llama.cpp+ZenDNN on EPYC 9755 128c: Qwen3.5-4B None prefill tok/s (512in/128seq)
2307.04 tok/s prefill (llama-batched-bench pp512, 128 parallel seq, aggregate)
Fields
id
benchmarks/amd-epyc9755-zendnn-qwen35-4b-bf16-pp512Metric
prefill_tok_s
Value
2,307.04
Unit
tok/s prefill (llama-batched-bench pp512, 128 parallel seq, aggregate)
Model
Qwen3.5-4B
Methodology
VENDOR MEASURED (AMD developer blog, ZD-066/067, Aug 18 2026). AMD EPYC 9755 128-core single socket (one NUMA node pinned, SMT off, 4.06GHz boost, DDR5-6400 12-ch); llama.cpp build b9326, ZenDNN 5.2.2 backend (-DGGML_ZENDNN=ON), ZENDNNL_MATMUL_ALGO=AOCL-DLP, llama-batched-bench 512in/128out/128 parallel seq, flash-attn on, KV cache = model precision, 3-run mean. Qwen3.5-4B (BF16): ZenDNN 2307.04 vs native-CPU 1209.53 tok/s prefill. AGGREGATE over 128 seq, not per-request.
Measured by
vendor
Reproducible
yes
notes
Native-CPU baseline 1209.53 tok/s -> ZenDNN 2307.04 tok/s (1.91x). Vendor-published, single-socket pinned. Decode falls back to CPU path on ZenDNN 5.2.2 (small-batch not yet accelerated).
Notes
Native-CPU baseline 1209.53 tok/s -> ZenDNN 2307.04 tok/s (1.91x). Vendor-published, single-socket pinned. Decode falls back to CPU path on ZenDNN 5.2.2 (small-batch not yet accelerated).