件电子娱乐设计 nginx 摄影游戏 WordPress HTTP 团建数码电器

php7 安装fileinfo扩展 preg_split — 通过一个正则表达式分隔字符串 php位值,解决 PHP 中 usort 在值相同时改变原始位置的问题 [PHP] inet_pton/inet_ntop IP地址转换函数 array_multisort() 多字段排序 PHPMailer设置utf8 PHPMailer字符集CharSet ADORecordSet对象 adodb手册 PHP 8.1 [鸟哥]PHP_INT_MIN 和 -9223372036854775808 opcache预加载 Composer的Packagist资源 mysql面试题 [鸟哥]PHP FFI详解 - 一种全新的PHP扩展方式 PHP7添加redis扩展 PHP获取指定函数定义在哪个文件中及行号 PHP mkdir()写出来的权限与mode值不符合 adodb连接mysql多个数据库的问题 composer基本用法利用php soap实现web service

略微加速

PHP官方手册 - 互联网笔记

Unix Domain Socket支持

更新日志

User Contributed Notes 3 notes