Heap Size Sweet Spot for LiveCycle ES2

Customers often ask about the proper heap size setting for LiveCycle ES2. The answer quite often is “it depends”. However, an interesting set of eight, one-hour tests indicate that at least for the eTech LiveCycle Benchmark, the memory sweet spot is about 5 GB. The test hardware was a Dell Precision 690 Workstation with 12 GB of RAM, and two dual-core (4 cores total) Intel Xeon 5160 “Woodcrest” 3.0 GHz CPUs. Test software was LiveCycle ES2 SP2/JBoss 4.2.1/Windows Server 2008/Oracle 11g.

The default memory configuration for the pre-configured JBoss tree that LiveCycle ES2 ships with is the following:
-Xms1024m -Xmx1792m -XX:PermSize=256m -XX:MaxPermSize=384m

The throughput achieved with this configuration was 4,862 (transactions/hr with 10 concurrent users).

However, by increasing heap size in steps as well as by configuring garbage collection, we were able to achieve a throughput of 5,709 at a heap size setting of 5 GB. Please see the profile below.

The memory configuration was as follows:
-Xms5120m -Xmx5120m -XX:PermSize=512m -XX:MaxPermSize=512m

The garbage collection configuration was as follows:
-XX:+UseParallelGC -XX:+UseParallelOldGC -XX:ParallelGCThreads=4 -XX:NewRatio=1 -XX:MaxTenuringThreshold=100

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