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annotate src/share/vm/Xusage.txt @ 9126:bc26f978b0ce

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HotSpotResolvedObjectType: implement hasFinalizeSubclass() correctly don't use the (wrong) cached value, but ask the runtime on each request. Fixes regression on xml.* benchmarks @ specjvm2008. The problem was: After the constructor of Object was deoptimized due to an assumption violation, it was recompiled again after some time. However, on recompilation, the value of hasFinalizeSubclass for the class was not updated and it was compiled again with a, now wrong, assumption, which then triggers deoptimization again. This was repeated until it hit the recompilation limit (defined by PerMethodRecompilationCutoff), and therefore only executed by the interpreter from now on, causing the performance regression.
author Bernhard Urban <bernhard.urban@jku.at>
date Mon, 15 Apr 2013 19:54:58 +0200
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children
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1 -Xmixed mixed mode execution (default)
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2 -Xint interpreted mode execution only
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3 -Xbootclasspath:<directories and zip/jar files separated by ;>
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4 set search path for bootstrap classes and resources
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5 -Xbootclasspath/a:<directories and zip/jar files separated by ;>
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6 append to end of bootstrap class path
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7 -Xbootclasspath/p:<directories and zip/jar files separated by ;>
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8 prepend in front of bootstrap class path
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9 -Xnoclassgc disable class garbage collection
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10 -Xincgc enable incremental garbage collection
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11 -Xloggc:<file> log GC status to a file with time stamps
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12 -Xbatch disable background compilation
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13 -Xms<size> set initial Java heap size
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14 -Xmx<size> set maximum Java heap size
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15 -Xss<size> set java thread stack size
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16 -Xprof output cpu profiling data
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17 -Xfuture enable strictest checks, anticipating future default
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18 -Xrs reduce use of OS signals by Java/VM (see documentation)
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19 -Xcheck:jni perform additional checks for JNI functions
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20 -Xshare:off do not attempt to use shared class data
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21 -Xshare:auto use shared class data if possible (default)
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22 -Xshare:on require using shared class data, otherwise fail.
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23
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24 The -X options are non-standard and subject to change without notice.