How to get “requests per second” for Apache in Linux?

Question

In Windows for ASP, you can get it perfmon, but...

How to get \"requests per second\" for Apache in Linux?

Answer 1

I didn't like any of the solutions I found, so I wrote my own.

• mod_status isn't really accurate enough. It's based on how long the server is up, which in our case is normally months. What I'm looking for is traffic spikes.
• the shell script above uses a sleep() statement which isn't ideal as it takes x seconds to actually retrieve the data.

So this solution takes a particular line in the access_log 15000 requests ago, and uses the time recorded to compare with the current time.

# This check is needed because if the logs have just rolled over, then we need a minimum
# amount of data to report on.
# You will probably need to adjust the 3500000 - this is roughly the file size when the
# log file hits 15000 requests.
FILESIZE=`ls -l /var/log/httpd/access_log | awk '{print $5}' `
if [ $FILESIZE -le 3500000 ]
then
        # not enough data - log file has rolled over
        echo "APACHE_RPS|0"
else
        # Based on 15000 requests.  Depending on the location of the date field in
        # your apache log file you may need to adjust the ...substr($5... bit
        LASTTIME=`tail -15000 /var/log/httpd/access_log | head -1 | awk '{printf("%s\n",substr($5,2,20));}' `
        APACHE_RPS=`echo $LASTTIME | gawk -vREQUESTS=15000 ' {
                # convert apache datestring into time format accepted by mktime();
                monthstr = substr($0,4,3);
                if(monthstr == "Jan"){ monthint = "01"; }
                if(monthstr == "Feb"){ monthint = "02"; }
                if(monthstr == "Mar"){ monthint = "03"; }
                if(monthstr == "Apr"){ monthint = "04"; }
                if(monthstr == "May"){ monthint = "05"; }
                if(monthstr == "Jun"){ monthint = "06"; }
                if(monthstr == "Jul"){ monthint = "07"; }
                if(monthstr == "Aug"){ monthint = "08"; }
                if(monthstr == "Sep"){ monthint = "09"; }
                if(monthstr == "Oct"){ monthint = "10"; }
                if(monthstr == "Nov"){ monthint = "11"; }
                if(monthstr == "Dec"){ monthint = "12"; }
                mktimeformat=sprintf("%s %s %s %s %s %s [DST]\n", substr($0,8,4), monthint, substr($0,1,2), substr($0, 13,2), substr($0, 16,2), substr($0, 19,2) );
                # calculate difference
                difference = systime() - mktime(mktimeformat);
                # printf("%s - %s = %s\n",systime(), mktime(mktimeformat), difference);
                printf("%s\n",REQUESTS/difference);
        } ' `

        echo "APACHE_RPS|${APACHE_RPS}"
fi