On Tue, Jul 27, 2004 at 05:28:56PM -0700, Sunitha Kumar wrote: : Do we know if 5.0.19 can work with NPTL?
This has to do with the underlying JDK, not Tomcat. If your JDK hasn't been recompiled to take advantage of NPTL then it may very well stumble through an NPTL environment.
Based on the number of "set LD_ASSUME_KERNEL" posts I've seen on this list, I'd say the Sun JDK isn't NPTL-aware. ;)
I've been running Tomcat (previously version 5.0.25, now 5.0.27) using Java 1.4.2_05-b04 on Fedora Core 1 and 2 without any issues at all.
As I understand it, if the JDK is using Posix threads (which it does), then it is using NPTL threads by default, unless you set LD_ASSUME_KERNEL to 2.2.5.
You can verify this by running `ps -auxf`, if the Java process appears only once, it is running using NPTL, if it appears as a big tree of processes, you are not. The JDK-1.5 beta releases have run Tomcat just fine in my limited testing.
FWIW, the problems with the JDK crashing or hanging when using NPTL were a combination of JDK and glibc bugs. In all cases, they can be fixed by making sure you are running the latest JDK and glibc for your Linux distribution.
-Dave
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