Mercurial > hg > graal-compiler
diff src/share/vm/runtime/globals.hpp @ 1145:e018e6884bd8
6631166: CMS: better heuristics when combatting fragmentation
Summary: Autonomic per-worker free block cache sizing, tunable coalition policies, fixes to per-size block statistics, retuned gain and bandwidth of some feedback loop filters to allow quicker reactivity to abrupt changes in ambient demand, and other heuristics to reduce fragmentation of the CMS old gen. Also tightened some assertions, including those related to locking.
Reviewed-by: jmasa
| author | ysr |
|---|---|
| date | Wed, 23 Dec 2009 09:23:54 -0800 |
| parents | 473cce303f13 |
| children | 504830073409 |
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--- a/src/share/vm/runtime/globals.hpp Wed Dec 16 15:12:51 2009 -0800 +++ b/src/share/vm/runtime/globals.hpp Wed Dec 23 09:23:54 2009 -0800 @@ -1355,10 +1355,46 @@ product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ "The desired number of objects to claim from the overflow list") \ \ - product(uintx, CMSParPromoteBlocksToClaim, 50, \ + product(uintx, CMSParPromoteBlocksToClaim, 16, \ "Number of blocks to attempt to claim when refilling CMS LAB for "\ "parallel GC.") \ \ + product(uintx, OldPLABWeight, 50, \ + "Percentage (0-100) used to weight the current sample when" \ + "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \ + \ + product(bool, ResizeOldPLAB, true, \ + "Dynamically resize (old gen) promotion labs") \ + \ + product(bool, PrintOldPLAB, false, \ + "Print (old gen) promotion labs sizing decisions") \ + \ + product(uintx, CMSOldPLABMin, 16, \ + "Min size of CMS gen promotion lab caches per worker per blksize")\ + \ + product(uintx, CMSOldPLABMax, 1024, \ + "Max size of CMS gen promotion lab caches per worker per blksize")\ + \ + product(uintx, CMSOldPLABNumRefills, 4, \ + "Nominal number of refills of CMS gen promotion lab cache" \ + " per worker per block size") \ + \ + product(bool, CMSOldPLABResizeQuicker, false, \ + "Whether to react on-the-fly during a scavenge to a sudden" \ + " change in block demand rate") \ + \ + product(uintx, CMSOldPLABToleranceFactor, 4, \ + "The tolerance of the phase-change detector for on-the-fly" \ + " PLAB resizing during a scavenge") \ + \ + product(uintx, CMSOldPLABReactivityFactor, 2, \ + "The gain in the feedback loop for on-the-fly PLAB resizing" \ + " during a scavenge") \ + \ + product(uintx, CMSOldPLABReactivityCeiling, 10, \ + "The clamping of the gain in the feedback loop for on-the-fly" \ + " PLAB resizing during a scavenge") \ + \ product(bool, AlwaysPreTouch, false, \ "It forces all freshly committed pages to be pre-touched.") \ \ @@ -1400,27 +1436,54 @@ "Percentage (0-100) by which the CMS incremental mode duty cycle" \ " is shifted to the right within the period between young GCs") \ \ - product(uintx, CMSExpAvgFactor, 25, \ - "Percentage (0-100) used to weight the current sample when " \ - "computing exponential averages for CMS statistics") \ - \ - product(uintx, CMS_FLSWeight, 50, \ - "Percentage (0-100) used to weight the current sample when " \ - "computing exponentially decating averages for CMS FLS statistics") \ - \ - product(uintx, CMS_FLSPadding, 2, \ - "The multiple of deviation from mean to use for buffering " \ + product(uintx, CMSExpAvgFactor, 50, \ + "Percentage (0-100) used to weight the current sample when" \ + "computing exponential averages for CMS statistics.") \ + \ + product(uintx, CMS_FLSWeight, 75, \ + "Percentage (0-100) used to weight the current sample when" \ + "computing exponentially decating averages for CMS FLS statistics.") \ + \ + product(uintx, CMS_FLSPadding, 1, \ + "The multiple of deviation from mean to use for buffering" \ "against volatility in free list demand.") \ \ product(uintx, FLSCoalescePolicy, 2, \ "CMS: Aggression level for coalescing, increasing from 0 to 4") \ \ - product(uintx, CMS_SweepWeight, 50, \ + product(bool, FLSAlwaysCoalesceLarge, false, \ + "CMS: Larger free blocks are always available for coalescing") \ + \ + product(double, FLSLargestBlockCoalesceProximity, 0.99, \ + "CMS: the smaller the percentage the greater the coalition force")\ + \ + product(double, CMSSmallCoalSurplusPercent, 1.05, \ + "CMS: the factor by which to inflate estimated demand of small" \ + " block sizes to prevent coalescing with an adjoining block") \ + \ + product(double, CMSLargeCoalSurplusPercent, 0.95, \ + "CMS: the factor by which to inflate estimated demand of large" \ + " block sizes to prevent coalescing with an adjoining block") \ + \ + product(double, CMSSmallSplitSurplusPercent, 1.10, \ + "CMS: the factor by which to inflate estimated demand of small" \ + " block sizes to prevent splitting to supply demand for smaller" \ + " blocks") \ + \ + product(double, CMSLargeSplitSurplusPercent, 1.00, \ + "CMS: the factor by which to inflate estimated demand of large" \ + " block sizes to prevent splitting to supply demand for smaller" \ + " blocks") \ + \ + product(bool, CMSExtrapolateSweep, false, \ + "CMS: cushion for block demand during sweep") \ + \ + product(uintx, CMS_SweepWeight, 75, \ "Percentage (0-100) used to weight the current sample when " \ "computing exponentially decaying average for inter-sweep " \ "duration") \ \ - product(uintx, CMS_SweepPadding, 2, \ + product(uintx, CMS_SweepPadding, 1, \ "The multiple of deviation from mean to use for buffering " \ "against volatility in inter-sweep duration.") \ \ @@ -1459,6 +1522,13 @@ product(uintx, CMSIndexedFreeListReplenish, 4, \ "Replenish and indexed free list with this number of chunks") \ \ + product(bool, CMSReplenishIntermediate, true, \ + "Replenish all intermediate free-list caches") \ + \ + product(bool, CMSSplitIndexedFreeListBlocks, true, \ + "When satisfying batched demand, splot blocks from the " \ + "IndexedFreeList whose size is a multiple of requested size") \ + \ product(bool, CMSLoopWarn, false, \ "Warn in case of excessive CMS looping") \ \ @@ -1593,6 +1663,18 @@ "Bitmap operations should process at most this many bits" \ "between yields") \ \ + product(bool, CMSDumpAtPromotionFailure, false, \ + "Dump useful information about the state of the CMS old " \ + " generation upon a promotion failure.") \ + \ + product(bool, CMSPrintChunksInDump, false, \ + "In a dump enabled by CMSDumpAtPromotionFailure, include " \ + " more detailed information about the free chunks.") \ + \ + product(bool, CMSPrintObjectsInDump, false, \ + "In a dump enabled by CMSDumpAtPromotionFailure, include " \ + " more detailed information about the allocated objects.") \ + \ diagnostic(bool, FLSVerifyAllHeapReferences, false, \ "Verify that all refs across the FLS boundary " \ " are to valid objects") \ @@ -1677,6 +1759,10 @@ "The youngest generation collection does not require " \ "a guarantee of full promotion of all live objects.") \ \ + product(bool, PrintPromotionFailure, false, \ + "Print additional diagnostic information following " \ + " promotion failure") \ + \ notproduct(bool, PromotionFailureALot, false, \ "Use promotion failure handling on every youngest generation " \ "collection") \