Locality-Optimized Resource Alignment for Superdome 2

Table Of Contents

Using mpsched to enforce good alignment for Java

HP-UX is usually able to achieve good alignment when running Java. Here are some guidelines for

explicit tunes to enforce good alignment when running multiple instances of the Java virtual machine.

We will assume that each Java instance is small enough in terms of processor and memory resources

to fit into a single locality. It is best to subdivide the Java instance if it exceeds the capacity of a

single locality.

Use the command mpsched –s to determine the number of localities in the partition and the locality

identifier corresponding to each locality. It is usually not necessary to use any launch policy if there

are fewer than three localities in the partition. If there are many localities, use commands similar to

the following to launch Java, distributing the Java virtual machines instances evenly across two

localities:

mpsched –l 2 java

mpsched –l 3 java

Since Java is highly threaded, it may be beneficial to set the numa_policy parameter to 3.