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question asked: Jan 04 '13, 1:33 p.m.
question was seen: 4,985 times
last updated: Jan 04 '13, 1:43 p.m.

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Loading a large workspace takes longer in RTC 4.0.0.1

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Matt Lennon (612●2●5) | asked Jan 04 '13, 1:33 p.m.
JAZZ DEVELOPER
After upgrading from 3.0.1.3 to 4.0.0.1, the time to load a build workspace (300,000 files) with the JBE went from 15 minutes to 25 minutes. We noticed that when a build is started, there is a service ""GetFilebyVersion" on the CCM admin page that ran for about 10 minutes before the JBE started to load files. In 3.0.1.3, this service only runs for about 30 seconds.

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Matt Lennon (612●2●5) | answered Jan 04 '13, 1:43 p.m.
JAZZ DEVELOPER
This is probably due to defect 188935, which is caused by a performance problem in the Java utility class java.util.IdentityHashMap introduced in IBM Java 6, which is bundled with RTC starting in 4.0:

If you generate a server thread dump while the GetFileByVersion service is running, you will probably see a thread stack that looks like this: 
3XMTHREADINFO3           Java callstack:
4XESTACKTRACE                at java/util/IdentityHashMap.findIndex(IdentityHashMap.java:420(Compiled Code))
4XESTACKTRACE                at java/util/IdentityHashMap.containsKey(IdentityHashMap.java:329(Compiled Code))
4XESTACKTRACE                at com/ibm/team/repository/client/internal/util/ClientUtil.makeImmutable(ClientUtil.java:183(Compiled Code))
This problem was fixed in IBM Java 6 SR11, which is bundled with RTC starting in 4.0.1. Upgrading the RTC server's JRE to IBM Java 6 SR11, or upgrading the server to RTC 4.0.1 should take care of the problem.

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