Memory usage problem

[saryas]

Hello, i've been using cacti for 3 weeks now on CentOS 5 and it is running very well except a problem with the memory usage. it varies alot which is not good for me because im using cacti to monitor a big network. i don't want to run out of memory...
please provide me with any solution you can think about!!

Thank you in advance!!

[Hyperlord]

Hi,

Could you please provide a graph of your MySQL Querycache, Memory usage and settings (res limits) from php.ini?

brgds

[saryas]

Hello,

This is the mysql query cache:

mysql> show variables like 'have_query_cache';
+------------------+-------+
| Variable_name | Value |
+------------------+-------+
| have_query_cache | YES |
+------------------+-------+
1 row in set (0.00 sec)

mysql> show status like 'have_query_cache';
Empty set (0.00 sec)

mysql> show status like 'Qcache%';
+-------------------------+-------+
| Variable_name | Value |
+-------------------------+-------+
| Qcache_free_blocks | 0 |
| Qcache_free_memory | 0 |
| Qcache_hits | 0 |
| Qcache_inserts | 0 |
| Qcache_lowmem_prunes | 0 |
| Qcache_not_cached | 0 |
| Qcache_queries_in_cache | 0 |
| Qcache_total_blocks | 0 |
+-------------------------+-------+
8 rows in set (0.00 sec)


and here are my resource limits:

max_execution_time = 30 ; Maximum execution time of each script, in seconds
max_input_time = 60 ; Maximum amount of time each script may spend parsing request data
memory_limit = 128M ; Maximum amount of memory a script may consume

I attached the graphs monitoring my CentOS.

thanks alot!!

[Hyperlord]

Hi,

sry was outside at customers all day long.
Could you please import the poller statistics template to check if cacti itself might cause this? I think the memory usage is kind of..."strange"

http://docs.cacti.net/usertemplate:host:cacti:poller

Which poller do you use? Spine or CMD?
Do you have the Boost Plug-In activiated?
Have you checked "load balancing" in poller settings?

brgds

[saryas]

Hi,

I will import the poller statistics template and see the poller's performance and report the results i'm having. I'm using spine as a poller and boost plugin is activated too. I checked the "load balancing" in Poller settings and it set set to balance the process load.

Thank you!!

[Hyperlord]

Mornin',

could you please give some Details about your spine Settings?
-> Maximum Concurrent Poller Processes
-> Maximum Threads per Process
-> Number of PHP Script Servers

You do 5m polling, not 1m, don't you?

I guess after that we have enough infos to really investigate.

brgds

[saryas]

Hello again,

These are the Poller information:

Poller Information

Interval 60
Type spine
Items Action[0]: 4755
Action[1]: 5
Action[2]: 14
Total: 4774
Concurrent Processes 3
Max Threads 10
PHP Servers 5
Script Timeout 150
Max OID 20
Last Run Statistics Time:7.3443 Method:spine Processes:3 Threads:10 Hosts:89 HostsPerProcess:30 DataSources:4730 RRDsProcessed:2463

I will give you also my cacti informations:

General Information
Date Thu, 29 Apr 2010 11:53:43 +0300
Cacti Version 0.8.7e
Cacti OS : unix
SNMP Version : NET-SNMP version: 5.3.2.2
RRDTool Version : RRDTool 1.3.x
Hosts 88
Graphs 2498
Data Sources :
Script/Command: 5
SNMP: 217
SNMP Query: 2270
Script - Script Server (PHP): 14
Total: 2506

Thank you alot for your help!!

[TheWitness]

Please comprehend the difference between memory in use and cache memory for disk caching. Also, if you want to increase performance as the system increases in size, use Boost.

TheWitness

[saryas]

Hello,

I checked the boost plugin settings and it turned out to be not working. i checked the boost's log file and had the following warnings:

PHP Warning: Module 'PDO' already loaded in Unknown on line 0
PHP Warning: session_start(): open(/var/lib/php/session/sess_7lk01q92tue1ce3puet46v9td3, O_RDWR) failed: Permission denied (13) in /var/www/html/cacti/include/global.php on line 158
PHP Warning: Unknown: open(/var/lib/php/session/sess_7lk01q92tue1ce3puet46v9td3, O_RDWR) failed: Permission denied (13) in Unknown on line 0
PHP Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/lib/php/session) in Unknown on line 0

can you provide me with a solution for this problem please because i have no idea about how to resolve it!!

Thank you alot !!

[TheWitness]

chmod 777 on that directory.

[saryas]

Hello again,

I executed the chmod command on the path i had in the log file and i have no warnings about it anymore but i still have the following warning:

PHP Warning: Module 'PDO' already loaded in Unknown on line 0

how can i resolve it??

Thank you in advance!!!

[TheWitness]

Edit /etc/php.ini (could be also /etc/php/... too) and remove the duplicated extension line for PDO. Restart Apache afterwards.

TheWitness

[saryas]

Hello again,

I used boost plugin and here are some graphs showing the performance of cacti. As you can see cacti is using alot of space from the RAM, actually in 5 days the free memory space decreased from 1.7 M to 747 K which isn't normal. I dont want to have to restart my server every week.

what can be the problem??? might it be something wrong with boost configuration???

i really really appreciate any help!!

[saryas]

here is my boost plugin configuration:

[TheWitness]

That's normal, the memory is disk cache, which can be consumed by any process that needs memory. It's your rrdfiles, sitting in memory to increase performance. It's completely normal.

TheWitness