Linux一次删除一百万个文件的最快方法

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环境：

• CPU: Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz

• MEM: 4G

• HD: ST3250318AS: 250G/7200RPM

使用 –delete 和 –exclude，你可以选择性删除符合条件的文件。还有一点，当你需要保留这个目录做其它用处时，这种方法是再适合不过了。

重新测评

几天前，Keith-Winstein在回复Quora上的这个帖子时说我之前的测评无法复制，因为操作的时间持续的太久。我澄清一下，这些数据过大，可能是因为我的计算机在过去的几年里做的事太多，测评中可能存在一些文件系统错误。但我不确定是这些原因。现在好了，我弄了一天比较新的计算机，把测评再做一次。这次我使用/usr/bin/time，它能提供更详细的信息。下面就是新的结果。

(每次都是1000000个文件。每个文件的体积都是0。)

原始输出

# method 1~/test $ /usr/bin/time -v  rsync -a --delete empty/ a/        Command being timed: "rsync -a --delete empty/ a/"        User time (seconds): 1.31        System time (seconds): 10.60        Percent of CPU this job got: 95%        Elapsed (wall clock) time (h:mm:ss or m:ss): 0:12.42        Average shared text size (kbytes): 0        Average unshared data size (kbytes): 0        Average stack size (kbytes): 0        Average total size (kbytes): 0        Maximum resident set size (kbytes): 0        Average resident set size (kbytes): 0        Major (requiring I/O) page faults: 0        Minor (reclaiming a frame) page faults: 24378        Voluntary context switches: 106        Involuntary context switches: 22        Swaps: 0        File system inputs: 0        File system outputs: 0        Socket messages sent: 0        Socket messages received: 0        Signals delivered: 0        Page size (bytes): 4096        Exit status: 0# method 2        Command being timed: "find b/ -type f -delete"        User time (seconds): 0.41        System time (seconds): 14.46        Percent of CPU this job got: 52%        Elapsed (wall clock) time (h:mm:ss or m:ss): 0:28.51        Average shared text size (kbytes): 0        Average unshared data size (kbytes): 0        Average stack size (kbytes): 0        Average total size (kbytes): 0        Maximum resident set size (kbytes): 0        Average resident set size (kbytes): 0        Major (requiring I/O) page faults: 0        Minor (reclaiming a frame) page faults: 11749        Voluntary context switches: 14849        Involuntary context switches: 11        Swaps: 0        File system inputs: 0        File system outputs: 0        Socket messages sent: 0        Socket messages received: 0        Signals delivered: 0        Page size (bytes): 4096        Exit status: 0# method 3find c/ -type f | xargs -L 100 rm~/test $ /usr/bin/time -v ./delete.sh        Command being timed: "./delete.sh"        User time (seconds): 2.06        System time (seconds): 20.60        Percent of CPU this job got: 54%        Elapsed (wall clock) time (h:mm:ss or m:ss): 0:41.69        Average shared text size (kbytes): 0        Average unshared data size (kbytes): 0        Average stack size (kbytes): 0        Average total size (kbytes): 0        Maximum resident set size (kbytes): 0        Average resident set size (kbytes): 0        Major (requiring I/O) page faults: 0        Minor (reclaiming a frame) page faults: 1764225        Voluntary context switches: 37048        Involuntary context switches: 15074        Swaps: 0        File system inputs: 0        File system outputs: 0        Socket messages sent: 0        Socket messages received: 0        Signals delivered: 0        Page size (bytes): 4096        Exit status: 0# method 4find d/ -type f | xargs -L 100 -P 100 rm~/test $ /usr/bin/time -v ./delete.sh        Command being timed: "./delete.sh"        User time (seconds): 2.86        System time (seconds): 27.82        Percent of CPU this job got: 89%        Elapsed (wall clock) time (h:mm:ss or m:ss): 0:34.32        Average shared text size (kbytes): 0        Average unshared data size (kbytes): 0        Average stack size (kbytes): 0        Average total size (kbytes): 0        Maximum resident set size (kbytes): 0        Average resident set size (kbytes): 0        Major (requiring I/O) page faults: 0        Minor (reclaiming a frame) page faults: 1764278        Voluntary context switches: 929897        Involuntary context switches: 21720        Swaps: 0        File system inputs: 0        File system outputs: 0        Socket messages sent: 0        Socket messages received: 0        Signals delivered: 0        Page size (bytes): 4096        Exit status: 0# method 5~/test $ /usr/bin/time -v rm -rf f        Command being timed: "rm -rf f"        User time (seconds): 0.20        System time (seconds): 14.80        Percent of CPU this job got: 47%        Elapsed (wall clock) time (h:mm:ss or m:ss): 0:31.29        Average shared text size (kbytes): 0        Average unshared data size (kbytes): 0        Average stack size (kbytes): 0        Average total size (kbytes): 0        Maximum resident set size (kbytes): 0        Average resident set size (kbytes): 0        Major (requiring I/O) page faults: 0        Minor (reclaiming a frame) page faults: 176        Voluntary context switches: 15134        Involuntary context switches: 11        Swaps: 0        File system inputs: 0        File system outputs: 0        Socket messages sent: 0        Socket messages received: 0        Signals delivered: 0        Page size (bytes): 4096        Exit status: 0

我真的十分好奇为什么Lee的方法要比其它的快，竟然比rm -rf也要快。

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