NOTE: The following information is applicable to earlier versions of up.time. If you are using the current version, refer to the up.time product documentation for the latest information.
The Java heap is a repository for Java objects and free memory. The Java heap size should generally be increased when you have:
Adjusting the Java Heap Size
uptime is installed with a default Java Heap Size value of 1 Gb. For optimal performance, a value of 1.5 Gb is usually recommended.
NOTE: When increasing the Java Heap Size, ensure that the Operating System can support the new setting. If the OS does not have the desired amount of memory available exclusively for up.time, the up.time core will fail on startup.
RedHat, SuSE and Solaris Monitoring Stations
To change the Java Heap Size, modify the <uptime install dir>/uptime.lax (or uptime4d.lax in up.time 4) file to look like this:
NOTE: Java Heap Size is measured in bytes on UNIX and Linux systems.
# LAX.NL.JAVA.OPTION.JAVA.HEAP. SIZE.MAX # -------------------------------------- # Max VM size in bytes lax.nl.java.option.java.heap.size.max=1500m
Windows Monitoring Station
To change the Java Heap Size on a Windows system, edit the following line in the <uptime install dir>/wrapper.conf file:
Note: Java Heap Size is measured in megabytes on Windows systems.
up.time does not start - Java heap size too high
If the up.time 4 Data Collector fails to start and messages like those below are found in the wrapper.log you may have to adjust your java heap size to a lower value. wrapper.log: ........ STATUS...
By: uptime Support | Date Created: 10-10-2009 | Last Modified: 8-13-2011 | Index: 422
IOException: Not enough space (Java heap)
This article explains the IOException: Not enough space message and how to resolve it.
By: uptime Support | Date Created: 1-12-2007 | Last Modified: 7-6-2011 | Index: 115
Java heap space Throwable: java.lang.OutOfMemoryError
Example error message: 2010-07-09 16:42:41,654 ERROR (PerfERDC:137) - service Platform Performance Gatherer (192) on host DKLBMMDB1 (34) Error getting data from agent: Java heap space Throwable:...
By: uptime Support | Date Created: 8-26-2010 | Last Modified: 8-10-2011 | Index: 495
Query to retrieve MySQL database size
If you need to figure out how much data a MySQL database is consuming use the information_schema database and run the following: mysql> use information_schema; mysql> select table_schema,...
By: uptime Support | Date Created: 10-7-2009 | Last Modified: 8-10-2011 | Index: 386
Apache access.log file size keeps growing
For web servers that are very heavily loaded with many users making many requests, the "access.log" file will continue to grow in size until it is removed. Simply removing it while Apache is...
By: uptime Support | Date Created: 10-1-2009 | Last Modified: 5-4-2012 | Index: 377