关于php读取文件的性能问题
背景：
合并请求，用combo把一堆小的CSS和JS合并输出
方法
- 循环读取每个小文件，直接输出
- 存在cache文件 ? 读取cache文件，输出 : 循环读取每个小文件，输出并保存为cache文件
结果
我觉得第二种方法应该比较好，但实测第二种表现不太稳定，时而很快，时而很慢（都cache了）。这是为什么呢？是因为不能同时读取同一个文件么？还是php更适合读取多个小文件？
btw，都是禁用浏览器缓存的情况。
回复内容：
背景：
合并请求，用combo把一堆小的CSS和JS合并输出
方法
- 循环读取每个小文件，直接输出
- 存在cache文件 ? 读取cache文件，输出 : 循环读取每个小文件，输出并保存为cache文件
结果
我觉得第二种方法应该比较好，但实测第二种表现不太稳定，时而很快，时而很慢（都cache了）。这是为什么呢？是因为不能同时读取同一个文件么？还是php更适合读取多个小文件？
btw，都是禁用浏览器缓存的情况。
php里对于文件的并发读取非常不稳定 常常读写冲突造成文件锁死
我建议不要实时去处理这个问题, 可以参见rails中的assets pipeline, 对css/js进行预编译 每次页面响应时都加载预编译好的js/css, 更新代码时重新生成
另外也可以灵活的使用Tengine中的ngxhttpconcat_module模块 或 apache中的mod_concat模块进行这些合并压缩处理
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