Mathemathical download time equation?

[dominic]

Hiya!
I've been doing some random poop lately and I wanted to figure out how I could make an equation that would take both server #1 and server #2's internet speed into consideration while simulating a download
(Not a real download, pls just simulating)
So for example
Server #1 hosts the file and has 500 mbit/s
Server #2 wants to download Server #1's file and it's only got 100mbit/s
The filesize is 2810000kbit (2,8 GB). My brain just totally died when trying to do his...

Thanks in advance,
Dominic

 

[Aesir]

Your final download will be 100 mbit/s (12,5 mb/s if we want to follow google convertion) and your download time will be [2810000*(10^-3)]/12,5 mb/s (but im really sure that something is wrong, even though the calcs should be corrects)

 

[Negata]

time = size / speed = filesize / min(server1speed, server2speed)

Just make sure all values use the same unit (kbit/mbit/kb/mb, whatever you choose). In practice maximum speed won't be reached so add some percentage to the result.

 

[dominic]

time = size / speed = filesize / min(server1speed, server2speed)

Just make sure all values use the same unit (kbit/mbit/kb/mb, whatever you choose). In practice maximum speed won't be reached so add some percentage to the result.

It's simulating a download/upload speed. It's like Slavehack or Hackerexperience :
I ended up doing it like this:

<?php
function calc($size, $a, $b) {
    $speed = 0;
    if ($a < $b) {
        $speed = $a;
    } else {
        $speed = $b;
    }
    return $size / ($speed / 8);
}
echo gmdate("H:i:s", calc(2800, 100, 500));
?>