Universal Runner Operator Guide

The quanux_runner is the core C++ execution engine for QuanuX. Use this skill to execute strategies, run backtests, or deploy to live markets.

1. Capabilities

•Offline Replay: High-performance replay of Databento .dbn files (MBO/L3 supported).
•Rithmic Replay: Historical tick replay via RApi+ (Trade info).
•Live Trading: Direct connection to Databento Live API via libdatabento or Rithmic RApi+.
•Zero-Copy Execution: Loads strategies as shared objects (.dylib/.so) for maximum speed.

2. Usage

Location

Binary is located at: execution-node/cpp/build/quanux_runner

CLI Arguments

Argument	Required	Description
`--strategy <path>`	Yes	Path to the compiled strategy shared object (`.dylib`/`.so`).
`--file <path>`	No*	Path to input `.dbn` file (Offline Mode). Required for Backtesting.
`--key <key>`	No*	Databento API Key. Required for Live Mode.
`--symbol <sym>`	No	Symbol to subscribe to (default: `ES`).
`--dataset <ds>`	No	Dataset (default: `GLBX.MDP3`).
`--ruser <u>`	No*	Rithmic Username. Required for Rithmic.
`--rpass <p>`	No*	Rithmic Password. Required for Rithmic.
`--rexch <e>`	No	Rithmic Exchange (e.g., `CME`). Required for Rithmic.
`--start <ts>`	No	Start Timestamp (Unix Epoch). Required for Replay.
`--end <ts>`	No	End Timestamp (Unix Epoch). Required for Replay.

Examples

A. Run Offline Backtest (Recommended)

Use this to verify strategy logic using historical data. Zstd decompression is handled automatically if the runner was linked correctly.

bash

./execution-node/cpp/build/quanux_runner \
    --strategy execution-node/cpp/build/demo_strategy.dylib \
    --file data/raw/glbx-mdp3-20260122.mbo.dbn

B. Run Live Mode

Requires DATABENTO_API_KEY (env var or arg).

bash

export DATABENTO_API_KEY=db-xc...
./execution-node/cpp/build/quanux_runner \
    --strategy execution-node/cpp/build/demo_strategy.dylib \
    --symbol ESH6

C. Run Rithmic Replay

Replay historical trades from Rithmic servers.

bash

./execution-node/cpp/build/quanux_runner \
    --strategy execution-node/cpp/build/demo_strategy.dylib \
    --ruser "DEMO_USER" \
    --rpass "DEMO_PASS" \
    --symbol "ES.M24" \
    --rexch "CME" \
    --start 1715000000 \
    --end 1715003600

3. Workflow Checklist

Before running, ensure:

•
Strategy Built: The strategy must be compiled freshly.
- •cmake --build execution-node/cpp/build --target <strategy_name>
•
Runner Built: The host binary must be up to date.
- •cmake --build execution-node/cpp/build --target quanux_runner
•Data Ready: For offline mode, ensure the .dbn file exists and is readable.

4. Troubleshooting

•
Exit Code 139 (Segfault):
- •Usually means the strategy is crashing (e.g., indicator out of bounds).
- •Fix: Add std::cout logs to on_market_data in the strategy and rebuild to isolate the crash.
•
"Symbol not found":
- •The strategy .dylib is missing symbols or ABI mismatch.
- •Fix: Ensure extern "C" { Strategy* create_strategy() ... } is strictly defined in the strategy source.
•
"Invalid argument 'key'":
- •API Key is missing or invalid in Live Mode.