NexusFIX
Ultra-low latency FIX protocol engine built with Modern C++23.
3x faster than QuickFIX with zero heap allocations on the hot path.
See NexusFIX in Action
From zero-copy parsing to SIMD-accelerated tag extraction — watch how NexusFIX processes FIX messages at sub-microsecond latency.
Performance at a Glance
Measured on Linux with GCC 13.3, 100,000 iterations.
Основные возможности
Built for ultra-low-latency financial messaging with modern C++ best practices.
Zero-Allocation Hot Path
Pre-allocated message pools and arena allocators eliminate GC pauses. Consistent sub-microsecond latency on the critical path.
AVX2 SIMD Tag Parsing
Vectorized FIX tag parsing processes 32 bytes per cycle. 3x throughput improvement over traditional byte-by-byte parsers.
Lock-Free Order Book
Wait-free concurrent order book with atomic operations. Supports millions of order updates per second without contention.
FIX 4.2 / 4.4 / 5.0
Full protocol coverage from FIX 4.2 to FIXT 1.1 / FIX 5.0 SP2. Session management, heartbeat, and sequence number recovery built-in.
Modern C++23
std::expected for error handling, std::span for zero-copy views, concepts for compile-time validation, consteval for compile-time computation.
io_uring Async I/O
DEFER_TASKRUN + registered buffers + multishot recv. 7-27% faster I/O with ~30% fewer syscalls than epoll.
How It Works
Accept & Parse
Incoming FIX messages are received via io_uring async I/O and parsed using SIMD-accelerated tag extraction into zero-copy message views.
Route & Match
Parsed messages flow through a rule-based routing engine to the lock-free order book for matching or forwarding to downstream venues.
Respond & Log
Execution reports are serialized from pre-allocated buffers and sent back with nanosecond-precision timestamps and persistent journaling.
Presented at C++Online 2026
NexusFIX was presented as an open-content poster at C++Online 2026, the premier virtual C++ conference.
Get Started with NexusFIX
MIT licensed. Drop-in replacement for QuickFIX with zero API friction.
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