Edit report at https://bugs.php.net/bug.php?id=78076&edit=1
ID: 78076
Updated by: cmb@php.net
Reported by: tyler dot bannister at remote-learner dot net
Summary: Opcache greatly increases memory usage.
-Status: Open
+Status: Verified
Type: Bug
Package: opcache
Operating System: Centos 7.4.1708
PHP Version: 7.2.18
Block user comment: N
Private report: N
New Comment:
I can confirm the reported behavior (PHP 7.3 and 7.4 on Windows 10).
Previous Comments:
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[2019-05-28 16:06:47] tyler dot bannister at remote-learner dot net
I've continued testing the problem, and on the command line I was able to stop the memory
explosion in my test script by setting opcache.file_cache_only=0.
However, I only enabled that setting in the first place to deal with the problem of running out of
memory with the Moodle installer. So the issue isn't exclusive to having file_cache_only
enabled, but maybe that setting makes the problem worse?
The minimal number of non-default settings to replicate (on my now Centos 7.6.1810 with PHP 7.3.5
system) seems to be:
opcache.enable=1
opcache.enable_cli=1
opcache.file_cache="/var/lib/php/cli-opcache"
opcache.file_cache_only=1
I was also able to replicate the problem on Ubuntu 18.04.2 with PHP 7.2.17:
Opcache enabled with opcache.file_cache_only enabled:
Starting Memory:389008
Ending Memory:7860232
Opcache enabled with opcache.file_cache_only disabled:
Starting Memory:388432
Ending Memory:388432
Opcache disabled:
Starting Memory:389992
Ending Memory:390144
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[2019-05-28 15:43:12] tyler dot bannister at remote-learner dot net
PHP 7.28 actual output:
Opcache enabled:
Starting Memory:385248
Ending Memory:7856480
Opcache disabled:
Starting Memory:386104
Ending Memory:386232
PHP 7.3.5 actual output:
Opcache enabled:
Starting Memory:389112
Ending Memory:8450224
Opcache disabled:
Starting Memory:389904
Ending Memory:390088
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[2019-05-28 15:13:54] cmb@php.net
Thanks!
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[2019-05-28 15:09:32] tyler dot bannister at remote-learner dot net
I was able to confirm the problem also exists in PHP 7.2.18.
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[2019-05-28 10:24:32] cmb@php.net
PHP 7.1 receives only security fixes. Can you reproduce the issue
with any of the actively supported PHP versions[1].
[1] <https://www.php.net/supported-versions.php>
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