Memory leak symfony and monolog and console

Question

I spent the last 2 hours trying to find my memory leak.

• Optimized the doctrine bulk processing
• Optimized my detach and all that doctrine annotation stuff
• Optimized the SQL Logger
• The script was still leaking
• Decided to comment out the logging because there wasn't much I could do anyway

Turns out that

• Over 40k iterations without logging at each n but at modulus 50, start mem: 28 mb end mem: 30mb
• Over 5k iterations with logging at each n, no modulus, start mem:28mb, end mem 38mb.

Example

 # this leaks
 # start mem: 28 mb end mem: 38mb, n = 5k
 foreach ($this->queryData->iterate() as $j => $data):
            declare(ticks = 1);
            self::$currentAd++;
            $this->em->detach($data[0]);
            $this->logger->info(LogUtility::getMemoryUsage() . " (" . self::$currentAd .")");
            if(self::$currentAd === 40000 ):
                break(2);
            endif;
  endforeach;

 # this doesn't leak
 # start mem: 28 mb end mem: 30mb, n = 40k
 foreach ($this->queryData->iterate() as $j => $data):
            declare(ticks = 1);
            self::$currentAd++;
            $this->em->detach($data[0]);
            if(self::$currentAd % 50 == 0):
                  $this->logger->info(LogUtility::getMemoryUsage() . " (" . self::$currentAd .")");
            endif;
            if(self::$currentAd === 40000 ):
                break(2);
            endif;
  endforeach;

my monolog config:

 handlers:
    test:
        type:   stream
        path:   "%kernel.logs_dir%/immobilier/test.log"
        level:  debug
        channels: test
  console:
        type:   console
        bubble: false
        verbosity_levels:
            VERBOSITY_VERBOSE: INFO
            VERBOSITY_VERY_VERBOSE: DEBUG
        channels: [test]

Any suggestions to correct this ?

Answer 1

Found the solution. I can't tell you the exact reasons why such memory leak happen, however according to this; Adding the --no-debug option to your command solves the problem. It actually did and it even reduced the memory by 2mb. Cheers !