277 // be able to build a fully supported product that nonetheless also |
277 // be able to build a fully supported product that nonetheless also |
278 // ships with some unsupported, lightly tested, experimental features. |
278 // ships with some unsupported, lightly tested, experimental features. |
279 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding |
279 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding |
280 // UnlockExperimentalVMOptions flag, which allows the control and |
280 // UnlockExperimentalVMOptions flag, which allows the control and |
281 // modification of the experimental flags. |
281 // modification of the experimental flags. |
|
282 // |
|
283 // Nota bene: neither diagnostic nor experimental options should be used casually, |
|
284 // and they are not supported on production loads, except under explicit |
|
285 // direction from support engineers. |
282 // |
286 // |
283 // manageable flags are writeable external product flags. |
287 // manageable flags are writeable external product flags. |
284 // They are dynamically writeable through the JDK management interface |
288 // They are dynamically writeable through the JDK management interface |
285 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. |
289 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. |
286 // These flags are external exported interface (see CCC). The list of |
290 // These flags are external exported interface (see CCC). The list of |
1807 "(other young collectors) ") \ |
1811 "(other young collectors) ") \ |
1808 \ |
1812 \ |
1809 develop(uintx, PromotionFailureALotInterval, 5, \ |
1813 develop(uintx, PromotionFailureALotInterval, 5, \ |
1810 "Total collections between promotion failures alot") \ |
1814 "Total collections between promotion failures alot") \ |
1811 \ |
1815 \ |
1812 develop(intx, WorkStealingSleepMillis, 1, \ |
1816 experimental(intx, WorkStealingSleepMillis, 1, \ |
1813 "Sleep time when sleep is used for yields") \ |
1817 "Sleep time when sleep is used for yields") \ |
1814 \ |
1818 \ |
1815 develop(uintx, WorkStealingYieldsBeforeSleep, 1000, \ |
1819 experimental(uintx, WorkStealingYieldsBeforeSleep, 1000, \ |
1816 "Number of yields before a sleep is done during workstealing") \ |
1820 "Number of yields before a sleep is done during workstealing") \ |
1817 \ |
1821 \ |
1818 develop(uintx, WorkStealingHardSpins, 4096, \ |
1822 experimental(uintx, WorkStealingHardSpins, 4096, \ |
1819 "Number of iterations in a spin loop between checks on " \ |
1823 "Number of iterations in a spin loop between checks on " \ |
1820 "time out of hard spin") \ |
1824 "time out of hard spin") \ |
1821 \ |
1825 \ |
1822 develop(uintx, WorkStealingSpinToYieldRatio, 10, \ |
1826 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ |
1823 "Ratio of hard spins to calls to yield") \ |
1827 "Ratio of hard spins to calls to yield") \ |
1824 \ |
1828 \ |
1825 product(uintx, PreserveMarkStackSize, 1024, \ |
1829 product(uintx, PreserveMarkStackSize, 1024, \ |
1826 "Size for stack used in promotion failure handling") \ |
1830 "Size for stack used in promotion failure handling") \ |
1827 \ |
1831 \ |