Adam,
Thanks a lot. You are completely right.
I tested it on my modem, turned off and on Modem Compression option and checked the result.
I corrected my program using random data.
...............
URL url = new URL(web_site);
URLConnection connection = url.openConnection();
connection.setDoOutput(true);
connection.setUseCaches(false);
DataOutputStream dos = new DataOutputStream(connection.getOutputStream());
byte ab[] = createPacket(buffer_len);
int totalBytes = buffer_len;
int maxBufferSize = 51200;
int bytesAvailable = totalBytes;
int tempBufferSize = 0;
int bytesSent = 0;
int bufferSize = Math.min(bytesAvailable, maxBufferSize); while(bytesAvailable > 0){
dos.write(ab, 0, bufferSize);
bytesAvailable -= bufferSize;
bufferSize = Math.min(bytesAvailable, maxBufferSize);
}
dos.writeBytes("\r\n");
int totalBytesSent = dos.size();
System.out.println("\nTotal Bytes Sent: " + totalBytesSent);
dos.flush();
dos.close(); BufferedReader in = new BufferedReader(
new InputStreamReader(
connection.getInputStream()));
String inputLine; while ((inputLine = in.readLine()) != null){
// System.out.println(inputLine);
}
in.close();
endtime1 = System.currentTimeMillis();
test_time = endtime1 - starttime1; uploaded_size = totalBytesSent;
return showSpeed(starttime1,endtime1,"Upload",totalBytesSent);...............
private byte[] createPacket(int len) {
Random r = new Random();
byte[] pkt = new byte[len];
r.nextBytes(pkt);
return(pkt);
}
...............thanks again,
Ganbold
At 10:10 PM 5/12/2005, you wrote:
On Thu, 12 May 2005, Ganbold wrote:
Result is unbelievable, it is something like 500kbps for 56kbps Dial-Up connection, which is completely wrong.
It looks like the form data that the client is POSTing is all "a", correct? The modem is probably compressing this data.
I wrote a speed test in perl a number of years ago to do both upload and download testing. Here are some things I found, maybe they will help you:
You must use data that doesn't compress well, or, as you've seen, dial-up modems will compress it and report speeds much higher than is possible.
It is better to pre-generate the random data, rather than try and read from /dev/random on the fly. I realized that by having my script suck 5 or 10 megabytes of randomness out of /dev/random every time it ran, I was accelerating the heat-death of the universe. You don't want to cause the heat-death of the universe either, do you? (Actually, either pre-generate random files, or read from /dev/urandom, which doesn't block when it runs out of randomness)
IE Sucks.
The way my script worked was, I had a form page that the user selected the file size to test with, and hit Submit. This submitted to my CGI that generated a new HTML form with a hidden input field containing the random data of the size they selected. It also contained a hidden field with a timestamp of when the page began to execute. I used javascript to automatically submit the form when the page load completed. Mozilla would submit this form as soon as page load completed. For some odd reason, IE would wait a couple of seconds before submitting the data. So I had to (oh this is so ugly, I don't want to say it), define an IE fudge factor, and subtract a couple of seconds from the upload time if the client was IE.
I also realized that I had to add a META tag to cause the pages not to be cached. Furthermore, I had to add something to look at the client's HTTP headers and look for signs of an HTTP proxy (proxies usually add a header or two, depending on how they're configured). If a proxy was detected, I could either spit out a warning to the user that the speeds reported could be inaccurate, or I could simply refuse to continue.
On the plus side, overall the test worked pretty well.
HTH,
Adam _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
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