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8000968: NPG: UseCompressedKlassPointers asserts with ObjectAlignmentInBytes for > 32G CompressedOops

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Pick a base that works for both CompressedOpps alignment and CompressedKlassPtrs alignment.

Reviewed-by: kvn, roland
This commit is contained in:
Harold Seigel 2013-02-04 08:26:02 -05:00
parent 6c6a537471
commit 1831def9cc
5 changed files with 154 additions and 20 deletions
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19
hotspot/src/share/vm/runtime/arguments.cpp
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@ -1446,13 +1446,18 @@ void Arguments::set_ergonomics_flags() {
}
// Set the ClassMetaspaceSize to something that will not need to be
// expanded, since it cannot be expanded.
if (UseCompressedKlassPointers && FLAG_IS_DEFAULT(ClassMetaspaceSize)) {
// 100,000 classes seems like a good size, so 100M assumes around 1K
// per klass. The vtable and oopMap is embedded so we don't have a fixed
// size per klass. Eventually, this will be parameterized because it
// would also be useful to determine the optimal size of the
// systemDictionary.
FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M);
if (UseCompressedKlassPointers) {
if (ClassMetaspaceSize > KlassEncodingMetaspaceMax) {
warning("Class metaspace size is too large for UseCompressedKlassPointers");
FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
} else if (FLAG_IS_DEFAULT(ClassMetaspaceSize)) {
// 100,000 classes seems like a good size, so 100M assumes around 1K
// per klass. The vtable and oopMap is embedded so we don't have a fixed
// size per klass. Eventually, this will be parameterized because it
// would also be useful to determine the optimal size of the
// systemDictionary.
FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M);
}
}
}
// Also checks that certain machines are slower with compressed oops