WordPress 缓存插件性能对比

WordPress 缓存插件性能对比

我想我应该收回之前文章 《如果要把网站做大，切忌 WordPress 的滥用》 的观点，虽然原生态的 WordPress 效率实在底下，但是 WordPress 提供了很多插件，国外服务器领域里也有很多开源的缓存软件，这几天在Jerry 的帮忙下，萝卜网的服务器用上了 Varnish 缓存加速，现在每天轻松应付流量，系统的负载也不再升高，呵呵。这里贴一篇国外高手的文章，一些主流的 WordPress 缓存插件，以及和用上 Varnish 的 WordPress 性能的对比。

原文《WordPress Cache Plugin Benchmarks》

1、作者使用的插件下载以及版本号：

DB Cache (version 0.6)
DB Cache Reloaded(version 2.0.2)
W3 Total Cache(version 0.8.5.1)
WP Cache (version 2.1.2)
WP Super Cache(version 0.9.9)
WP Widget Cache(version 0.25.2)
WP File Cache(version 1.2.5)
WP Varnish (in beta)
WP Varnish ESI Widget(in beta)

2、生产环境：

Debian 3.1/Squeeze VPS
Linux Kernel 2.6.33
Single core of a Xen Virtualized Xeon X3220 (2.40ghz)
2gb RAM
CoW file is written on a Raid-10 System using 4x1tb 7200RPM Drives
Apache 2.2.14 mpm-prefork
PHP 5.3.1
WordPress 官方主题测试数据
Tests are performed from a Quadcore Xeon machine connected via 1000 Base T on the same switch and /24 as the VPS machine

3、测试使用的Bash代码：

#!/bin/sh

FETCHES=1000
PARALLEL=10

/usr/sbin/apache2ctl stop
/etc/init.d/mysql restart
apache2ctl start
echo Sleeping
sleep 30
time (\
echo First Run;\
ab -n $FETCHES -c$PARALLEL http://example.com/;\
echo Second Run;\
ab -n $FETCHES -c$PARALLEL http://example.com/;\
\
echo First Run;\
./http_load -parallel $PARALLEL -fetches$FETCHES wordpresstest;\
echo Second Run;\
./http_load -parallel $PARALLEL -fetches$FETCHES wordpresstest;\
)

4、测试以下 URL 的 http_load：

http://example.com/

http://example.com/2010/03/hello-world/

http://example.com/2008/09/layout-test/

http://example.com/2008/04/simple-gallery-test/

http://example.com/2007/12/category-name-clash/

http://example.com/2007/12/test-with-enclosures/

http://example.com/2007/11/block-quotes/

http://example.com/2007/11/many-categories/

http://example.com/2007/11/many-tags/

http://example.com/2007/11/tags-a-and-c/

http://example.com/2007/11/tags-b-and-c/

http://example.com/2007/11/tags-a-and-b/

http://example.com/2007/11/tag-c/

http://example.com/2007/11/tag-b/

http://example.com/2007/11/tag-a/

http://example.com/2007/09/tags-a-b-c/

http://example.com/2007/09/raw-html-code/

http://example.com/2007/09/simple-markup-test/

http://example.com/2007/09/embedded-video/

http://example.com/2007/09/contributor-post-approved/

http://example.com/2007/09/one-comment/

http://example.com/2007/09/no-comments/

http://example.com/2007/09/many-trackbacks/

http://example.com/2007/09/one-trackback/

http://example.com/2007/09/comment-test/

http://example.com/2007/09/a-post-with-multiple-pages/

http://example.com/2007/09/lorem-ipsum/

http://example.com/2007/09/cat-c/

http://example.com/2007/09/cat-b/

http://example.com/2007/09/cat-a/

http://example.com/2007/09/cats-a-and-c/

5、最终性能对比：

Sorted in Ascending order in terms of higher overall performance

Addon	Apachebench	Cold Start Warm Start	http_load	Cold Start Warm Start
	Req/Second	Time/Request	50% within x ms	Fetches/Second	Min First Response	Avg First Response
Baseline	4.97	201.006	2004	15.1021	335.708	583.363
	5.00	200.089	2000	15.1712	304.446	583.684
DB Cache	4.80	208.436	2087	15.1021	335.708	583.363
Cached all SQL queries	4.81	207.776	2091	15.1712	304.446	583.684
DB Cache	4.87	205.250	2035	14.1992	302.335	621.092
Out of Box config	4.94	202.624	2026	14.432	114.983	618.434
WP File Cache	4.95	201.890	2009	15.8869	158.597	549.176
	4.99	200.211	2004	16.1758	99.728	544.107
DB Cache Reloaded	5.02	199.387	1983	15.0167	187.343	589.196
All SQL Queries Cached	5.03	200.089	1985	14.9233	150.145	586.443
DB Cache Reloaded	5.06	197.636	1968	14.9697	174.857	589.161
Out of Box config	5.08	196.980	1968	15.181	257.533	587.737
Widgetcache	6.667	149.903	1492	15.0264	245.332	602.039
	6.72	148.734	1487	15.1887	299.65	598.017
W3 Total Cache	153.45	65.167	60	133.1898	8.916	85.7177
DB Cache off, Page Caching with Memcached	169.46	59.011	57	188.4	9.107	50.142
W3 Total Cache	173.49	57.639	52	108.898	7.668	86.4077
DB Cache off, Minify Cache with Memcached	189.76	52.698	48	203.522	8.122	43.8795
W3 Total Cache	171.34	58.364	50	203.718	8.097	44.1234
DB Cache using Memcached	190.01	52.269	48	206.187	8.186	42.4438
W3 Total Cache	175.29	57.048	48	87.423	7.515	107.973
Out of Box config	191.15	52.314	47	204.387	8.288	43.217
W3 Total Cache	175.29	57.047	51	204.557	8.199	42.9365
Database Cache using APC	191.19	52.304	48	200.612	8.11	44.6691
W3 Total Cache	114.02	87.703	49	114.393	8.206	82.0678
Database Cache Disabled	191.76	52.150	49	203.781	8.095	42.558
W3 Total Cache	175.80	56.884	51	107.842	7.281	87.2761
Database Cache Disabled, Minify Cache using APC	192.01	52.082	50	205.66	8.244	43.1231
W3 Total Cache	104.90	95.325	51	123.041	7.868	74.5887
Database Cache Disabled, Page Caching using APC	197.55	50.620	46	210.445	7.907	41.4102
WP Super Cache	336.88	2.968	16	15.1021	335.708	583.363
Out of Box config, Half On	391.59	2.554	16	15.1712	304.446	583.684
WP Cache	161.63	6.187	12	15.1021	335.708	583.363
	482.29	20.735	11	15.1712	304.446	583.684
WP Super Cache	919.11	1.088	3	190.117	1.473	47.9367
Full on, Lockdown mode	965.69	1.036	3	975.979	1.455	9.67185
WP Super Cache	928.45	1.077	3	210.106	1.468	43.8167
Full on	970.45	1.030	3	969.256	1.488	9.78753
W3 Total Cache	1143.94	8.742	2	165.547	0.958	56.7702
Page Cache using Disk Enhanced	1222.16	8.182	3	1290.43	0.961	7.15632
W3 Total Cache	1153.50	8.669	3	165.725	0.916	56.5004
Page Caching – Disk Enhanced, Minify/Database using APC	1211.22	8.256	2	1305.94	0.948	6.97114
Varnish ESI	2304.18	0.434	4	349.351	0.221	28.1079
	2243.33	0.44689	4	4312.78	0.152	2.09931
WP Varnish	1683.89	0.594	3	369.543	0.155	26.8906
	3028.41	0.330	3	4318.48	0.148	2.15063

6、总结：

Varnish 用来做缓存，因为是内存级别的，读取速度相当之快，所有其他的缓存插件都是浮云，唯一能媲美的是启用了Page Caching – Disk (Enhanced), Minify Caching – Alternative PHP Cache (APC), Database Caching – Alternative PHP Cache (APC)的 W3 Total Cache 插件。

萝卜网目前使用的方案是 Nginx （82端口） + Varnish （反向监听81）+ Nginx （再反向监听80），当然也可以尝试 Apache （82）+ Varnish（81） + Nginx （80），具体怎么配置就不是本文的讨论范围了。

至于为什么不用 Apache （81） + Nginx （80），因为 Nginx 用来做反向代理+缓存加速的话，是在硬盘读取的，而Varnish直接读取内存，速度明显加快，唯一头疼的就是太损耗内存，服务器8G的内存瞬间跑满，看来得花钱加大内存了 T_T

ref http://zou.lu/wordpress-cache-plugin-benchmarks/