Active items not acheiving 1s interval

[Wexiwa]

Hi,

We are trying to set up few active items configured with a 1 second interval. However those items don't keep up the interval, instead we are gathering a value every ~30 seconds (as seen on the corresponding graph).
Testing the above with a simple "echo 1" as user paramater on the client side, which should be sent every 1 second without delay.

We looked at the configurations files both on the server/client, but didn't see what could help us achieve this (apart from adding more pollers).

What could be the reasons of this behavior and/or how to find the bottleneck ?
As I saw in the sticky post, is tweaking MySQL mandatory on a relatively new and small setup ?

https://www.zabbix.com/forum/showthread.php?t=9925

Thank you

[batchenr]

when you go to the grafe section or load a page in zabbix server with a lot of
info does it take a lot of time ?

[kloczek]

Hi,

We are trying to set up few active items configured with a 1 second interval. However those items don't keep up the interval, instead we are gathering a value every ~30 seconds (as seen on the corresponding graph).
Testing the above with a simple "echo 1" as user paramater on the client side, which should be sent every 1 second without delay.

We looked at the configurations files both on the server/client, but didn't see what could help us achieve this (apart from adding more pollers).

Are you sure that changed configuration of the items have been propagated down to agent?
How long after change item setting it was still 30s interval?

[Wexiwa]

Hi,

Thank you for your replies!

when you go to the grafe section or load a page in zabbix server with a lot of
info does it take a lot of time ?

Not really, unless when I configure a graph to see a big period of time, showing lots of values, It take a bit to render the graph (not that much).

Are you sure that changed configuration of the items have been propagated down to agent?
How long after change item setting it was still 30s interval?

Yes, I am sure it is well configured as the items were at 1s interval from the beginning.

I think I found the issue as it seems that the agent is processing active items sequentially. Because when I test with only one item, zabbix is able to reach 1s interval. Then, when I add more items, the interval is not respected anymore. As the user parameters behind my items is a program that take at most 1s to process (mainly waiting for an answer) this explains this behavior.

[jan.garaj]

There is only one Zabbix agent thread to process active items, so your 1sec userparameter block other items to be collected -> yes it's sequential processing