Showing posts with label jboss. Show all posts
Showing posts with label jboss. Show all posts
Thursday 5 June 2014
Setting Up JVM Heap Size In JBoss OpenShift Origin
Openshift is an awesome technology and have fell in love with it recently. In this post, I will talk about how we can set JVM Heap Size for your application using Jboss cartridge.
If you look into the content of the standalone.conf located at $OPENSHIFT_JBOSSEAP_DIR/bin, you can see that JVM_HEAP_RATIO is set to 0.5 if it is not already set.
And, later this ratio is used to calculate the max_heap so as to inject the maximum heap size in jboss java process. You can see how gear memory size is used to calculate the value of heap size. This is the very reason why the default installation allocates half of total gear memory size.
OpenShift keeps its number of environment variables inside /var/lib/openshift/OPENSHIFT_GEAR_UUID/.env so what I did was SSH to my OO node and run the command below (you should replace your gear's UUID):
Alternatively, rhc set-env JVM_HEAP_RATIO=0.7 -a appName should also work but I have not tried it.
Read more...
If you look into the content of the standalone.conf located at $OPENSHIFT_JBOSSEAP_DIR/bin, you can see that JVM_HEAP_RATIO is set to 0.5 if it is not already set.
if [ -z "$JVM_HEAP_RATIO" ]; then JVM_HEAP_RATIO=0.5
And, later this ratio is used to calculate the max_heap so as to inject the maximum heap size in jboss java process. You can see how gear memory size is used to calculate the value of heap size. This is the very reason why the default installation allocates half of total gear memory size.
max_memory_mb=${OPENSHIFT_GEAR_MEMORY_MB} max_heap=$( echo "$max_memory_mb * $JVM_HEAP_RATIO" | bc | awk '{print int($1+0.5)}')
OpenShift keeps its number of environment variables inside /var/lib/openshift/OPENSHIFT_GEAR_UUID/.env so what I did was SSH to my OO node and run the command below (you should replace your gear's UUID):
$ echo -n 0.7 > /var/lib/openshift/52e8d31bfa7c355caf000039/.env/JVM_HEAP_RATIO
Alternatively, rhc set-env JVM_HEAP_RATIO=0.7 -a appName should also work but I have not tried it.
Read more...
Setting Up JVM Heap Size In JBoss OpenShift Origin
2014-06-05T10:36:00+05:45
Cool Samar
centos|fedora|java|jboss|linux|openshift|sysadmin|
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