title: Limit to number of files to cp in parallel
body: <p>Im running the gsutil cp command in parallel (with the -m option) on a directory with 25 4gb json files (that i am also compressing with the -z option). </p>
  
  <pre><code>gsutil -m cp -z json -R dir_with_4g_chunks gs://my_bucket/
  </code></pre>
  
  <p>When I run it, it will print out to terminal that it is copying all but one of the files. By this I mean that it prints one of these lines per file:</p>
  
  <pre><code>Copying file://dir_with_4g_chunks/a_4g_chunk [Content-Type=application/octet-stream]...
  </code></pre>
  
  <p>Once the transfer for one of them is complete, it says that it'll be copying the last file. </p>
  
  <p>The result of this is that there is one file that only starts to copy only when one of the others finishes copying, significantly slowing down the process</p>
  
  <p>Is there a limit to the number of files I can upload with the -m option? Is this configurable in the boto config file?</p>