Sepals

Sepals is a experimental optimization mod for minecraft server, aims to minimize latency in game-ticking simultaneously keeping the vanilla features unchanged.

Installation

Sepals needs fabric-api, and Sepals will always following the newest version of Minecraft, please ensure you are installed any version of fabric, fabric-api and the Minecraft that matched to Sepals required version.

Issues

Sepals is not very stable well, a lots of potential bugs is not not yet found.

So please report all not vanilla behaviors to sepals's github issues that was happening, and could attach a spark profiler result, thanks!

Compatibility

Currently, sepals are compatible to almost all mods (If not new issues opened).

Here is verified mod list:

Target mod	Target mod version	Recommend target version	Sepals version	Recommend sepals version
sodium	all	all	all	latest
iris	all	all	all	latest
ferritecore	all	all	all	latest
krypton	all	all	all	latest
lithium	>=0.14.1	latest	>=1.0.4	latest
c2me-fabric	>=0.3.0+alpha.0.295	latest	>=1.0.5	latest
moonrise-opt	>=0.1.0-beta8	unknown	>=1.0.6	latest

If you don't know which version to choose, please use the latest version of all the optimization mods, Sepals will ensure compatibility with them.

Performance

Sepals has been tested on Intel i7-14700K, 4G RAM for java, Minecraft 1.21, there are 800 frogs cramming in a 7x7 space:

Biased long jump task

Environment	keepRunning	Percent(Avg.)
Vanilla (LongJumpTask)	43.1 ms	100 %
With Lithium (LongJumpTask)	7.5 ms	17 %
With Sepals (SepalsLongJumpTask)	0.2 ms	0.4 %
With Sepals+Lithium (SepalsLongJumpTask)	0.05 ms	0.1 %

Environment	getTarget	Percent(Avg.)	Percent(in keepRunning)
Vanilla (LongJumpTask)	43.1 ms	100 %	100 %
With Lithium (LongJumpTask)	3.6 ms	9 %	48 %
With Sepals (SepalsLongJumpTask)	N/A ms	0 %	0 %
With Sepals+Lithium (SepalsLongJumpTask)	N/A ms	0 %	0 %

Quick sort in NearestLivingEntitiesSensor

Environment	sort (NearestLivingEntitiesSensor#sense)	Percent(Avg.)
Vanilla	3.8 ms	100 %
With Lithium	3.6 ms	94 %
With Sepals	2.2 ms	57 %
With Sepals+Lithium	2.2 ms	57 %

Frog attackable target filter

Environment	time	Percent(Avg.)
Vanilla (FrogAttackablesSensor#matches)	10 ms	100 %
With Lithium (FrogAttackablesSensor#matches)	5.7 ms	57 %
With Sepals (SepalsFrogBrain#attackable)	0.1 ms	1 %
With Sepals+Lithium (SepalsFrogBrain#attackable)	0.1 ms	1 %

Frog look-at target filter

Environment	findFirst	Percent
Vanilla (LookAtMobWithIntervalTask$$Lambda#findFirst)	2.7 ms	100 %
With Lithium (LookAtMobWithIntervalTask$$Lambda#findFirst)	2.5 ms	92 %
With Sepals (SepalsLookAtMobWithIntervalTask$$Lambda#findFirstPlayer)	0.1 ms	3 %
With Sepals+Lithium (SepalsLookAtMobWithIntervalTask$$Lambda#findFirstPlayer)	0.1 ms	3 %

and 800 villagers cramming in a 7x7 space:

Villager miscellaneous optimizations

at noon:

Environment	Brain#tick (Total)	Percent	Brain#startTasks	Percent(startTasks)	Brain#tickSensors	Percent(tickSensors)	Brain#updateTasks	Percent(updateTasks)	Brain#tickMemories	Percent(tickMemories)
Vanilla	18 ms	100 %	9.3 ms	100 %	5.2 ms	100 %	3 ms	100 %	0.5 ms	100 %
With lithium	12.4 ms	68 %	4.8 ms	51 %	5.9 ms	113 %	1.2 ms	40 %	0.5 ms	100 %
With Sepals	9.7 ms	53 %	3.6 ms	38 %	3.7 ms	71 %	2 ms	66 %	0.4 ms	80 %
With Sepals and lithium	10 ms	55 %	3.4 ms	36 %	3.7 ms	71 %	2.5 ms	83 %	0.4 ms	80 %

at night:

Environment	Brain#tick (Total)	Percent	Brain#startTasks	Percent(startTasks)	Brain#tickSensors	Percent(tickSensors)	Brain#updateTasks	Percent(updateTasks)	Brain#tickMemories	Percent(tickMemories)
Vanilla	16.7 ms	100 %	8.2 ms	100 %	6 ms	100 %	2 ms	100 %	0.5 ms	100 %
With lithium	10.2 ms	61 %	3.2 ms	24 %	6 ms	113 %	0.5 ms	25 %	0.5 ms	100 %
With Sepals	9 ms	53 %	3.3 ms	16 %	4.7 ms	78 %	0.7 ms	35 %	0.3 ms	60 %
With Sepals and lithium	8.7 ms	52 %	2.9 ms	11 %	4.6 ms	76 %	0.7 ms	35 %	0.5 ms	100 %

and 1390 villagers cramming in a 7x7 space:

Entities cramming

Environment	tickCramming	Percent(Avg.)
Vanilla	53.6 ms	100 %
With Lithium	54.4 ms	101 %
With Sepals	10.2 ms	19 %
With Sepals+Lithium	8.5 ms	15 %

What was it doing

1. Used Catheter to replaced java stream, The newest version Catheter has more quite stunning performance and scalability than Stream
2. Cached tasks, activities, running tasks and memories to improves starting and updating task
3. Use sepals composite task to replaced vanilla composite task
4. Whenever possible, find opportunities to skips more raycast and useless predicates
5. Use 'SepalsLivingTargetCache' to replaced vanilla cache, At the cost in sensors tick make less cost in finding interaction target or look at mob task
6. Rearranged predicates and extra lower cost predicate, The purpose of this is do higher cost predicate later or best don't do that, Skip the remaining high cost predicates in advance
7. Copied and modified 'SerializingRegionBasedStorage' optimizations from lithium
8. With more targeted task, don't use the generics to reduce useless operations
9. Used binary search list to replaced hashset search
10. Use quick sort (fastutil) to replaced tim sort (java std)
11. Precalculate and cache any useful data, avoid unnecessary repetitive calculations
12. Do more cache, space for time

Notes

1. Sepals just try to minimizing the game-ticking latency, it won't help with network latency!
2. Sepals are currently not extensive long-term testing, occur bugs it is possible
3. Only fabric, no forge, no quilt, and no other any modloader supported