Re: Runtime.getRuntime().exec() very slow in Java program.

Knute Johnson <>
Thu, 16 Apr 2009 13:22:07 -0700
<49e79335$0$25055$> wrote:

I am trying to run the Runtime.getRuntime().exec(shellCMD) to copy
files on a linux system.
but the getRuntime.exec() is very slow, it can only copy around 2-10
documents/second to my target directory when I have 1000 files. Can
anyone give some suggestions about my code below? thanks.

for (doc ahit : docList) {

             shellCMD="cp "+ srcDir + "/"+ ahit.doc_id + " " +
tarDumpDir; //copy xml to tmp folder
                Process process = Runtime.getRuntime().exec
            catch (Exception e){
             logError("Copy XML fail: " + e);

Just use the Java buffered streams with large buffers to do your copying.


Knute Johnson
email s/nospam/knute2009/

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