"Primbon-driven scheduling for the spiritually aligned"
A fully functional sched_ext scheduler that makes real CPU scheduling decisions based on the Javanese Weton calendar system, including pasaran cycles, neptu calculations, and traditional primbon divination. This actually loads into the Linux kernel and schedules your system tasks. Because if the ancient Javanese calendar can determine auspicious dates for weddings, why not CPU scheduling too?
- Weton Calendar Calculation: Uses the 35-day selapanan cycle combining 7-day saptawara with 5-day pasaran
- Pasaran-Based Task Classification: Tasks are classified by their ruling pasaran (Legi, Pahing, Pon, Wage, Kliwon)
- Pancasuda Cycle: Daily fortune modifier from Sri/Lungguh/Dunya/Lara/Pati - with Pati triggering 50% time slice penalty
- Neptu Fate Compatibility: Jodoh neptu system for task-day compatibility (Pesthi, Pegat, Ratu, Jodoh, etc.)
- Lunar Phase Scheduling: Moon phases (Purnama/Tilem) affect task energy from traditional primbon
- Jam Jawa Time Periods: Eight traditional Javanese time divisions affect scheduling throughout the day
- Weton Weather Reports: Get real-time weton guidance with today's pasaran, pancasuda, lunar phase, and jam jawa
- Actually Works: Loads into the Linux kernel via sched_ext and schedules real system processes
- Real BPF Integration: Uses scx_rustland_core framework for kernel-userspace communication
- Dynamic Time Slicing: Adjusts CPU time based on weton-derived priority (100-1000)
Each pasaran rules specific types of system tasks based on directional and elemental qualities:
| Task Type | Ruling Pasaran | Direction | Element | Rationale |
|---|---|---|---|---|
| Interactive | Legi | East (Wetan) | Wood/Air | Rising energy, user-facing |
| CPU-Intensive | Pahing | South (Kidul) | Fire | Intensity, raw power |
| System | Pon | West (Kulon) | Metal | Balance, stability |
| Memory | Wage | North (Lor) | Water | Grounding, depth |
| Network/I/O | Kliwon | Center (Tengah) | Earth | Connecting, bridging |
| Desktop | Legi | East (Wetan) | Wood/Air | User-facing, light |
| Critical | (all) | - | - | High base priority |
When today's pasaran matches a task's ruling pasaran:
- Legi (Wood/Air) boosts Interactive & Desktop tasks: 1.5x
- Pahing (Fire) boosts CPU-intensive tasks: 1.5x
- Pon (Metal) boosts System tasks: 1.5x
- Wage (Water) boosts Memory tasks: 1.5x
- Kliwon (Earth) boosts Network tasks: 1.5x
Non-matching pasaran combinations are neutral (1.0x).
Based on the total neptu (day + pasaran) modulo 5:
| Pancasuda | Multiplier | Effect |
|---|---|---|
| Sri | 1.3x | Prosperity, abundance |
| Lungguh | 1.2x | Honorable status |
| Dunya | 1.4x | Worldly fortune (best!) |
| Lara | 0.8x | Temporary obstacles |
| Pati | 0.5x | Endings, worst day (50% time slice penalty) |
Traditional primbon compatibility using (weton_neptu + task_neptu) % 8:
| Fate | Multiplier | Meaning |
|---|---|---|
| Ratu | 1.5x | Royalty, success (best) |
| Pesthi | 1.4x | Harmony, peace |
| Tinari | 1.4x | Abundance |
| Jodoh | 1.3x | Connection |
| Topo | 1.0x | Discipline |
| Sujanan | 0.9x | Uncertainty |
| Padu | 0.8x | Conflict |
| Pegat | 0.7x | Disruption (worst) |
final_priority = base_priority x pasaran_match x fate_modifier x pancasuda_modifier x lunar_modifier x jam_modifier
time_slice = min_slice + (base_slice - min_slice) x (priority / 1000)
if pancasuda == Pati: time_slice x 0.5
Base Priorities:
- Critical (PID 1): 1000
- System tasks: 200
- Interactive tasks: 150
- Desktop/UI: 120
- CPU/Network: 100
- Memory: 80
NOTE: userspace schedulers require kernels 6.12 or later.
cargo build --releaseIf you're using NixOS, you can also add provided flake like this (25.11+ required):
# Include this flake
inputs.scx_weton.url = "github:zampierilucas/scx_weton";
...
# Include module
outputs = { self, nixpkgs, scx_weton, ... }@inputs: {
nixosConfigurations.myhost = nixpkgs.lib.nixosSystem {
modules = [
scx_weton.nixosModules.default
];
};
};And then somewhere later in your system configuration:
services.scx_weton = {
enable = true;
# Add options as needed
extraArgs = [ "--cosmic-weather" ];
};Requires root privileges to load into the kernel as a sched_ext scheduler.
# Build
cargo build --release
# Run with weton weather report and verbose output
sudo target/release/scx_weton --cosmic-weather -v
# Run with debug decisions to see individual task scheduling
sudo target/release/scx_weton --debug-decisions
# Stop: Press Ctrl+C for graceful shutdownWeton Options:
-w, --cosmic-weather- Display today's weton, pancasuda, lunar phase, and jam jawa on startup-d, --debug-decisions- Watch weton-based scheduling decisions in real-time--no-pati- Disable Pati penalty (removes 50% time slice reduction on Pati days)-u, --update-interval <SECS>- Update weton calculations every N seconds (default: 60)
Performance Tuning:
-s, --slice-us <MICROSECONDS>- Base time slice duration (default: 5000)--slice-us-min <MICROSECONDS>- Minimum time slice (default: 500)-v, --verbose- Display detailed statistics
Run --help to see all options.
Date: February 3, 2026 (Tuesday/Selasa) at 10:30 AM
Today's weton: Selasa Legi (neptu = 3 + 5 = 8)
- Pancasuda: 8 % 5 = 3 = Dunya (1.4x - best day!)
- Lunar phase: Waxing Gibbous (1.3x)
- Jam Jawa: Gumatel (1.3x base)
Interactive task (bash, ruled by Legi):
Pasaran match: Legi = Legi -> 1.5x
Fate: (8 + 5) % 8 = 5 -> Tinari (1.4x)
Pancasuda: Dunya (1.4x)
Lunar: 1.3x
Jam: Gumatel (1.4x with peak adjustment)
final_priority = 150 x 1.5 x 1.4 x 1.4 x 1.3 x 1.4 = 810 -> EXTREMELY BOOSTED
CPU task (rustc, ruled by Pahing):
Pasaran match: Legi != Pahing -> 1.0x
Fate: (8 + 9) % 8 = 1 -> Pegat (0.7x)
Pancasuda: Dunya (1.4x)
Lunar: 1.3x
Jam: Gumatel (1.5x with CPU peak adjustment)
final_priority = 100 x 1.0 x 0.7 x 1.4 x 1.3 x 1.5 = 191 -> BOOSTED despite bad fate
This scheduler is 100% for educational and entertainment purposes. While the weton calculations are based on authentic Javanese primbon tradition and the scheduler actually works (it really does load into the kernel and schedule tasks!), using Javanese calendar cycles to schedule CPU tasks is:
- Culturally fascinating but not scientifically validated for computing
- Cosmically hilarious
- Fully functional with real pancasuda, neptu fate, and lunar phase calculations
- Not recommended for production systems (but it boots and runs stably)
- Perfect for conference talks, hackathons, and proving that anything is possible
GPL-2.0-only (as required by sched_ext)
Contributions welcome! The core scheduler is working, but there's always room for more cosmic chaos:
- Add more pancasuda modifiers and neptu fate interactions
- Process weton generation based on creation time (like birth charts)
- Primbon predictions for task completion times
- Weton compatibility (jodoh neptu) between parent and child processes
- Extend jam jawa effects with more granular time periods
- Add pawukon 210-day cycle integration
- Norm for the hilarious and brilliant idea to schedule by the stars (now the calendar)
- sched_ext team for the amazing BPF scheduler framework
- The Javanese primbon tradition for millennia of calendrical wisdom
- Karjanto & Beauducel for their academic work on Javanese calendar algorithms
"Eling lan waspada." (Be mindful and aware.)
Comments from people:
- "You've made it work, but at what cost!"