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POWhen executing "tar" on a directory with over a billion files, the process stayed in D status
 

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    <p>I was doing some experiments to learn more about Linux process states. </p> <p>So, there's a directory(named big_dir) with over a billion files in it(the directory has many sub-directories recursively), and then I run <code>tar -cv big_dir | ssh anotherServer "tar -xv -C big_dir"</code> and found out via executing <code>top</code> that, the <code>tar</code> process stays in D status. Meanwhile, the tar command keeps outputting the paths of the files.</p> <p>I know that, the process was in D status because it was doing disk I/O, but why didn't its status keep switching between D and R? Printing the file names under the directory must have used some CPU computation, isn't it? Otherwise how could the find command know that it should print something?</p> <p>If I run <code>dd if=/dev/zero of=/dev/null</code>, then the <code>dd</code> process status kept in R status from the <code>top</code> output. But why wasn't it in D status? Wasn't it doing I/O all the time?</p>
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