upload speed test problem
Ganbold
ganbold at micom.mng.net
Fri May 13 00:36:25 GMT 2005
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
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