Reduce max old space size to 4096

[dapplion]

Motivation

There's a 1.5GB difference between total process memory and the heap used old-space-size. Current old-space-size value of 6000 causes machines with 8GB of ram to never OOM but stall.

Part of #3515

Description

Reduce max old space size to 4096.

• Testing shows that old space size oscillates between 1.5GB and 2GB. A 4GB wide safety margin
• Machines with 8GB will OOM when there's memory issues

[codeclimate]

Code Climate has analyzed commit ac494cb and detected 0 issues on this pull request.

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[codecov]

Codecov Report

Merging #3516 (ac494cb) into master (78b23bc) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3516   +/-   ##
=======================================
  Coverage   37.90%   37.90%           
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  Files         308      308           
  Lines        8129     8129           
  Branches     1248     1248           
=======================================
  Hits         3081     3081           
  Misses       4900     4900           
  Partials      148      148           

[github-actions]

Performance Report

✔️ no performance regression detected

Full benchmark results

Benchmark suite	Current: ee643f1	Previous: 78b23bc	Ratio
BeaconState.hashTreeRoot - No change	580.00 ns/op	772.00 ns/op	0.75
BeaconState.hashTreeRoot - 1 full validator	84.683 us/op	100.05 us/op	0.85
BeaconState.hashTreeRoot - 32 full validator	1.0641 ms/op	1.3217 ms/op	0.81
BeaconState.hashTreeRoot - 512 full validator	15.425 ms/op	15.814 ms/op	0.98
BeaconState.hashTreeRoot - 1 validator.effectiveBalance	75.953 us/op	90.577 us/op	0.84
BeaconState.hashTreeRoot - 32 validator.effectiveBalance	1.3063 ms/op	1.5115 ms/op	0.86
BeaconState.hashTreeRoot - 512 validator.effectiveBalance	17.989 ms/op	19.229 ms/op	0.94
BeaconState.hashTreeRoot - 1 balances	54.339 us/op	66.031 us/op	0.82
BeaconState.hashTreeRoot - 32 balances	475.59 us/op	556.66 us/op	0.85
BeaconState.hashTreeRoot - 512 balances	4.4786 ms/op	5.3087 ms/op	0.84
BeaconState.hashTreeRoot - 250000 balances	88.342 ms/op	102.04 ms/op	0.87
processSlot - 1 slots	39.012 us/op	41.149 us/op	0.95
processSlot - 32 slots	2.0817 ms/op	2.3730 ms/op	0.88
getCommitteeAssignments - req 1 vs - 250000 vc	5.2840 ms/op	6.3270 ms/op	0.84
getCommitteeAssignments - req 100 vs - 250000 vc	7.3427 ms/op	8.9598 ms/op	0.82
getCommitteeAssignments - req 1000 vs - 250000 vc	7.8861 ms/op	9.4782 ms/op	0.83
computeProposers - vc 250000	21.282 ms/op	23.801 ms/op	0.89
computeEpochShuffling - vc 250000	201.60 ms/op	219.80 ms/op	0.92
getNextSyncCommittee - vc 250000	339.24 ms/op	390.62 ms/op	0.87
altair processAttestation - 250000 vs - 7PWei normalcase	43.194 ms/op	41.010 ms/op	1.05
altair processAttestation - 250000 vs - 7PWei worstcase	44.836 ms/op	49.836 ms/op	0.90
altair processAttestation - setStatus - 1/6 committees join	10.133 ms/op	9.2231 ms/op	1.10
altair processAttestation - setStatus - 1/3 committees join	20.901 ms/op	19.229 ms/op	1.09
altair processAttestation - setStatus - 1/2 committees join	31.397 ms/op	30.076 ms/op	1.04
altair processAttestation - setStatus - 2/3 committees join	42.331 ms/op	38.832 ms/op	1.09
altair processAttestation - setStatus - 4/5 committees join	52.225 ms/op	46.583 ms/op	1.12
altair processAttestation - setStatus - 100% committees join	64.667 ms/op	60.434 ms/op	1.07
altair processAttestation - updateEpochParticipants - 1/6 committees join	10.200 ms/op	11.057 ms/op	0.92
altair processAttestation - updateEpochParticipants - 1/3 committees join	21.602 ms/op	20.515 ms/op	1.05
altair processAttestation - updateEpochParticipants - 1/2 committees join	28.101 ms/op	26.833 ms/op	1.05
altair processAttestation - updateEpochParticipants - 2/3 committees join	25.996 ms/op	30.417 ms/op	0.85
altair processAttestation - updateEpochParticipants - 4/5 committees join	27.708 ms/op	36.208 ms/op	0.77
altair processAttestation - updateEpochParticipants - 100% committees join	28.623 ms/op	33.007 ms/op	0.87
altair processAttestation - updateAllStatus	19.968 ms/op	23.259 ms/op	0.86
altair processBlock - 250000 vs - 7PWei normalcase	44.489 ms/op	50.736 ms/op	0.88
altair processBlock - 250000 vs - 7PWei worstcase	115.17 ms/op	129.45 ms/op	0.89
altair processEpoch - mainnet_e81889	940.45 ms/op	1.0621 s/op	0.89
mainnet_e81889 - altair beforeProcessEpoch	279.59 ms/op	300.45 ms/op	0.93
mainnet_e81889 - altair processJustificationAndFinalization	67.832 us/op	98.067 us/op	0.69
mainnet_e81889 - altair processInactivityUpdates	18.740 ms/op	20.676 ms/op	0.91
mainnet_e81889 - altair processRewardsAndPenalties	117.84 ms/op	137.34 ms/op	0.86
mainnet_e81889 - altair processRegistryUpdates	8.5680 us/op	14.329 us/op	0.60
mainnet_e81889 - altair processSlashings	1.5410 us/op	4.0250 us/op	0.38
mainnet_e81889 - altair processEth1DataReset	1.3450 us/op	4.3060 us/op	0.31
mainnet_e81889 - altair processEffectiveBalanceUpdates	11.344 ms/op	14.084 ms/op	0.81
mainnet_e81889 - altair processSlashingsReset	11.161 us/op	20.921 us/op	0.53
mainnet_e81889 - altair processRandaoMixesReset	14.295 us/op	28.819 us/op	0.50
mainnet_e81889 - altair processHistoricalRootsUpdate	1.9770 us/op	6.0430 us/op	0.33
mainnet_e81889 - altair processParticipationFlagUpdates	152.56 ms/op	173.29 ms/op	0.88
mainnet_e81889 - altair processSyncCommitteeUpdates	1.0830 us/op	3.3870 us/op	0.32
mainnet_e81889 - altair afterProcessEpoch	222.93 ms/op	256.51 ms/op	0.87
altair processInactivityUpdates - 250000 normalcase	65.638 ms/op	68.733 ms/op	0.95
altair processInactivityUpdates - 250000 worstcase	65.917 ms/op	67.792 ms/op	0.97
altair processParticipationFlagUpdates - 250000 anycase	88.980 ms/op	100.04 ms/op	0.89
altair processRewardsAndPenalties - 250000 normalcase	121.69 ms/op	133.35 ms/op	0.91
altair processRewardsAndPenalties - 250000 worstcase	136.96 ms/op	158.70 ms/op	0.86
altair processSyncCommitteeUpdates - 250000	362.24 ms/op	407.85 ms/op	0.89
Tree 40 250000 create	523.24 ms/op	495.65 ms/op	1.06
Tree 40 250000 get(125000)	331.36 ns/op	359.68 ns/op	0.92
Tree 40 250000 set(125000)	1.6701 us/op	1.5241 us/op	1.10
Tree 40 250000 toArray()	44.810 ms/op	40.594 ms/op	1.10
Tree 40 250000 iterate all - toArray() + loop	38.115 ms/op	41.094 ms/op	0.93
Tree 40 250000 iterate all - get(i)	118.18 ms/op	141.35 ms/op	0.84
MutableVector 250000 create	18.344 ms/op	23.963 ms/op	0.77
MutableVector 250000 get(125000)	13.545 ns/op	16.137 ns/op	0.84
MutableVector 250000 set(125000)	512.68 ns/op	534.45 ns/op	0.96
MutableVector 250000 toArray()	8.5248 ms/op	9.4279 ms/op	0.90
MutableVector 250000 iterate all - toArray() + loop	8.6065 ms/op	9.6559 ms/op	0.89
MutableVector 250000 iterate all - get(i)	3.4218 ms/op	4.1775 ms/op	0.82
Array 250000 create	5.2810 ms/op	6.7107 ms/op	0.79
Array 250000 clone - spread	1.8138 ms/op	2.0804 ms/op	0.87
Array 250000 get(125000)	0.89000 ns/op	1.0760 ns/op	0.83
Array 250000 set(125000)	0.89700 ns/op	1.0960 ns/op	0.82
Array 250000 iterate all - loop	168.64 us/op	196.63 us/op	0.86
aggregationBits - 2048 els - readonlyValues	211.02 us/op	244.15 us/op	0.86
aggregationBits - 2048 els - zipIndexesInBitList	37.661 us/op	47.607 us/op	0.79
regular array get 100000 times	67.399 us/op	77.979 us/op	0.86
wrappedArray get 100000 times	67.400 us/op	77.977 us/op	0.86
arrayWithProxy get 100000 times	29.023 ms/op	39.127 ms/op	0.74
ssz.Root.equals	1.1540 us/op	1.3300 us/op	0.87
ssz.Root.equals with valueOf()	1.3980 us/op	1.4600 us/op	0.96
byteArrayEquals with valueOf()	1.3060 us/op	1.4310 us/op	0.91
phase0 processBlock - 250000 vs - 7PWei normalcase	10.341 ms/op	11.294 ms/op	0.92
phase0 processBlock - 250000 vs - 7PWei worstcase	73.403 ms/op	77.743 ms/op	0.94
phase0 afterProcessEpoch - 250000 vs - 7PWei	225.36 ms/op	228.72 ms/op	0.99
phase0 beforeProcessEpoch - 250000 vs - 7PWei	581.29 ms/op	578.84 ms/op	1.00
phase0 processEpoch - mainnet_e58758	769.21 ms/op	857.33 ms/op	0.90
mainnet_e58758 - phase0 beforeProcessEpoch	471.59 ms/op	492.23 ms/op	0.96
mainnet_e58758 - phase0 processJustificationAndFinalization	55.139 us/op	95.980 us/op	0.57
mainnet_e58758 - phase0 processRewardsAndPenalties	82.199 ms/op	118.56 ms/op	0.69
mainnet_e58758 - phase0 processRegistryUpdates	37.085 us/op	60.104 us/op	0.62
mainnet_e58758 - phase0 processSlashings	1.2840 us/op	4.2750 us/op	0.30
mainnet_e58758 - phase0 processEth1DataReset	1.3260 us/op	2.9580 us/op	0.45
mainnet_e58758 - phase0 processEffectiveBalanceUpdates	9.0113 ms/op	10.839 ms/op	0.83
mainnet_e58758 - phase0 processSlashingsReset	7.3000 us/op	20.649 us/op	0.35
mainnet_e58758 - phase0 processRandaoMixesReset	11.462 us/op	24.249 us/op	0.47
mainnet_e58758 - phase0 processHistoricalRootsUpdate	1.5770 us/op	4.8520 us/op	0.33
mainnet_e58758 - phase0 processParticipationRecordUpdates	7.7640 us/op	14.376 us/op	0.54
mainnet_e58758 - phase0 afterProcessEpoch	208.31 ms/op	206.14 ms/op	1.01
phase0 processEffectiveBalanceUpdates - 250000 normalcase	11.213 ms/op	13.050 ms/op	0.86
phase0 processEffectiveBalanceUpdates - 250000 worstcase 0.5	1.2117 s/op	1.1730 s/op	1.03
phase0 processRegistryUpdates - 250000 normalcase	32.897 us/op	68.448 us/op	0.48
phase0 processRegistryUpdates - 250000 badcase_full_deposits	2.7564 ms/op	2.8266 ms/op	0.98
phase0 processRegistryUpdates - 250000 worstcase 0.5	1.4579 s/op	1.4963 s/op	0.97
phase0 getAttestationDeltas - 250000 normalcase	45.323 ms/op	44.373 ms/op	1.02
phase0 getAttestationDeltas - 250000 worstcase	38.514 ms/op	44.435 ms/op	0.87
phase0 processSlashings - 250000 worstcase	30.953 ms/op	33.289 ms/op	0.93
shuffle list - 16384 els	12.637 ms/op	14.968 ms/op	0.84
shuffle list - 250000 els	182.55 ms/op	208.02 ms/op	0.88
getEffectiveBalances - 250000 vs - 7PWei	12.611 ms/op	14.019 ms/op	0.90
computeDeltas	3.8868 ms/op	4.1180 ms/op	0.94
getPubkeys - index2pubkey - req 1000 vs - 250000 vc	2.5678 ms/op	2.2514 ms/op	1.14
getPubkeys - validatorsArr - req 1000 vs - 250000 vc	704.68 us/op	748.01 us/op	0.94
BLS verify - blst-native	1.8534 ms/op	2.1416 ms/op	0.87
BLS verifyMultipleSignatures 3 - blst-native	3.8043 ms/op	4.4207 ms/op	0.86
BLS verifyMultipleSignatures 8 - blst-native	8.2053 ms/op	9.5266 ms/op	0.86
BLS verifyMultipleSignatures 32 - blst-native	29.789 ms/op	34.725 ms/op	0.86
BLS aggregatePubkeys 32 - blst-native	40.011 us/op	46.169 us/op	0.87
BLS aggregatePubkeys 128 - blst-native	153.22 us/op	177.48 us/op	0.86
getAttestationsForBlock	82.313 ms/op	89.389 ms/op	0.92
CheckpointStateCache - add get delete	15.794 us/op	16.627 us/op	0.95
validate gossip signedAggregateAndProof - struct	4.4564 ms/op	5.0903 ms/op	0.88
validate gossip signedAggregateAndProof - treeBacked	4.4873 ms/op	4.9887 ms/op	0.90
validate gossip attestation - struct	2.0914 ms/op	2.3748 ms/op	0.88
validate gossip attestation - treeBacked	2.1102 ms/op	2.4131 ms/op	0.87
Object access 1 prop	0.35000 ns/op	0.37600 ns/op	0.93
Map access 1 prop	0.28600 ns/op	0.32500 ns/op	0.88
Object get x1000	17.355 ns/op	21.330 ns/op	0.81
Map get x1000	1.1040 ns/op	1.1270 ns/op	0.98
Object set x1000	113.69 ns/op	123.22 ns/op	0.92
Map set x1000	68.750 ns/op	74.572 ns/op	0.92
Return object 10000 times	0.37270 ns/op	0.42690 ns/op	0.87
Throw Error 10000 times	6.0599 us/op	6.7281 us/op	0.90

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