We are experiencing a very strange problem with HTTP uploads on jboss4/tomcat.
When uploading large files from IE over the network, upload speed is capped at
about 70kbytes/sec even though the network allows for much higher speeds.
Neither CPU nor disk access appears to be the bottleneck. When using FireFox
browser, upload speed is about 4000kbytes/sec. When using IE from the server
through loopback adapter, speed is 7000kbytes/sec.
This problem is happening on 2 separate servers. One is a win 2000 box with a
freshly installed OS. The other one is a brand new windows server 2003
enterprise edition.
There is one machine which runs file-for-file identical jboss installation
under the same version of java. When accessing that machine with IE from other
boxes, uploads go fast.
I tried apache fileupload library and o'reilly MultipartRequest. I also tried
reading directly from InputStream with this JSP page:
| <%@ page import = "java.util.*" %>
| <%@ page import = "java.io.*" %>
| <%
| InputStream is = request.getInputStream();
| byte buffer[]=new byte[128*1024];
| int bytes=0;
| int total=0;
| long totalbytes=0;
| long t1=System.currentTimeMillis();
| while (0 < (bytes = is.read(buffer))) {
| total++;
| totalbytes+=bytes;
| }
| long t2=1+System.currentTimeMillis();
| %>
|
| <%if (total > 0) {%>
| time(ms): <%=t2-t1%><br>
| total buffer reads: <%=total%><br>
| total bytes: <%=totalbytes%><br>
| chunks per second: <%=total*1000/(t2-t1)%><br>
| bytes per second: <%=totalbytes*1000/(t2-t1)%><br>
| average bytes per chunk: <%=totalbytes/total%><br>
| <%}%>
|
| <form method=post ENCTYPE="multipart/form-data">
| <input type=file name=a>
| <input type=submit>
| </form>
|
I cannot figure out what's different between the machine on which it works and
the two on which it doesn't. Any ideas?
-- Mike
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