I run Geronimo 1.1.1 on a IBM zOS mainframe using the JZOS umbrella and the Java jsdk 1.5 from its USS environment. The project is a SOA on the top of a JCA 1.5 technology connector to access (via JNI zOS inter-process over tcp/ip) a wel known CM product on this platform . In comparison with the distributed version of this project developed on the Windows platform, the mainframe instance behaves relatively slow and does not take advantage of the huge amount of mips of this blue machine! Before diving into the profiling effort, I do have a suspicion about the zOS proprietary JVM and mainly about its native thread support. This item is not very popular on the web, Google Search is not verbose. My questions to the geronimo folk are: have you information from zOS or a confirmation of potential troubles when running with a JVM without OS threads capability or any good idea to figure out which piece of code should slow down.
thanks Dom.
