Re: [SR-Users] LCR "weight" column question

[Ricardo Martinez]

Hello Juha.
Thanks for your help.
The script works fine.  We made a test using the values "20 20 20 20 10
10" and it gave us the exact values that I calculated for the actual
gateways.

Device          Calls           %
GW02            520             1,04
GW03            502             1,01
GW05            12148           24,44
GW06            12276           24,70
GW09            12174           24,49
GW10            12074           24,29

Total           49694


So, we created another "weight" values and gave us the percentage we were
looking for.

18 18 18 18 16 16

That gaves us 20% 20% 20% 20% 10% and 10%.

So, we think it should be very useful if you can include this script in
the "utils", and maybe give more information in the REDME file of LCR
about the weight "column", until now we believe this column represents the
percentage of each gateway.

Thanks again,

Regards,
Ricardo.-



-----Mensaje original-----
De: Juha Heinanen [mailto:j...@tutpro.com]
Enviado el: domingo, 26 de septiembre de 2010 2:03
Para: Ricardo Martinez; us...@lists.kamailio.org
Asunto: Re: [SR-Users] LCR "weight" column question

ricardo,

i studied the weight problem a bit more and came to the conclusion that
implementing a fair weighting algorithm would be too complicated.

below is a script that can be used to find weight values matching
desired probabilities for lcr gateways.  i don't know if it would be
appropriate to include it in utils or scripts directory.

-- juha

#!/usr/bin/php
<?php

   // This script can be used to find out actual probabilities
   // that correspond to a list of LCR gateway weights.

if ($argc < 2) {
  echo "Usage: lcr_weight_test.php <list of weights (integers 1-254)>\n";
  exit;
 }

$iters = 10000;

$rands = array();
for ($i = 1; $i <= $iters; $i++) {
  $elem = array();
  for ($j = 1; $j < $argc; $j++) {
    $elem["$j"] = $argv[$j] * (rand() >> 8);
  }
  $rands[] = $elem;
 }

$sorted = array();
foreach ($rands as $rand) {
  asort($rand);
  $sorted[] = $rand;
 }

$counts = array();
for ($j = 1; $j < $argc; $j++) {
  $counts["$j"] = 0;
 }

foreach ($sorted as $rand) {
  end($rand);
  $counts[key($rand)]++;
 }

for ($j = 1; $j < $argc; $j++) {
  echo "weight " . $argv[$j] . " probability " . $counts["$j"]/$iters .
"\n";
 }

?>

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