PHP Memory Checker

**GamingHybrid** · July 26th, 2007, 2:59 AM

I'm trying to do a "if" statement where the PHP checks on the server's memory usage and performs actions based on the amount.

For example, if it could find the usage of memory in percentage values, then I'd have an if statement tha would...

PHP Code:


			
if (memory => low) { 

/* show content */ 

} elseif (memory => medium) { 

/* show limited content */ 

} elseif (memory =< high) { 

/* block access */ 

}

So, would anyone know the right type of method to find the memory usage and then create a similar if statement?

Thank you

**cowboy** · July 26th, 2007, 7:31 AM

Memory is physical and swap, so you need to determine the criteria you wish to compare when you indicate values like low, medium, high. I graph my server memory and keep my eye on a constant System, currently around 40%, and a very low swap file.

If I were to use an if() statement to determine tasks I suppose I would use the swap file as the deciding factor: low < 5%; high > 70%.

You will find memory usage in the file meminfo in the proc directory.

Sample:

Code:

MemTotal:       451100 kB
MemFree:         21956 kB
Buffers:         76644 kB
Cached:         170976 kB
SwapCached:      19332 kB
Active:         244424 kB
Inactive:       127024 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:       451100 kB
LowFree:         21956 kB
SwapTotal:     2048276 kB
SwapFree:      1962216 kB
Dirty:            1216 kB
Writeback:           0 kB
Mapped:         139048 kB
Slab:            50756 kB
Committed_AS:   443792 kB
PageTables:       2240 kB
VmallocTotal:   565240 kB
VmallocUsed:      3644 kB
VmallocChunk:   561348 kB
HugePages_Total:     0
HugePages_Free:      0
Hugepagesize:     4096 kB

and the size of the swap files in the file swaps in the proc directory.

Sample:

Code:

Filename    Type  Size Used Priority
/dev/hda3                               partition 2048276 86060 -1
Filename    Type  Size Used Priority
/dev/hda3                               partition 2048276 86060 -1
Filename    Type  Size Used Priority
/dev/hda3                               partition 2048276 86060 -1
Filename    Type  Size Used Priority
/dev/hda3                               partition 2048276 86060 -1
Filename    Type  Size Used Priority
/dev/hda3                               partition 2048276 86060 -1

Sample Code function to yield Physical memory (System, Buffered, & Cached) and Swap (Total & Available):

PHP Code:


			
<?
  function memory () {
    if ($fd = fopen('/proc/meminfo', 'r')) {
      $results['ram'] = array();
      $results['swap'] = array();
      $results['devswap'] = array();
      while ($buf = fgets($fd, 4096)) {
        if (preg_match('/^MemTotal:\s+(.*)\s*kB/i', $buf, $ar_buf)) {
          $results['ram']['total'] = $ar_buf[1];
        } else if (preg_match('/^MemFree:\s+(.*)\s*kB/i', $buf, $ar_buf)) {
          $results['ram']['t_free'] = $ar_buf[1];
        } else if (preg_match('/^Cached:\s+(.*)\s*kB/i', $buf, $ar_buf)) {
          $results['ram']['cached'] = $ar_buf[1];
        } else if (preg_match('/^Buffers:\s+(.*)\s*kB/i', $buf, $ar_buf)) {
          $results['ram']['buffers'] = $ar_buf[1];
        } else if (preg_match('/^SwapTotal:\s+(.*)\s*kB/i', $buf, $ar_buf)) {
          $results['swap']['total'] = $ar_buf[1];
        } else if (preg_match('/^SwapFree:\s+(.*)\s*kB/i', $buf, $ar_buf)) {
          $results['swap']['free'] = $ar_buf[1];
        } 
      } 
      fclose($fd);
      $results['ram']['t_used'] = $results['ram']['total'] - $results['ram']['t_free'];
      $results['ram']['percent'] = round(($results['ram']['t_used'] * 100) / $results['ram']['total']);
      $results['swap']['used'] = $results['swap']['total'] - $results['swap']['free'];
      $results['swap']['percent'] = round(($results['swap']['used'] * 100) / $results['swap']['total']);
 
      // values for splitting memory usage
      if (isset($results['ram']['cached']) && isset($results['ram']['buffers'])) {
        $results['ram']['app'] = $results['ram']['t_used'] - $results['ram']['cached'] - $results['ram']['buffers'];
 $results['ram']['app_percent'] = round(($results['ram']['app'] * 100) / $results['ram']['total']);
 $results['ram']['buffers_percent'] = round(($results['ram']['buffers'] * 100) / $results['ram']['total']);
 $results['ram']['cached_percent'] = round(($results['ram']['cached'] * 100) / $results['ram']['total']);
      }
      $swaps = file ('/proc/swaps');
      for ($i = 1; $i < (sizeof($swaps)); $i++) {
        $ar_buf = preg_split('/\s+/', $swaps[$i], 6);
        $results['devswap'][$i - 1] = array();
        $results['devswap'][$i - 1]['dev'] = $ar_buf[0];
        $results['devswap'][$i - 1]['total'] = $ar_buf[2];
        $results['devswap'][$i - 1]['used'] = $ar_buf[3];
        $results['devswap'][$i - 1]['free'] = ($results['devswap'][$i - 1]['total'] - $results['devswap'][$i - 1]['used']);
        $results['devswap'][$i - 1]['percent'] = round(($ar_buf[3] * 100) / $ar_buf[2]);
      } 
    } else {
      $results['ram'] = array();
      $results['swap'] = array();
      $results['devswap'] = array();
    }
    return $results;
  } 
?>

**GamingHybrid** · July 27th, 2007, 3:53 PM

You're my hero Cowboy! Thanks for this! I'll try it soon and see how it goes, also thanks for the information on about memory.

I'd click "thanks" if there the feature was still there... :P

July 26th, 2007, 2:59 AM	#1 (permalink)
GamingHybrid Bow before Surpass! Super #1 Joined in Sep 2004 1,542 posts Gave thanks: 91 Thanked 49 times	PHP Memory Checker I'm trying to do a "if" statement where the PHP checks on the server's memory usage and performs actions based on the amount. For example, if it could find the usage of memory in percentage values, then I'd have an if statement tha would... PHP Code: `if (memory => low) { /* show content / } elseif (memory => medium) { / show limited content / } elseif (memory =< high) { / block access / }` So, would anyone know the right type of method to find the memory usage and then create a similar if statement? Thank you __________________ Wii Hotspot - Upcoming project! -http://www.wiihotspot.com* Make a cPanel Login Form \| Why is my Account Suspended?

July 26th, 2007, 7:31 AM	#2 (permalink)
cowboy Surpass Fan Excelling Contributor Joined in Nov 2005 Lives in Colorado Hosted on DEDI 934 posts Gave thanks: 2 Thanked 94 times	Memory is physical and swap, so you need to determine the criteria you wish to compare when you indicate values like low, medium, high. I graph my server memory and keep my eye on a constant System, currently around 40%, and a very low swap file. If I were to use an if() statement to determine tasks I suppose I would use the swap file as the deciding factor: low < 5%; high > 70%. You will find memory usage in the file meminfo in the proc directory. Sample: Code: MemTotal: 451100 kB MemFree: 21956 kB Buffers: 76644 kB Cached: 170976 kB SwapCached: 19332 kB Active: 244424 kB Inactive: 127024 kB HighTotal: 0 kB HighFree: 0 kB LowTotal: 451100 kB LowFree: 21956 kB SwapTotal: 2048276 kB SwapFree: 1962216 kB Dirty: 1216 kB Writeback: 0 kB Mapped: 139048 kB Slab: 50756 kB Committed_AS: 443792 kB PageTables: 2240 kB VmallocTotal: 565240 kB VmallocUsed: 3644 kB VmallocChunk: 561348 kB HugePages_Total: 0 HugePages_Free: 0 Hugepagesize: 4096 kB and the size of the swap files in the file swaps in the proc directory. Sample: Code: Filename Type Size Used Priority /dev/hda3 partition 2048276 86060 -1 Filename Type Size Used Priority /dev/hda3 partition 2048276 86060 -1 Filename Type Size Used Priority /dev/hda3 partition 2048276 86060 -1 Filename Type Size Used Priority /dev/hda3 partition 2048276 86060 -1 Filename Type Size Used Priority /dev/hda3 partition 2048276 86060 -1 Sample Code function to yield Physical memory (System, Buffered, & Cached) and Swap (Total & Available): PHP Code: <? function memory () { if ($fd = fopen('/proc/meminfo', 'r')) { $results['ram'] = array(); $results['swap'] = array(); $results['devswap'] = array(); while ($buf = fgets($fd, 4096)) { if (preg_match('/^MemTotal:\s+(.)\skB/i', $buf, $ar_buf)) { $results['ram']['total'] = $ar_buf[1]; } else if (preg_match('/^MemFree:\s+(.)\skB/i', $buf, $ar_buf)) { $results['ram']['t_free'] = $ar_buf[1]; } else if (preg_match('/^Cached:\s+(.)\skB/i', $buf, $ar_buf)) { $results['ram']['cached'] = $ar_buf[1]; } else if (preg_match('/^Buffers:\s+(.)\skB/i', $buf, $ar_buf)) { $results['ram']['buffers'] = $ar_buf[1]; } else if (preg_match('/^SwapTotal:\s+(.)\skB/i', $buf, $ar_buf)) { $results['swap']['total'] = $ar_buf[1]; } else if (preg_match('/^SwapFree:\s+(.)\skB/i', $buf, $ar_buf)) { $results['swap']['free'] = $ar_buf[1]; } } fclose($fd); $results['ram']['t_used'] = $results['ram']['total'] - $results['ram']['t_free']; $results['ram']['percent'] = round(($results['ram']['t_used'] * 100) / $results['ram']['total']); $results['swap']['used'] = $results['swap']['total'] - $results['swap']['free']; $results['swap']['percent'] = round(($results['swap']['used'] * 100) / $results['swap']['total']); // values for splitting memory usage if (isset($results['ram']['cached']) && isset($results['ram']['buffers'])) { $results['ram']['app'] = $results['ram']['t_used'] - $results['ram']['cached'] - $results['ram']['buffers']; $results['ram']['app_percent'] = round(($results['ram']['app'] * 100) / $results['ram']['total']); $results['ram']['buffers_percent'] = round(($results['ram']['buffers'] * 100) / $results['ram']['total']); $results['ram']['cached_percent'] = round(($results['ram']['cached'] * 100) / $results['ram']['total']); } $swaps = file ('/proc/swaps'); for ($i = 1; $i < (sizeof($swaps)); $i++) { $ar_buf = preg_split('/\s+/', $swaps[$i], 6); $results['devswap'][$i - 1] = array(); $results['devswap'][$i - 1]['dev'] = $ar_buf[0]; $results['devswap'][$i - 1]['total'] = $ar_buf[2]; $results['devswap'][$i - 1]['used'] = $ar_buf[3]; $results['devswap'][$i - 1]['free'] = ($results['devswap'][$i - 1]['total'] - $results['devswap'][$i - 1]['used']); $results['devswap'][$i - 1]['percent'] = round(($ar_buf[3] * 100) / $ar_buf[2]); } } else { $results['ram'] = array(); $results['swap'] = array(); $results['devswap'] = array(); } return $results; } ?> __________________ Where would you be if you were at the highest court in the land (US)?

July 27th, 2007, 3:53 PM	#3 (permalink)
GamingHybrid Bow before Surpass! Super #1 Joined in Sep 2004 1,542 posts Gave thanks: 91 Thanked 49 times	You're my hero Cowboy! Thanks for this! I'll try it soon and see how it goes, also thanks for the information on about memory. I'd click "thanks" if there the feature was still there... :P __________________ Wii Hotspot - Upcoming project! -http://www.wiihotspot.com Make a cPanel Login Form \| Why is my Account Suspended?

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