RFR: 8253495: CDS generates non-deterministic output

[Erik Joelsson]

On Tue, 8 Mar 2022 19:11:02 GMT, Ioi Lam <iklam at openjdk.org> wrote:

> This patch makes the result of "java -Xshare:dump" deterministic:
> - Disabled new Java threads from launching. This is harmless. See comments in jvm.cpp
> - Fixed a problem in hashtable ordering in heapShared.cpp
> - BasicHashtableEntry has a gap on 64-bit platforms that may contain random bits. Added code to zero it.
> - Enabled checking of $JAVA_HOME/lib/server/classes.jsa in make/scripts/compare.sh
> 
> Note:  $JAVA_HOME/lib/server/classes_ncoops.jsa is still non-deterministic. This will be fixed in [JDK-8282828](https://bugs.openjdk.java.net/browse/JDK-8282828).
> 
> Testing under way:
> - tier1~tier5
> - Run all *-cmp-baseline jobs 20 times each (linux-aarch64-cmp-baseline, windows-x86-cmp-baseline, .... etc).

compare.sh looks good. Can't comment on the rest. Thank you for fixing this!

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Marked as reviewed by erikj (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/7748