Memory leak issue, possibly because PHP APC add on.

I noticed that when I enabled APC it spawn so many apache process and it can consume memory really quickly. Our client server crashed twice because it ran out of memory.

Setup:
Linux CentOS 7
MariaDB
Apache 2.2
php 5.4.16 with APC
enabled JSMIN.
CPU : 4 cores
RAM : 12 GB

When I disabled the APC add on I didn't have that many apache processes being spawned and the RAM is hardly go beyond 3GB. I was doing a mass update that update the Account record and ALL of its related records, this is a massive operations but it didn't go beyond 3GB in terms of memory use when I have the APC disabled.

When I turned it on it was easily jumped from 2 GB to 6 GB.
is there a known issues with APC add on that you guys are aware off?

Parents

0 Alex Nassi over 10 years ago

This issue has been reported to our engineering team and is currently being investigated. The bug report is available as #73342. More information will be available as our team investigates this further.
0 Doddy Amijaya over 10 years ago in reply to Alex Nassi

Hi Alex,
I am glad and not so glad to hear that. I thought I am the only one having this issue.
Although on that bug report, it says it reported on version 7.5.2.1 while our customer is on 7.5.1.0 does it matter?
0 Justin Kuehlthau over 10 years ago in reply to Doddy Amijaya

We see this issue a lot when using APC and making Studio changes. I hope it gets fixed soon!
0 Michal Rodzos over 10 years ago in reply to Justin Kuehlthau

Thanks a lot Harold

For average Sugar installation the APC config we were using is
apc.shm_size = 512M
apc.shm_segments = 1
apc.optimization = 0
apc.slam_defense = On
apc.num_filed_hint = 2048
apc.ttl = 0
apc.enable_cli = 1
apc.max_file_size = 1M

I think we will try for a start ( subject to load testing and monitoring) following opcache settings:

opcache.memory_consumption = 256 or 512
opcache.max_file_size = 1M
opcache.interned_strings_buffer = 8
opcache.max_accelerated_files = 4000
opcache.fast_shutdown = 1
opcache.enable_cli = 1
opcache.revalidate_freq = 0
opcache.use_cwd = 1

Reply

0 Michal Rodzos over 10 years ago in reply to Justin Kuehlthau

Thanks a lot Harold

For average Sugar installation the APC config we were using is
apc.shm_size = 512M
apc.shm_segments = 1
apc.optimization = 0
apc.slam_defense = On
apc.num_filed_hint = 2048
apc.ttl = 0
apc.enable_cli = 1
apc.max_file_size = 1M

I think we will try for a start ( subject to load testing and monitoring) following opcache settings:

opcache.memory_consumption = 256 or 512
opcache.max_file_size = 1M
opcache.interned_strings_buffer = 8
opcache.max_accelerated_files = 4000
opcache.fast_shutdown = 1
opcache.enable_cli = 1
opcache.revalidate_freq = 0
opcache.use_cwd = 1

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