同时对多个文件进行大量写操作对性能优化_Asp.Net开发技巧

时间：2010-09-16 来源：蔚蓝的大海

我自己的一个项目，需要同时对65536个文件进行多次写操作。

如果先全部打开所有的文件，然后重复写，最后关闭所有的文件。那么第一次写操作全部完成需要16分钟左右，而第二次就需要40分钟了。没有继续测试了。

            for (int i = 0; i < 65536; i++)
            {
                fileStream[i] = new FileStream(buffDir+"\\"+ i.ToString() + ".dat", FileMode.Create,FileAccess.Write, FileShare.Write,14000);
            }
             write;
                write;
                write;
                ........
               for (int i = 0; i < 65536; i++)
            {
                fileStream[i] .close();
            }

如果在写操作的时候只打开相应的一个文件，写完关闭。那么所有写操作完成只要2分30秒左右。

循环
｛
for (int i=0;i<65536;i++)
{
open;
write;
close;
}
｝

由此可见，第二种办法性能要远大于第一种。一次打开所有的文件，需要占用不小的内存，最主要的是.net在处理filestream 的时候，可能要进行大量的内存分配和回收等工作，消耗了大量内存和资源。

另外我也做个测试，如果文件数目比较小，那么第一种的性能又要大大好于第二种。

http://xiyangwushi.cnblogs.com/archive/2006/06/28/437409.html

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