Project Panama: Achieving Zero-Garbage-Collection Vector Search

In large-scale JVM applications, Garbage Collection (GC) pauses are a notorious performance bottleneck. If you store millions of floating-point arrays representing vector embeddings on the heap, the GC must scan them, causing latency spikes.

Spector eliminates this overhead by leveraging Java's Project Panama FFM (Foreign Function & Memory) API.

Off-Heap Memory Layouts

Spector allocates memory outside the JVM heap using native MemorySegment buffers:

JVM Heap (Metadata) <---> Panama FFM Layer <---> Off-Heap Memory Segment (Vectors)

By storing the raw float coordinates in off-heap segments, the garbage collector never scans them. Vector similarity is calculated by passing these segment addresses directly to native SIMD instructions, ensuring sub-millisecond search latencies with zero GC impact.