Unable to increase the number of MSC Service Threads beyond 8

Environment

• JBoss Enterprise Application Platform (EAP)
  • 6.4.9+
  • 7

Issue

We are deploying a large number of applications in EAP. With the default settings, the server is getting blocked at some point, so we added the following system property to increase the number of MSC Service Threads:

   JAVA_OPTS="$JAVA_OPTS -Dorg.jboss.server.bootstrap.maxThreads=60"

This has worked in earlier EAP 6.4.x versions, but no longer works after applying the latest patch.

Resolution

In order to increase the number of MSC Service Threads, define the following two system properties:

   JAVA_OPTS="$JAVA_OPTS -Dorg.jboss.server.bootstrap.maxThreads=60"
   JAVA_OPTS="$JAVA_OPTS -Djboss.msc.max.container.threads=60"

Root Cause

In order to limit the number of MSC System Threads, a new system property has been introduced in the MSC component ¹. This has been pulled into EAP 6.4 with the patch release #9 ².

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