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HHVM Cyclical Garbage Collecting is broken #7345

Open RyanGordon opened 8 years ago

RyanGordon commented 8 years ago

HHVM Version

hhvm --version
HipHop VM 3.14.5 (rel)
Compiler: tags/HHVM-3.14.5-0-gc6bf714e6468213eed377527b431e9cd4cec1432
Repo schema: 9ab3fe4281c731189b558d921eb7317b0eb2b2e6
php --version
PHP 5.5.32 (cli) (built: Feb  4 2016 23:20:47) 
Copyright (c) 1997-2015 The PHP Group
Zend Engine v2.5.0, Copyright (c) 1998-2015 Zend Technologies
    with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2015, by Zend Technologies

Standalone code, or other way to reproduce the problem

Two test scripts:

# cyclical_test.php
<?php

ini_set('memory_limit', '10G');

class Left {
   public $right;
}

class Right {
   public $left;
}

$iter = 0;
while (true) {
   $left = new Left();
   $right = new Right();
   $left->right = $right;
   $right->left = $left;
   $iter++;
   if ($iter % 1000000 === 0) {
      $formattedIter = number_format($iter, 0);
      $memoryUsage = memory_get_usage() / (1024 * 1024);
      echo "Survived {$formattedIter} iterations: {$memoryUsage}MB used\n";
   }
}

?>
# non_cyclical_test.php
<?php

ini_set('memory_limit', '10G');

class One {
   public $one = 1;
}

$iter = 0;
while (true) {
   $one = new One();
   $iter++;
   if ($iter % 1000000 === 0) {
      $formattedIter = number_format($iter, 0);
      $memoryUsage = memory_get_usage() / (1024 * 1024);
      echo "Survived {$formattedIter} iterations: {$memoryUsage}MB used\n";
   }
}

?>

Expected result

We expect memory usage to stay low and not explode:

$ /usr/bin/php cyclical_test.php
Survived 1,000,000 iterations: 1.1863784790039MB used
Survived 2,000,000 iterations: 1.2109756469727MB used
Survived 3,000,000 iterations: 1.2353897094727MB used
Survived 4,000,000 iterations: 1.2598037719727MB used
Survived 5,000,000 iterations: 1.2842178344727MB used
Survived 6,000,000 iterations: 1.3086318969727MB used
Survived 7,000,000 iterations: 1.3330459594727MB used
Survived 8,000,000 iterations: 1.3574752807617MB used
Survived 9,000,000 iterations: 1.3818740844727MB used
Survived 10,000,000 iterations: 1.4062881469727MB used
Survived 11,000,000 iterations: 1.4307022094727MB used
Survived 12,000,000 iterations: 1.4551467895508MB used
Survived 13,000,000 iterations: 1.4796981811523MB used
Survived 14,000,000 iterations: 1.5053634643555MB used
Survived 15,000,000 iterations: 1.5302047729492MB used
Survived 16,000,000 iterations: 1.5549240112305MB used
Survived 17,000,000 iterations: 1.5798873901367MB used
Survived 18,000,000 iterations: 1.6045608520508MB used
Survived 19,000,000 iterations: 1.6292953491211MB used
Survived 20,000,000 iterations: 1.653923034668MB used
Survived 21,000,000 iterations: 1.6791610717773MB used
Survived 22,000,000 iterations: 1.7042007446289MB used
Survived 23,000,000 iterations: 1.7290725708008MB used
Survived 24,000,000 iterations: 1.7536544799805MB used
Survived 25,000,000 iterations: 1.7786636352539MB used
Survived 26,000,000 iterations: 1.8034439086914MB used
Survived 27,000,000 iterations: 1.8284072875977MB used
Survived 28,000,000 iterations: 1.8535232543945MB used
Survived 29,000,000 iterations: 1.8784408569336MB used
Survived 30,000,000 iterations: 1.9027481079102MB used
Survived 31,000,000 iterations: 1.927360534668MB used
Survived 32,000,000 iterations: 1.9524154663086MB used
Survived 33,000,000 iterations: 1.9762802124023MB used
Survived 34,000,000 iterations: 2.0016708374023MB used
Survived 35,000,000 iterations: 2.025749206543MB used
Survived 36,000,000 iterations: 2.0504379272461MB used
Survived 37,000,000 iterations: 2.0751419067383MB used
Survived 38,000,000 iterations: 2.0998764038086MB used
Survived 39,000,000 iterations: 2.1247634887695MB used
Survived 40,000,000 iterations: 2.1489181518555MB used
Survived 41,000,000 iterations: 2.1744918823242MB used
Survived 42,000,000 iterations: 2.199333190918MB used
Survived 43,000,000 iterations: 2.2241287231445MB used
Survived 44,000,000 iterations: 2.2484664916992MB used
Survived 45,000,000 iterations: 2.2726669311523MB used
Survived 46,000,000 iterations: 2.297233581543MB used
Survived 47,000,000 iterations: 2.322151184082MB used
Survived 48,000,000 iterations: 2.346565246582MB used
Survived 49,000,000 iterations: 2.3715744018555MB used
Survived 50,000,000 iterations: 1.1623916625977MB used
Survived 51,000,000 iterations: 1.1868057250977MB used
Survived 52,000,000 iterations: 1.2114181518555MB used
Survived 53,000,000 iterations: 1.2367172241211MB used
Survived 54,000,000 iterations: 1.2617568969727MB used
Survived 55,000,000 iterations: 1.286491394043MB used
Survived 56,000,000 iterations: 1.3120040893555MB used
Survived 57,000,000 iterations: 1.3371047973633MB used
Survived 58,000,000 iterations: 1.3626480102539MB used
Survived 59,000,000 iterations: 1.3877182006836MB used
Survived 60,000,000 iterations: 1.4123916625977MB used
Survived 61,000,000 iterations: 1.4376449584961MB used
Survived 62,000,000 iterations: 1.4625015258789MB used
Survived 63,000,000 iterations: 1.4873580932617MB used
Survived 64,000,000 iterations: 1.5118179321289MB used
Survived 65,000,000 iterations: 1.5366897583008MB used
Survived 66,000,000 iterations: 1.5615768432617MB used
Survived 67,000,000 iterations: 1.5861434936523MB used
Survived 68,000,000 iterations: 1.6105117797852MB used
Survived 69,000,000 iterations: 1.6356430053711MB used
Survived 70,000,000 iterations: 1.6600570678711MB used
Survived 71,000,000 iterations: 1.6847763061523MB used
^C
$ qhhvm non_cyclical_test.php
Survived 1,000,000 iterations: 2MB used
Survived 2,000,000 iterations: 2MB used
Survived 3,000,000 iterations: 2MB used
Survived 4,000,000 iterations: 2MB used
Survived 5,000,000 iterations: 2MB used
Survived 6,000,000 iterations: 2MB used
Survived 7,000,000 iterations: 2MB used
Survived 8,000,000 iterations: 2MB used
Survived 9,000,000 iterations: 2MB used
Survived 10,000,000 iterations: 2MB used
Survived 11,000,000 iterations: 2MB used
Survived 12,000,000 iterations: 2MB used
Survived 13,000,000 iterations: 2MB used
Survived 14,000,000 iterations: 2MB used
Survived 15,000,000 iterations: 2MB used
Survived 16,000,000 iterations: 2MB used
Survived 17,000,000 iterations: 2MB used
Survived 18,000,000 iterations: 2MB used
Survived 19,000,000 iterations: 2MB used
Survived 20,000,000 iterations: 2MB used
Survived 21,000,000 iterations: 2MB used
Survived 22,000,000 iterations: 2MB used
Survived 23,000,000 iterations: 2MB used
Survived 24,000,000 iterations: 2MB used
Survived 25,000,000 iterations: 2MB used
Survived 26,000,000 iterations: 2MB used
Survived 27,000,000 iterations: 2MB used
Survived 28,000,000 iterations: 2MB used
Survived 29,000,000 iterations: 2MB used
Survived 30,000,000 iterations: 2MB used
Survived 31,000,000 iterations: 2MB used
Survived 32,000,000 iterations: 2MB used
Survived 33,000,000 iterations: 2MB used
Survived 34,000,000 iterations: 2MB used
Survived 35,000,000 iterations: 2MB used
Survived 36,000,000 iterations: 2MB used
Survived 37,000,000 iterations: 2MB used
Survived 38,000,000 iterations: 2MB used
Survived 39,000,000 iterations: 2MB used
Survived 40,000,000 iterations: 2MB used
Survived 41,000,000 iterations: 2MB used
Survived 42,000,000 iterations: 2MB used
Survived 43,000,000 iterations: 2MB used
Survived 44,000,000 iterations: 2MB used
Survived 45,000,000 iterations: 2MB used
Survived 46,000,000 iterations: 2MB used
Survived 47,000,000 iterations: 2MB used
Survived 48,000,000 iterations: 2MB used
Survived 49,000,000 iterations: 2MB used
Survived 50,000,000 iterations: 2MB used
Survived 51,000,000 iterations: 2MB used
Survived 52,000,000 iterations: 2MB used
Survived 53,000,000 iterations: 2MB used
Survived 54,000,000 iterations: 2MB used
Survived 55,000,000 iterations: 2MB used
Survived 56,000,000 iterations: 2MB used
Survived 57,000,000 iterations: 2MB used
Survived 58,000,000 iterations: 2MB used
Survived 59,000,000 iterations: 2MB used
Survived 60,000,000 iterations: 2MB used
Survived 61,000,000 iterations: 2MB used
Survived 62,000,000 iterations: 2MB used
Survived 63,000,000 iterations: 2MB used
Survived 64,000,000 iterations: 2MB used
Survived 65,000,000 iterations: 2MB used
Survived 66,000,000 iterations: 2MB used
Survived 67,000,000 iterations: 2MB used
Survived 68,000,000 iterations: 2MB used
Survived 69,000,000 iterations: 2MB used
Survived 70,000,000 iterations: 2MB used
Survived 71,000,000 iterations: 2MB used
Survived 72,000,000 iterations: 2MB used
Survived 73,000,000 iterations: 2MB used
Survived 74,000,000 iterations: 2MB used
Survived 75,000,000 iterations: 2MB used
Survived 76,000,000 iterations: 2MB used
Survived 77,000,000 iterations: 2MB used
Survived 78,000,000 iterations: 2MB used
Survived 79,000,000 iterations: 2MB used
Survived 80,000,000 iterations: 2MB used
Survived 81,000,000 iterations: 2MB used
Survived 82,000,000 iterations: 2MB used
Survived 83,000,000 iterations: 2MB used
Survived 84,000,000 iterations: 2MB used
Survived 85,000,000 iterations: 2MB used
Survived 86,000,000 iterations: 2MB used
Survived 87,000,000 iterations: 2MB used
Survived 88,000,000 iterations: 2MB used
Survived 89,000,000 iterations: 2MB used
Survived 90,000,000 iterations: 2MB used
Survived 91,000,000 iterations: 2MB used
Survived 92,000,000 iterations: 2MB used
Survived 93,000,000 iterations: 2MB used
Survived 94,000,000 iterations: 2MB used
Survived 95,000,000 iterations: 2MB used
^C
$ /usr/bin/php non_cyclical_test.php
Survived 1,000,000 iterations: 0.22219848632812MB used
Survived 2,000,000 iterations: 0.22237396240234MB used
Survived 3,000,000 iterations: 0.22237396240234MB used
Survived 4,000,000 iterations: 0.22237396240234MB used
Survived 5,000,000 iterations: 0.22237396240234MB used
Survived 6,000,000 iterations: 0.22237396240234MB used
Survived 7,000,000 iterations: 0.22237396240234MB used
Survived 8,000,000 iterations: 0.22237396240234MB used
Survived 9,000,000 iterations: 0.22237396240234MB used
Survived 10,000,000 iterations: 0.22237396240234MB used
Survived 11,000,000 iterations: 0.22237396240234MB used
Survived 12,000,000 iterations: 0.22237396240234MB used
Survived 13,000,000 iterations: 0.22237396240234MB used
Survived 14,000,000 iterations: 0.22237396240234MB used
Survived 15,000,000 iterations: 0.22237396240234MB used
Survived 16,000,000 iterations: 0.22237396240234MB used
Survived 17,000,000 iterations: 0.22237396240234MB used
Survived 18,000,000 iterations: 0.22237396240234MB used
Survived 19,000,000 iterations: 0.22237396240234MB used
Survived 20,000,000 iterations: 0.22237396240234MB used
Survived 21,000,000 iterations: 0.22237396240234MB used
Survived 22,000,000 iterations: 0.22237396240234MB used
Survived 23,000,000 iterations: 0.22237396240234MB used
Survived 24,000,000 iterations: 0.22237396240234MB used
Survived 25,000,000 iterations: 0.22237396240234MB used
Survived 26,000,000 iterations: 0.22237396240234MB used
Survived 27,000,000 iterations: 0.22237396240234MB used
Survived 28,000,000 iterations: 0.22237396240234MB used
Survived 29,000,000 iterations: 0.22237396240234MB used
Survived 30,000,000 iterations: 0.22237396240234MB used
Survived 31,000,000 iterations: 0.22237396240234MB used
Survived 32,000,000 iterations: 0.22237396240234MB used
Survived 33,000,000 iterations: 0.22237396240234MB used
Survived 34,000,000 iterations: 0.22237396240234MB used
Survived 35,000,000 iterations: 0.22237396240234MB used
Survived 36,000,000 iterations: 0.22237396240234MB used
Survived 37,000,000 iterations: 0.22237396240234MB used
Survived 38,000,000 iterations: 0.22237396240234MB used
Survived 39,000,000 iterations: 0.22237396240234MB used
Survived 40,000,000 iterations: 0.22237396240234MB used
Survived 41,000,000 iterations: 0.22237396240234MB used
Survived 42,000,000 iterations: 0.22237396240234MB used
Survived 43,000,000 iterations: 0.22237396240234MB used
Survived 44,000,000 iterations: 0.22237396240234MB used
Survived 45,000,000 iterations: 0.22237396240234MB used
Survived 46,000,000 iterations: 0.22237396240234MB used
Survived 47,000,000 iterations: 0.22237396240234MB used
Survived 48,000,000 iterations: 0.22237396240234MB used
Survived 49,000,000 iterations: 0.22237396240234MB used
Survived 50,000,000 iterations: 0.22237396240234MB used
Survived 51,000,000 iterations: 0.22237396240234MB used
Survived 52,000,000 iterations: 0.22237396240234MB used
Survived 53,000,000 iterations: 0.22237396240234MB used
Survived 54,000,000 iterations: 0.22237396240234MB used
Survived 55,000,000 iterations: 0.22237396240234MB used
Survived 56,000,000 iterations: 0.22237396240234MB used
Survived 57,000,000 iterations: 0.22237396240234MB used
Survived 58,000,000 iterations: 0.22237396240234MB used
Survived 59,000,000 iterations: 0.22237396240234MB used
Survived 60,000,000 iterations: 0.22237396240234MB used
Survived 61,000,000 iterations: 0.22237396240234MB used
Survived 62,000,000 iterations: 0.22237396240234MB used
Survived 63,000,000 iterations: 0.22237396240234MB used
Survived 64,000,000 iterations: 0.22237396240234MB used
Survived 65,000,000 iterations: 0.22237396240234MB used
Survived 66,000,000 iterations: 0.22237396240234MB used
Survived 67,000,000 iterations: 0.22237396240234MB used
Survived 68,000,000 iterations: 0.22237396240234MB used
Survived 69,000,000 iterations: 0.22237396240234MB used
Survived 70,000,000 iterations: 0.22237396240234MB used
Survived 71,000,000 iterations: 0.22237396240234MB used
Survived 72,000,000 iterations: 0.22237396240234MB used
Survived 73,000,000 iterations: 0.22237396240234MB used
Survived 74,000,000 iterations: 0.22237396240234MB used
Survived 75,000,000 iterations: 0.22237396240234MB used
Survived 76,000,000 iterations: 0.22237396240234MB used
Survived 77,000,000 iterations: 0.22237396240234MB used
Survived 78,000,000 iterations: 0.22237396240234MB used
Survived 79,000,000 iterations: 0.22237396240234MB used
Survived 80,000,000 iterations: 0.22237396240234MB used
Survived 81,000,000 iterations: 0.22237396240234MB used
Survived 82,000,000 iterations: 0.22237396240234MB used
Survived 83,000,000 iterations: 0.22237396240234MB used
Survived 84,000,000 iterations: 0.22237396240234MB used
Survived 85,000,000 iterations: 0.22237396240234MB used
Survived 86,000,000 iterations: 0.22237396240234MB used
Survived 87,000,000 iterations: 0.22237396240234MB used
Survived 88,000,000 iterations: 0.22237396240234MB used
Survived 89,000,000 iterations: 0.22237396240234MB used
Survived 90,000,000 iterations: 0.22237396240234MB used
Survived 91,000,000 iterations: 0.22237396240234MB used
Survived 92,000,000 iterations: 0.22237396240234MB used
Survived 93,000,000 iterations: 0.22237396240234MB used
Survived 94,000,000 iterations: 0.22237396240234MB used
Survived 95,000,000 iterations: 0.22237396240234MB used
Survived 96,000,000 iterations: 0.22237396240234MB used
Survived 97,000,000 iterations: 0.22237396240234MB used
^C

Actual result

What we actually see is that memory usage continuously increases under HHVM, until the kernel kills the process:

$ qhhvm cyclical_test.php
Survived 1,000,000 iterations: 92MB used
Survived 2,000,000 iterations: 184MB used
Survived 3,000,000 iterations: 276MB used
Survived 4,000,000 iterations: 368MB used
Survived 5,000,000 iterations: 460MB used
Survived 6,000,000 iterations: 550MB used
Survived 7,000,000 iterations: 642MB used
Survived 8,000,000 iterations: 734MB used
Survived 9,000,000 iterations: 826MB used
Survived 10,000,000 iterations: 916MB used
Survived 11,000,000 iterations: 1008MB used
Survived 12,000,000 iterations: 1100MB used
Survived 13,000,000 iterations: 1192MB used
Survived 14,000,000 iterations: 1284MB used
Survived 15,000,000 iterations: 1374MB used
Survived 16,000,000 iterations: 1466MB used
Survived 17,000,000 iterations: 1558MB used
Survived 18,000,000 iterations: 1650MB used
Survived 19,000,000 iterations: 1740MB used
Survived 20,000,000 iterations: 1832MB used
Survived 21,000,000 iterations: 1924MB used
Survived 22,000,000 iterations: 2016MB used
Survived 23,000,000 iterations: 2108MB used
Survived 24,000,000 iterations: 2198MB used
Survived 25,000,000 iterations: 2290MB used
Survived 26,000,000 iterations: 2382MB used
Survived 27,000,000 iterations: 2474MB used
Survived 28,000,000 iterations: 2564MB used
Survived 29,000,000 iterations: 2656MB used
Survived 30,000,000 iterations: 2748MB used
Survived 31,000,000 iterations: 2840MB used
Survived 32,000,000 iterations: 2932MB used
Survived 33,000,000 iterations: 3022MB used
Survived 34,000,000 iterations: 3114MB used
Survived 35,000,000 iterations: 3206MB used
Survived 36,000,000 iterations: 3298MB used
Survived 37,000,000 iterations: 3388MB used
Survived 38,000,000 iterations: 3480MB used
Survived 39,000,000 iterations: 3572MB used
Survived 40,000,000 iterations: 3664MB used
Survived 41,000,000 iterations: 3756MB used
Survived 42,000,000 iterations: 3846MB used
Survived 43,000,000 iterations: 3938MB used
Survived 44,000,000 iterations: 4030MB used
Survived 45,000,000 iterations: 4122MB used
Survived 46,000,000 iterations: 4212MB used
Killed

Even with the (undocumented) garbage collector turned on, it still explodes

$ qhhvm -vEval.EnableGC=1 cyclical_test.php
Survived 1,000,000 iterations: 92MB used
Survived 2,000,000 iterations: 184MB used
Survived 3,000,000 iterations: 276MB used
Survived 4,000,000 iterations: 368MB used
Survived 5,000,000 iterations: 460MB used
Survived 6,000,000 iterations: 550MB used
Survived 7,000,000 iterations: 642MB used
Survived 8,000,000 iterations: 734MB used
Survived 9,000,000 iterations: 826MB used
Survived 10,000,000 iterations: 916MB used
Survived 11,000,000 iterations: 1008MB used
Survived 12,000,000 iterations: 1100MB used
Survived 13,000,000 iterations: 1192MB used
Survived 14,000,000 iterations: 1284MB used
Survived 15,000,000 iterations: 1374MB used
Survived 16,000,000 iterations: 1466MB used
Survived 17,000,000 iterations: 1558MB used
Survived 18,000,000 iterations: 1650MB used
Survived 19,000,000 iterations: 1740MB used
Survived 20,000,000 iterations: 1832MB used
Survived 21,000,000 iterations: 1924MB used
Survived 22,000,000 iterations: 2016MB used
Survived 23,000,000 iterations: 2108MB used
Survived 24,000,000 iterations: 2198MB used
Survived 25,000,000 iterations: 2290MB used
Survived 26,000,000 iterations: 2382MB used
Survived 27,000,000 iterations: 2474MB used
Survived 28,000,000 iterations: 2564MB used
Survived 29,000,000 iterations: 2656MB used
Survived 30,000,000 iterations: 2748MB used
Survived 31,000,000 iterations: 2840MB used
Survived 32,000,000 iterations: 2932MB used
Survived 33,000,000 iterations: 3022MB used
Survived 34,000,000 iterations: 3114MB used
Survived 35,000,000 iterations: 3206MB used
Survived 36,000,000 iterations: 3298MB used
Survived 37,000,000 iterations: 3388MB used
Survived 38,000,000 iterations: 3480MB used
Survived 39,000,000 iterations: 3572MB used
Survived 40,000,000 iterations: 3664MB used
Survived 41,000,000 iterations: 3756MB used
Survived 42,000,000 iterations: 3846MB used
Killed
Orvid commented 8 years ago

I don't believe 3.14 had full GC support, could you try this on 3.15?

edwinsmith commented 8 years ago

just to verify, your last try was with -vEval.EnableGC=1, correct?

RyanGordon commented 8 years ago

@edwinsmith Yes, our last try was with -vEval.EnableGC=1 @Orvid I will recompile with 3.15 and try it again and post the results here!

edwinsmith commented 8 years ago

Oh, also, the current GC scheduling heuristic is based on a fraction of the heap limit, which makes sense for production scenarios with small heap limits, but nowhere else. You have it set to 10G, and the linux kernel kills the hhvm process around 4G. Try setting the heap limit to something smaller?

RyanGordon commented 8 years ago

Should I do that on 3.15 or 3.14.5 or it doesn't matter?

edwinsmith commented 8 years ago

I'd say 3.15 or master; the heuristic hasn't changed in a couple weeks but not sure how old 3.14 is, like @Orvid said.

RyanGordon commented 8 years ago

Here is the updated results.

hhvm --version
HipHop VM 3.15.0 (rel)
Compiler: tags/HHVM-3.15.0-0-g92a682ebaa3c85b84857852d8621f528607fe27d
Repo schema: 225d4323575bbc8a498dc809a1c41354f6bca830

Updated cyclical_test.php script:

<?php

ini_set('memory_limit', '512M');

class Left {
   public $right;
}

class Right {
   public $left;
}

$iter = 0;
while (true) {
   $left = new Left();
   $right = new Right();
   $left->right = $right;
   $right->left = $left;
   $iter++;
   if ($iter % 1000000 === 0) {
      $formattedIter = number_format($iter, 0);
      $memoryUsage = memory_get_usage() / (1024 * 1024);
      echo "Survived {$formattedIter} iterations: {$memoryUsage}MB used\n";
   }
}

?>

First Test w/o GC:

qhhvm cyclical_test.php 
Survived 1,000,000 iterations: 92MB used
Survived 2,000,000 iterations: 184MB used
Survived 3,000,000 iterations: 276MB used
Survived 4,000,000 iterations: 368MB used
Survived 5,000,000 iterations: 460MB used
Survived 6,000,000 iterations: 550MB used
Fatal error: request has exceeded memory limit in /home/ryangordon/cyclical_test.php on line 11

Second Test With GC:

$ qhhvm -vEval.EnableGC=1 cyclical_test.php 
Survived 1,000,000 iterations: 92MB used
Survived 2,000,000 iterations: 184MB used
Survived 3,000,000 iterations: 276MB used
Survived 4,000,000 iterations: 290MB used
Survived 5,000,000 iterations: 290MB used
Survived 6,000,000 iterations: 290MB used
Survived 7,000,000 iterations: 300MB used
Survived 8,000,000 iterations: 300MB used
Survived 9,000,000 iterations: 300MB used
Survived 10,000,000 iterations: 302MB used
Survived 11,000,000 iterations: 302MB used
Survived 12,000,000 iterations: 302MB used
Survived 13,000,000 iterations: 304MB used
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Survived 20,000,000 iterations: 308MB used
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Survived 27,000,000 iterations: 312MB used
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Survived 30,000,000 iterations: 314MB used
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Survived 34,000,000 iterations: 316MB used
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Survived 37,000,000 iterations: 318MB used
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Survived 41,000,000 iterations: 320MB used
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Survived 48,000,000 iterations: 324MB used
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Survived 55,000,000 iterations: 328MB used
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Survived 58,000,000 iterations: 330MB used
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Survived 69,000,000 iterations: 336MB used
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Survived 73,000,000 iterations: 338MB used
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Survived 77,000,000 iterations: 340MB used
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Survived 80,000,000 iterations: 342MB used
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Survived 84,000,000 iterations: 344MB used
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Survived 88,000,000 iterations: 346MB used
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Survived 91,000,000 iterations: 348MB used
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Survived 106,000,000 iterations: 354MB used
Survived 107,000,000 iterations: 356MB used
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Survived 111,000,000 iterations: 358MB used
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Survived 119,000,000 iterations: 362MB used
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Survived 122,000,000 iterations: 364MB used
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Survived 125,000,000 iterations: 364MB used
Survived 126,000,000 iterations: 366MB used
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Survived 130,000,000 iterations: 368MB used
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Survived 134,000,000 iterations: 370MB used
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Survived 139,000,000 iterations: 372MB used
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Survived 143,000,000 iterations: 374MB used
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Survived 172,000,000 iterations: 388MB used
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Survived 176,000,000 iterations: 390MB used
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Survived 180,000,000 iterations: 392MB used
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Survived 363,000,000 iterations: 470MB used
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Survived 368,000,000 iterations: 472MB used
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Survived 373,000,000 iterations: 474MB used
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Survived 384,000,000 iterations: 478MB used
Survived 385,000,000 iterations: 478MB used
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Survived 388,000,000 iterations: 478MB used
Survived 389,000,000 iterations: 480MB used
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Survived 400,000,000 iterations: 484MB used
Survived 401,000,000 iterations: 484MB used
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Survived 405,000,000 iterations: 486MB used
Survived 406,000,000 iterations: 486MB used
Survived 407,000,000 iterations: 486MB used
Survived 408,000,000 iterations: 486MB used
Survived 409,000,000 iterations: 486MB used
Survived 410,000,000 iterations: 488MB used
Survived 411,000,000 iterations: 488MB used
Survived 412,000,000 iterations: 488MB used
Survived 413,000,000 iterations: 488MB used
Survived 414,000,000 iterations: 488MB used
Survived 415,000,000 iterations: 490MB used
Survived 416,000,000 iterations: 490MB used
Survived 417,000,000 iterations: 490MB used
Survived 418,000,000 iterations: 490MB used
Survived 419,000,000 iterations: 490MB used
Survived 420,000,000 iterations: 490MB used
Survived 421,000,000 iterations: 492MB used
Survived 422,000,000 iterations: 492MB used
Survived 423,000,000 iterations: 492MB used
Survived 424,000,000 iterations: 492MB used
Survived 425,000,000 iterations: 492MB used
Survived 426,000,000 iterations: 494MB used
Survived 427,000,000 iterations: 494MB used
Survived 428,000,000 iterations: 494MB used
Survived 429,000,000 iterations: 494MB used
Survived 430,000,000 iterations: 494MB used
Survived 431,000,000 iterations: 494MB used
Survived 432,000,000 iterations: 496MB used
Survived 433,000,000 iterations: 496MB used
Survived 434,000,000 iterations: 496MB used
Survived 435,000,000 iterations: 496MB used
Survived 436,000,000 iterations: 496MB used
Survived 437,000,000 iterations: 498MB used
Survived 438,000,000 iterations: 498MB used
Survived 439,000,000 iterations: 498MB used
Survived 440,000,000 iterations: 498MB used
Survived 441,000,000 iterations: 498MB used
Survived 442,000,000 iterations: 500MB used
Survived 443,000,000 iterations: 500MB used
Survived 444,000,000 iterations: 500MB used
Survived 445,000,000 iterations: 500MB used
Survived 446,000,000 iterations: 500MB used
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Survived 449,000,000 iterations: 502MB used
Survived 450,000,000 iterations: 502MB used
Survived 451,000,000 iterations: 502MB used
Survived 452,000,000 iterations: 502MB used
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Survived 454,000,000 iterations: 504MB used
Survived 455,000,000 iterations: 504MB used
Survived 456,000,000 iterations: 504MB used
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Survived 460,000,000 iterations: 506MB used
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Survived 462,000,000 iterations: 506MB used
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Survived 465,000,000 iterations: 508MB used
Survived 466,000,000 iterations: 508MB used
Survived 467,000,000 iterations: 508MB used
Survived 468,000,000 iterations: 508MB used
Survived 469,000,000 iterations: 508MB used
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Survived 472,000,000 iterations: 510MB used
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Survived 476,000,000 iterations: 512MB used
Survived 477,000,000 iterations: 512MB used
Survived 478,000,000 iterations: 512MB used
Survived 479,000,000 iterations: 512MB used
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Survived 485,000,000 iterations: 514MB used
Survived 486,000,000 iterations: 514MB used
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Survived 488,000,000 iterations: 516MB used
Survived 489,000,000 iterations: 516MB used
Survived 490,000,000 iterations: 516MB used
Survived 491,000,000 iterations: 516MB used
Survived 492,000,000 iterations: 518MB used
Survived 493,000,000 iterations: 518MB used
Survived 494,000,000 iterations: 518MB used
Survived 495,000,000 iterations: 518MB used
Survived 496,000,000 iterations: 518MB used
Survived 497,000,000 iterations: 518MB used
Survived 498,000,000 iterations: 520MB used
Survived 499,000,000 iterations: 520MB used
Survived 500,000,000 iterations: 520MB used
Survived 501,000,000 iterations: 520MB used
Survived 502,000,000 iterations: 520MB used
Survived 503,000,000 iterations: 520MB used
Survived 504,000,000 iterations: 522MB used
Survived 505,000,000 iterations: 522MB used
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Survived 507,000,000 iterations: 522MB used
Survived 508,000,000 iterations: 522MB used
Survived 509,000,000 iterations: 524MB used
Survived 510,000,000 iterations: 524MB used
Survived 511,000,000 iterations: 524MB used
Survived 512,000,000 iterations: 524MB used
Survived 513,000,000 iterations: 524MB used
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Survived 516,000,000 iterations: 526MB used
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Survived 518,000,000 iterations: 526MB used
Survived 519,000,000 iterations: 526MB used
Survived 520,000,000 iterations: 526MB used
Survived 521,000,000 iterations: 528MB used
Survived 522,000,000 iterations: 528MB used
Survived 523,000,000 iterations: 528MB used
Survived 524,000,000 iterations: 528MB used
Survived 525,000,000 iterations: 528MB used
Survived 526,000,000 iterations: 528MB used
Survived 527,000,000 iterations: 530MB used
Survived 528,000,000 iterations: 530MB used
Survived 529,000,000 iterations: 530MB used
Survived 530,000,000 iterations: 530MB used
Survived 531,000,000 iterations: 530MB used
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Survived 533,000,000 iterations: 532MB used
Survived 534,000,000 iterations: 532MB used
Survived 535,000,000 iterations: 532MB used
Survived 536,000,000 iterations: 532MB used
Survived 537,000,000 iterations: 532MB used
Survived 538,000,000 iterations: 534MB used
Survived 539,000,000 iterations: 534MB used
Survived 540,000,000 iterations: 534MB used
Survived 541,000,000 iterations: 534MB used
Survived 542,000,000 iterations: 534MB used
Survived 543,000,000 iterations: 534MB used
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Survived 545,000,000 iterations: 536MB used
Survived 546,000,000 iterations: 536MB used
Survived 547,000,000 iterations: 536MB used
Survived 548,000,000 iterations: 536MB used
Survived 549,000,000 iterations: 536MB used
Survived 550,000,000 iterations: 538MB used
Survived 551,000,000 iterations: 538MB used
Survived 552,000,000 iterations: 538MB used
Survived 553,000,000 iterations: 538MB used
Survived 554,000,000 iterations: 538MB used
Survived 555,000,000 iterations: 538MB used
Survived 556,000,000 iterations: 540MB used
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Fatal error: request has exceeded memory limit in /home/ryangordon/cyclical_test.php on line 7

It lasts much longer but it still leaks memory even with the GC turned on and goes over the memory limit specified until it eventually errors out.

I also ran these two tests on 3.14.5 with the same results.

aorenste commented 8 years ago

I'm seeing this same behavior on master

edwinsmith commented 8 years ago

I'll take a look at this, tho I might not have much to report until next week. @aorenste if you peek in scuba you should see collection stats from your test runs.

firodj commented 8 years ago

what is qhhvm? but that was for long running script on CLI? how about the script when running on server, it is same or not?

firodj commented 8 years ago

what is qhhvm? but that was for long running script on CLI? how about the script when running on server, it is same or not?

RyanGordon commented 8 years ago

Sorry qhhvm is an alias for 

# qhhvm
export LD_LIBRARY_PATH=/opt/pcrelib
exec /usr/local/bin/hhvm $@

I haven't tested this through the server, just the CLI, since it is a long running script.

lexidor commented 1 year ago

I swooped in to close this issue, as this looked like a JIT profiling data[^1] related thing, rather than a GC thing. This is ptofiling data is especially big on the first request. Since you invoked hhvm from the CLI, this was "the first request".

I have ran this repro in server mode, both repo auth and plain jit. I waited for the profiling data to be put on the treadmill and PGO to kick in. All roads lead to an OOM. I can't get past 33,000,000 iterations before hitting an OOM at 2GB. Hhvm has regressed since the 3.15.x days.

Tested on hhvm 4.168.

[^1]: hhvm collects information on branches, types and a whole lot more. This profiling can take more memory than your actual program.