What I’m working on now: Poor man’s version of Speedtest.net

Intro
Now that I have a dual-band router I wanted to run some tests to see if 5 GHz is really faster and more stable than 2.4 GHz, as my intuition was telling me. But my only 5 GHz device where I had a chance to measure was my amazon Fired HD tablet, and wouldn’t you know that it’s incapable of running speedtest (speedtest.net). The web site forced it to a mobile app version, but amazon’s app store, being limited in its offerings, doesn’t have a speedtest app!

Anyway speedtest.net runs ads pretty aggressively, which I don’t like.

So I decided to try to write my own.

This turned out to be very hard to do. It turns out I suck at Javascript.

Some details
Normally I show all my false starts in the hopes that others can learn frmo my mistakes, but my Javascript blunders are just too painful and I never did sort them out. When I use javascript methods to set page timers I got completely inconsistent and hence unreliable results. So I settled on this simplistic PHP approach to gauge download speed:

<html>
<head>
</head>
<body>
<?php
// - DrJ 3/2017
// the weakness of this method is that it is a single stream
echo "Date: " . date('h:i:s') . "<br>\n";
$starttime = microtime(true);
for ($x = 0; $x < 750000; $x++) {
  $string .= mt_rand(1000000,9999999);
}
 
echo "<!-- $string -->\n";
//start again
//echo date('h:i:s');
echo "<div id='bottomtest'></div>\n";
$endtime = microtime(true);
$timediff = $endtime - $starttime;
$timediff = $timediff;
//echo "php timer: starttime: " . $starttime . " endtime: " . $endtime . " diff: " . $timediff . "<br>\n";
echo "Page load time: " . $timediff . " s<br>\n";
// 1.04 is observed overhead of IP + tcp. try ip -s link show eth0 before and after running curl
$dataset = 1.04*(strlen($string) + 200)/1000000.0;
$mbps = $dataset*8.0/$timediff;
echo "Mbytes downloaded in test: " . $dataset . " Mbytes<br>\n";
echo "Bandwidth: " . $mbps ." mbps<br>\n";
?>
<br><br>
<form>
<input type="submit" value="Test Again">
</form>
</html>

I called the file index.php and put it on my server in a directory of my choosing, let’s say, downloadtimer, and run it. The results look like this:

Date: 07:30:33
Page load time: 6.9666068553925 s
Mbytes downloaded in test: 5.460208 Mbytes
Bandwidth: 6.270149142432 mbps
 
Test again

To be continued…
References and related
Meanwhile a friend pointed out a couple superior speed test web sites. At&t’s Speedtest is a good choice. There are few if any ads, and it runs on my Fire HD tablet and it’s fun to watch. speedtest.att.com

This one seems only slightly less aggressive than speedtest.net: Internet Frog. Internet Frog works on my tablet but with limited functionality and a non-flashy interface.

This site is simplest of all so probably the best: fast.com. It’s run by Netflix who have an obvious interest in helping users establish what their download speed is. In fact it only measures download speed, which is a slight drawback. But no ads whatsoever.

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