Cannot load Latest data, PHP Fatal error: Allowed memory size of [..] bytes exhausted

[liquidsnake1989]

I'm running Zabbix 2.2.5 on CentOS 6.5, on which I'm monitoring the following:

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However, since a couple of days ago, whenever I try to load Monitoring > Latest Data, the page loads for about 1,5 minutes, and then stops, showing me nothing (not even the dropdown list where I can choose different host groups), see screenshot:

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I checked the /var/log/httpd/error_log, and I see the following error:

[error] [client 10.10.0.34] PHP Fatal error:  Allowed memory size of 134217728 bytes exhausted (tried to allocate 1048576 bytes) in /usr/share/zabbix/latest.php on line 509, referer: http://172.22.20.70/zabbix/dashboard.php?ddreset=1&sid=0f4a1c23a87179ed

After searching the net this morning, I discovered that you should change the /etc/php.ini, and increase the memory limit. I set mine to 512M, and this also shows up in my PhpInfo script:

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However, after restarting the httpd service (heck, I even rebooted the entire server a couple of times), the same error in /var/log/httpd/error_log keeps showing up.

Then I discovered this topic here on the Zabbix forums: https://www.zabbix.com/forum/showthr...006#post142006

So I changed the zabbix_server.conf file aswell, to the following values:

CacheSize=32M
HistoryCacheSize=16M
TrendCacheSize=8M
HistoryTextCacheSize=32M
ValueCacheSize=64M

Again, rebooted entire server, but still the error log shows the same.

So my questions are:

1. Where does he come across the 'limit' of 134217728 bytes (roughly 134.22 MB), even if I set the limit globally (in the php.ini) to 512MB?
2. How do I fix this?

[ingus.vilnis]

Hello and welcome to Zabbix forums!

You may have encountered a somewhat known issue in larger environments also known as slow latest data.

https://support.zabbix.com/browse/ZBX-7373

Here will be some very general pointers for you:
Regarding zabbix_server.conf - don't just take the values from another post. You have to tune them according to the performace data of your zabbix instance.
This is a very good article on that: http://blog.zabbix.com/scalable-zabb...400-nvps/2615/

This forum post also can be helpful: https://www.zabbix.com/forum/showthread.php?t=46594

Tune your database.

Tune your PHP but not too much. You can set memory_limit to 1G but only if your server memory resources allow. Setting more than 2G makes no sense anyways.

And the last one - in Zabbix frontend go to Administration -> General
Dropdown first entry: None

That will allow to open Latest data page but you will have to select specific hosts or groups.

Best Regards,
Ingus