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Retrieving System Information With patSysinfo
By: icarus, (c) Melonfire
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    2004-02-16


    Table of Contents:
  • Retrieving System Information With patSysinfo
  • Plug and Play
  • What's in a Name?
  • Up and at 'Em
  • Carrying the Load
  • A Nifty Device
  • Running Out of RAM
  • Mounting Up
  • Link Zone

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    Retrieving System Information With patSysinfo - Carrying the Load
    (Page 5 of 9 )

    If it's system performance you're interested in, patSysinfo can give you that as well. Consider the getLoadAvg() method, which returns the average CPU load for the last 1, 5 and 15 minutes, or the getNumberUsers() function, which returns the number of users currently logged in to the system.


    <?php 
     
    // include class
    include("patSysinfo.php"); 
     
    // instantiate object
    $sys = new patSysinfo();
     
    // get load average
    // returns array of 3 values
    $loadArray = $sys->getLoadAvg();
     
    // get number of users
    $users = $sys->getNumberUser();
     
    // output values 
    echo "Load averages " . $loadArray[0] . " (1 min) " . $loadArray[1] . " (5 min) " . $loadArray[2] . " (15 min), $users users"; 
    ? >

    Here's the output:

    Load averages 0.01 (1 min) 2.11 (5 min) 1.43 (15 min), 12 users

    You can obtain a list of all running processes with the getProcesses() method, equivalent to the UNIX "ps" command. The list of processes is returned as an array, each element of which represents a running process and contains details on that process' owner, ID, current status and resource usage. Consider the following example, which illustrates:


    <html>
     
    <head>
     
    </head>
      
    <body>
        
    <table border="1" cellspacing="0" cellpadding="5">
          
    <tr>
            
    <td><u>Process ID</u></td>
            
    <td><u>Command</u></td>
            
    <td><u>Owner</u></td>
            
    <td><u>Terminal</u></td>
            
    <td><u>Status</u></td>
            
    <td><u>Start</u></td>
            
    <td><u>Duration</u></td>
            
    <td><u>CPU %</u></td>
            
    <td><u>Memory %</u></td>
          
    </tr>
    <?php
     
    // include class
    include("patSysinfo.php"); 
     
    // instantiate object
    $sys = new patSysinfo(); 
     
    // get process list
    $processes = $sys->getProcesses(); 
     
    foreach ($processes as $p)
    {
     
    echo "<tr>";
     
    echo "<td>" $p[pid] . "</td>";
     
    echo "<td>" $p[command] . "</td>";
     
    echo "<td>" $p[user] . "</td>";
     
    echo "<td>" $p[tty] . "</td>";
     
    echo "<td>" $p[stat] . "</td>";
     
    echo "<td>" $p[start] . "</td>";
     
    echo "<td>" $p[time] . "</td>";
     
    echo "<td>" $p[cpu] . "</td>";
     
    echo "<td>" $p[mem] . "</td>";
     
    echo "</tr>";
    }
    ? >
    </table>
    </body>
    </html>

    And here's what the output looks like:

    patSysinfo

    A variant of this is the getTopProcesses() method, which returns the same output as getProcesses() but sorts the data by CPU usage. Here's the script,


    <html>
    <head>
    </head>
    <body>
      
    <table border="1" cellspacing="0" cellpadding="5">
        
    <tr>
        
    <td><u>Process ID</u></td>
        
    <td><u>Command</u></td>
        
    <td><u>Owner</u></td>
        
    <td><u>Terminal</u></td>
        
    <td><u>Status</u></td>
        
    <td><u>Start</u></td>
        
    <td><u>Duration</u></td>
        
    <td><u>CPU %</u></td>
        
    <td><u>Memory %</u></td>
     
    </tr>
    <?php
    // include class
    include("patSysinfo.php");
     
    // instantiate object
    $sys = new patSysinfo();
     
    // get process list
    $processes = $sys->getTopProcesses(); 
     
    foreach ($processes as $p)
    {
     
    echo "<tr>";
     
    echo "<td>" $p['pid'] . "</td>";
     
    echo "<td>" $p['command'] . "</td>";
     
    echo "<td>" $p['user'] . "</td>";
     
    echo "<td>" $p['tty'] . "</td>";
     
    echo "<td>" $p['stat'] . "</td>";
     
    echo "<td>" $p['start'] . "</td>";
     
    echo "<td>" $p['time'] . "</td>";
     
    echo "<td>" $p['cpu'] . "</td>";
     
    echo "<td>" $p['mem'] . "</td>";
     
    echo "</tr>";
    }
    ? >
    </table>
    </body>
    </html>

    and here's the output:

    patSysinfo

    For script such as these, which retrieve real-time information from the system, it's a good idea to insert an auto-refresh header at the top of the page, so that the page automatically updates itself with the latest information at a user-specified interval.



     
     
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