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Calculating upload speed

Posted on 2004-08-24
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Last Modified: 2011-10-03
hi.

I'm trying to calculate my upload speed so I can do an auto configure on my app.  This is how I do it but it does not seem to give me anywhere near my actual upload speed (I checked on DSLREPORTS.com)

1. create a buffer of 500,000 bytes
2. Start timer .. start = ::GetTickcout() and send data to server
3. wait for response from server telling me it's got all the data
4. end timer end = ::GetTickcout() and deduct any overhead from the server to process to data.
5. calculate like so ... (500,000 / (end - start) ) / 1024 = XXKB upload

my upload is usual around 200k+ but using this method gives me a result of 20k .. Any ideas ???

Thanks
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Question by:alsmorris
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Expert Comment

by:drichards
Comment Utility
Do you convert GetTickCount() - I assume that's what you mean - to seconds?  Seems formula should be:

(500,000/(end-start)*1000)/1024

to account for the fact that GetTickCount() is in milliseconds.
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by:itsmeandnobodyelse
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Are you sure that 200k+ is 200 KBytes/sec. If it is 200 KBits/sec ~= 25KBytes/sec the results could be explained.

Did you wait 2-3 seconds or 20-30 seconds for output?

Regards, Alex
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by:grg99
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Most home connections are setup with 75% of the bandwidth allocated for DOWNLAODS to your computer, and only the rest for uploads.  This matches most people's needs (lots of stuff coming to your computer, jsut a little typing going back).

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Author Comment

by:alsmorris
Comment Utility
drichards yes sorry I do convert to seconds before I do the calculation.

Alex - I have ran my test at www.dslreports.com/stest .. well I have cable not DSL but it still works there ...  Here is the results I just ran there .. it takes about 27sec to return.

2004-08-25 12:05:07 EST: 1416 / 229
Your download speed : 1450188 bps, or 1416 kbps.
A 177 KB/sec transfer rate.
Your upload speed : 235233 bps, or 229 kbps.


Here is the actual code:

int CTestUpload::RunUploadTest()
{

      CProtocol* pServerProtocol = new CProtocol;
      DWORD dwAmountOfData = 500000;
      char* pszData = new char[dwAmountOfData] ;
      memset(pszData,33,dwAmountOfData);

      DWORD dwStartTime = ::GetTickCount(); //start time ms

               //Sends packet to server and returns on response
      pServerProtocol->CreateRequest(pszData,dwAmountOfData);

      DWORD dwEndTime = ::GetTickCount(); //endtime ms
      //Overhead send back from server
      int noverhead = atoi(pServerProtocol->m_pDataFromServer); //already in secs

      float dwTimeTaken = (float)(dwEndTime - dwStartTime) / 1000.00;
      
      float dblKBSec = (float)(dwAmountOfData / (dwTimeTaken - noverhead) ) / 1024.00;


      if (pszData)
      {
            delete [] pszData;
            pszData = NULL;
      }
      if (pServerProtocol)
      {
            delete pServerProtocol;
            pServerProtocol = NULL;
      }

      return 0;

}
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Accepted Solution

by:
itsmeandnobodyelse earned 220 total points
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Upload speed 229 kbps ~= 27KB/sec

That isn't far away from your results? As grg99 already told you, upload speed normally is much less than download speed, and you are uploading, don't you?

Regards, Alex




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Author Comment

by:alsmorris
Comment Utility
Hi Alex...

ok .. I'm getting it !  I got mixed up.. So the  calc is actually 229 kbps * 8 (bits per byte) = KB/sec.  ??

Thanks

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by:itsmeandnobodyelse
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Yes, but maybe you have to divide rather than to multiply ;-)

     229 kilobits/second  divided by  8 == 28.625 kilobytes/second

Regards, Alex
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Author Comment

by:alsmorris
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:) Oh yeah :P
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Assisted Solution

by:grg99
grg99 earned 30 total points
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Also, what's the point of using 1024 instead of 1000?  

1024 makes sense when you're dealing with things that come in binary powers. But thruput is just a number.

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Author Comment

by:alsmorris
Comment Utility
grg.. I guess your right .. Just trying to get an idea of how much data I can safely send.

by the way anyone know what the upload speed is for a 56k modem ?

Thanks
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Author Comment

by:alsmorris
Comment Utility
according to a website I found a V90 56k modem can upload at 33.6kbps if anyone is interested ... Thank everyone for the help!!! I'll close out this question!
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