How to calculate http connections peak per second

According to Performance Tuning Guidelines for Large Deployments (HTTP) you should be able to calculate the number of http connections peak per second by taking a look at:

access_log files (The ones found at /opt/zimbra/log/ I suppose).

I suppose that it is a matter of a bash script with some of awk so that after taking out the day+hour I just leave the lines that have repeated hour+second string and just leave the ones that have more lines so that I get the peak by tunneling it to wc -l command.

Is the algorithm idea right?

Has anyone written this such a parser script? It would be nice if you could share it. Thank you.

I have managed to code the script.

I am having troubles creating wiki account (not Zimbra fault but mine). When I'm able to create it I will update the page's discussion so that someone hopefully includes the script in the official page.

Here there is how you run the script:

Code:

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cat access_log.2012-02-06 | awk -F ' ' '{print $4}' | awk -f access_log.awk

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.

And here there is the access_log.awk file contents:

Code:

---

BEGIN {
    FS=":"
    Peak = 1
    CurrentPeak = 0
    oldVar=""

}

{
  #printf ("Linea: %s\n", $0)
  hour = $2
  minute = $3
  second = $4
  #printf("hour: %s, minute: %s, second: %s\n",hour,minute,second)
  currentVar = hour minute second
  #printf ("currentVar definido: %s\n", currentVar)
  #printf ("oldVar definido: %s\n", oldVar)
  if ( currentVar == oldVar )
    {
      #printf ("1Current var vale: %s\n",currentVar)
      #print "CurrentVar es igual que oldVar"
      CurrentPeak ++
      if ( CurrentPeak > Peak)
        {
          Peak = CurrentPeak
          PeakLine = $0
        }
    } else

    {
      #printf ("2Current var vale: %s\n",currentVar)
      #print "CurrentVar es DIFERENTE de oldVar"
      CurrentPeak = 1
    }
  oldVar=currentVar
}

END {

print "Peak per second is: " Peak
print "Latest Peak line is: " PeakLine

}

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