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What are the advantages and disadvantages of PHP file cache compared to memcached cache?

Source: Internet
Author: User
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 如果不考虑其他任何问题，只比较速度的话，那肯定是mem快，但他们各有优缺点。 文件缓存优点： 1、由于现在的硬盘都非常大，所有如果是大数据的时候，放硬盘里就比较合适，比如做一个cms网站，网站里有10万篇文章，生成的文件大小总数可能就会很大。 2、数据的存放较为安全，由于是硬盘存放，所以在意外掉电的情况下，缓存文件不会丢失。 3、易于扩展，如果硬盘不够用，可以更换大硬盘或者添加硬盘，在容量上受的限制很小。 文件缓存缺点： 1、高并发时，硬盘的读写性能大幅度降低。 2、网站pv持续很高的情况下，硬盘寿命大大降低。memcached优点： 1、读写性能优异，特别是高并发时和文件缓存比有明显优势。 2、memcached组建支持集群，并且是自动管理负载均衡。 memcached缺点： 1、缓存空间有限：据说一台电脑的mem缓存开到2g以上会出现不稳定，数据无故丢失的现象。 2、掉电丢失数据：由于是把数据放在内存里的，所有一旦机器掉电，数据也就全部丢失了。一般建议：如果是做内容缓存的话，比如把一些不经常更改的文章放在文件缓存里比较合适，而mem则适合放一些频繁更改的数据，比如可以把session数据放进mem。

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