This page provides instructions for changing the Java heap space (Xmx) for both Cassandra and TWCloud on Linux and Windows, respectively.
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Configuring Java heap space for Cassandra
On Linux
To configure Java heap space for Cassandra on Linux, you must set it from the variables, variables MAX_HEAP_SIZEand HEAPHEAP_NEWSIZE which are commented by default in the file cassandra-env.sh. The location of the file cassandra-env.sh depends on the type of Cassandra installation.
Uncomment MAX_HEAP_SIZE, HEAP_NEWSIZEvariables and adjust MAX_HEAP_SIZEmanually. Otherwise, Cassandra will calculate the heap size based on the system's memory using the following formula:
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Calculating Java heap size
max(min (1/2 ram), 1024MB), min(1/4 ram, 8GB))
The formula details are outlined below:
For the system memory 0-2 GB: use half of it.
For the system memory 2-4 GB: use 1 GB.
For the system memory 4-32 GB: use a quarter of it.
For the system memory more than 32 GB: use 8 GB.
On Windows
We recommend setting the min (-Xms) and max (-Xmx) heap to the same value in the Cassandra document to avoid pausing the GC during resizing.
To change the value using the Registry Editor
1. Run regedit from the command line 2. Browse for the key HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Apache Software Foundation\Procrun 2.0\cassandra\Parameters\Java. 3. Right-click Options and select Modify.... You can then change the min and max heap size from -Xms and -Xmx.
Configuring Java heap space for TWCloud
On Linux
If you start TWCloud from the executable file twcloud, you can configure the -Xmx parameter from the file jvm.options options (located in the same folder).
On Windows
If you start TWCloud from the executable file twcloud.exe, you can configure the -Xmx parameter from the file jvm.options options (located in the same folder).
If you start TWCloud from a Windows service, you must use the Registry Editor to update the value.
To change the value using the Registry Editor
1. Run regedit from the command line. 2. Browse for the key HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Apache Software Foundation\Procrun 2.0\Teamwork Cloud\Parameters\Java. 3. Right-click JvmMx and select Modify.... 4. Select Base to Decimal and change the value. The value is in megabytes (mb).
Configuring Java heap space for WebApp
Heap space for WebApp is handled by Tomcat.
On Linux
Heap settings are located in /opt/local/TeamworkCloud<install_root>/WebAppPlatform/bin/setenv.sh JVM_OPTS="-server -XX:+UseParallelGC -Xms4096M -Xmx8192M"
On Windows
The heap setting for WebApp is located in the registry
To change the value using the Registry Editor
1. Run regedit from the command line. 2. Browse for the key HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Apache Software Foundation\Procrun 2.0\WebApp\Parameters\Java. 3. Right-click JvmMx and select Modify.... 4. Select Base to Decimal and change the value. The value is in megabytes (mb).