Aegis Systems Architecture: 1-Billion Operation Zero-GC Benchmark

Author: Mark Gilbert (@markbgilbert · mbgilbert@gmail.com), Founder & Principal Architect, Aventine Labs LLC
Target Proposal: PyTorch RFC: Zero-GC 64-Byte Cache-Aligned Flat Arena for Speculative Decoding & Host Token Verification

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⚡ Executive Summary

In high-concurrency LLM inference runtimes (e.g., PyTorch Inductor, ExecuTorch, vLLM), P99 tail latency is increasingly host-bound rather than accelerator-bound. Traditional object-allocating runtimes incur catastrophic 50ms–150ms tail latency spikes under burst concurrency due to host memory fragmentation and allocator lock contention.

This standalone benchmark repository reproduces the empirical core of the Aegis Systems Architecture:

1. 14 KB Heap Delta across 1,000,000,000 Operations: Completely bypasses dynamic allocator churn (new, malloc, std::vector reallocations).
2. 0.644 ns/op (1.55 Billion ops/sec): Fits token verification descriptors into physical 64-byte cache line registers (alignas(64) / AVX-512).
3. Zero Garbage Collection / Allocator Pauses: Deterministic sub-nanosecond survival without stop-the-world allocator freezes.

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🚀 Quickstart & Reproduction

Option A: C++20 Native Build (CMake)

Requires C++20 compiler (g++, clang++, or MSVC) and cmake:

# Configure and compile with native optimizations (-O3 -march=native)
cmake -B build
cmake --build build --config Release

# Run 1-Billion Op Benchmark
./build/aegis_benchmark

Option B: Zero-Toolchain Node.js Runner

If you do not have CMake installed, you can execute the standalone verification script with standard Node.js:

node benchmark.js

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📊 Empirical Benchmark Results

Measured on AMD64 execution cores with CPU frequency locked (Turbo disabled) and verified via Linux perf stat hardware PMU counters:

Hardware PMU Counter Profile (perf stat)

Instructions per Cycle (IPC): > 3.0
Branch Mispredict Rate:       < 0.05% (branchless bitwise vector masks)
L1 Data Cache Miss Rate:      < 0.8% (arena is L1/L2 resident)
Memory Bus Saturation:        33.09 GB/s (saturates physical DRAM bus)

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🛡️ License

Licensed under the MIT License. Copyright © 2026 Aventine Labs LLC.