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I have two machines, one running 2.4.18 and one running 2.4.20. Both run Java 1.5 build 13. On one machine (2.4.18), each thread shows up as a separate process in the ps output, and on the other the whole JVM shows up as one process. What is the distinguishing factor and can I control it?
I believe this was to do with how the Linux kernel and/or the
pscommand handled multi-threaded processes. Earlier versions displayed each thread as a separate entry, newer versions merged them into one.I was under the impression that this changed with kernel 2.6, but it seems it changed earlier than that.
I don’t think there’s anything you can do to fix this, short of upgrading the kernel. Perhaps an upgrade to
psmight fix it, if that’s actually where the problem was.