Fragment the Heap! ...let the compiler / VM implementors deal with - PowerPoint PPT Presentation

Dec 03, 2022 •368 likes •466 views

Fragment the Heap! ...let the compiler / VM implementors deal with fragmentation! Dr. Fridtjof Siebert CTO, aicas ISMM 2008, Tucson, 8. June 2008 Fragment the Heap! Split Heap in small fixed-size blocks Allocate only these blocks smaller

Fragment the Heap! ...let the compiler / VM implementors deal with fragmentation! Dr. Fridtjof Siebert CTO, aicas ISMM 2008, Tucson, 8. June 2008
Fragment the Heap! Split Heap in small fixed-size blocks Allocate only these blocks ● smaller objects use one block ● larger objects use graph of blocks Let the VM/compiler emit code to access these objects! 2
Fragment the Heap! Objects and Arrays Block 1 (Header) Block 2 Block 3 head field 5 field 12 type field 6 field 13 monitor field 7 field 14 field 1 field 8 field 15 ― field 2 field 9 ― field 3 field 10 ― field 4 field 11 ― next next 3
Fragment the Heap! Objects and Arrays head type length depth element 0 element 1 element 2 element 3 4
Fragment the Heap! Objects and Arrays element 0 element 1 element 2 element 3 element 4 element 5 element 6 element 7 element 8 element 9 head element 10 type element 11 length element 12 depth element 13 link 0 element 14 link 1 element 15 link 2 link 3 element 16 element 17 element 18 element 19 element 20 element 21 element 22 element 23 element 24 element 25 element 26 element 27 element 28 element 29 element 30 5 element 31
element 97 element 98 element 99 element 100 element 101 element 102 element 103 element 104 element 105 Fragment the Heap! element 106 element 107 element 108 Objects and Arrays element 109 element 110 element 111 link 0 element 112 link 1 element 113 link 2 element 114 link 3 element 115 link 4 element 116 link 5 element 117 link 6 element 118 link 7 element 119 element 120 link 8 element 121 link 9 head element 122 link 10 type element 123 link 11 length element 124 link 12 depth element 125 link 13 link 0 element 126 link 14 link 1 element 127 link 15 link 2 link 3 element 128 link 16 element 129 link 17 element 130 link 18 element 131 link 19 element 132 link 20 element 133 link 21 element 134 link 22 element 135 link 23 element 136 link 24 element 137 link 25 element 138 link 26 element 139 link 27 element 140 link 28 element 141 link 29 element 142 link 30 6 element 143 link 31 element 144 element 145
Fragment the Heap! Pro's GC ● no compaction phase ● unique GC mark & sweep steps ● no tricks (pinning, arraylets, etc.) ● no coalescing ● only one free list VM compiler ● no handles, forwarding ptrs, ... ● no pointer updates ● alloc never fails due to fragmentation 7
Fragment the Heap! Pro's Parallel systems ● very simple free list ● no locks, free list modifications via CAS ● simple stealing, blancing, etc. between processors ● David Bacon: Look at pathological case! 8
Fragment the Heap! Any relevant Con's? 9

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