Update benchmarking for diffusers

Signed-off-by: ajrasane <[email protected]>

Author: ajrasane

examples/diffusers/quantization/diffusion_trt.py

@@ -47,6 +47,7 @@
 }
 
 
+@torch.inference_mode()
 def generate_image(pipe, prompt, image_name):
     seed = 42
     image = pipe(
@@ -59,56 +60,52 @@ def generate_image(pipe, prompt, image_name):
     print(f"Image generated saved as {image_name}")
 
 
-def benchmark_model(
-    pipe, prompt, num_warmup=10, num_runs=50, num_inference_steps=20, model_dtype="Half"
+@torch.inference_mode()
+def benchmark_backbone_standalone(
+    pipe, num_warmup=10, num_benchmark=100, model_name="flux-dev", model_dtype="Half"
 ):
-    """Benchmark the backbone model inference time."""
+    """Benchmark the backbone model directly without running the full pipeline."""
     backbone = pipe.transformer if hasattr(pipe, "transformer") else pipe.unet
 
-    backbone_times = []
+    # Generate dummy inputs for the backbone
+    dummy_inputs, _, _ = generate_dummy_inputs_and_dynamic_axes_and_shapes(model_name, backbone)
+
+    # Extract the dict from the tuple and move to cuda
+    dummy_inputs_dict = {
+        k: v.cuda() if isinstance(v, torch.Tensor) else v for k, v in dummy_inputs[0].items()
+    }
+
+    # Warmup
+    print(f"Warming up: {num_warmup} iterations")
+    for _ in tqdm(range(num_warmup), desc="Warmup"):
+        _ = backbone(**dummy_inputs_dict)
+
+    # Benchmark
+    torch.cuda.synchronize()
     start_event = torch.cuda.Event(enable_timing=True)
     end_event = torch.cuda.Event(enable_timing=True)
 
-    def forward_pre_hook(_module, _input):
+    print(f"Benchmarking: {num_benchmark} iterations")
+    times = []
+    for _ in tqdm(range(num_benchmark), desc="Benchmark"):
         start_event.record()
-
-    def forward_hook(_module, _input, _output):
+        _ = backbone(**dummy_inputs_dict)
         end_event.record()
         torch.cuda.synchronize()
-        backbone_times.append(start_event.elapsed_time(end_event))
-
-    pre_handle = backbone.register_forward_pre_hook(forward_pre_hook)
-    post_handle = backbone.register_forward_hook(forward_hook)
-
-    try:
-        print(f"Starting warmup: {num_warmup} runs")
-        for _ in tqdm(range(num_warmup), desc="Warmup"):
-            with torch.amp.autocast("cuda", dtype=dtype_map[model_dtype]):
-                _ = pipe(
-                    prompt,
-                    output_type="pil",
-                    num_inference_steps=num_inference_steps,
-                    generator=torch.Generator("cuda").manual_seed(42),
-                )
-
-        backbone_times.clear()
-
-        print(f"Starting benchmark: {num_runs} runs")
-        for _ in tqdm(range(num_runs), desc="Benchmark"):
-            with torch.amp.autocast("cuda", dtype=dtype_map[model_dtype]):
-                _ = pipe(
-                    prompt,
-                    output_type="pil",
-                    num_inference_steps=num_inference_steps,
-                    generator=torch.Generator("cuda").manual_seed(42),
-                )
-    finally:
-        pre_handle.remove()
-        post_handle.remove()
-
-    total_backbone_time = sum(backbone_times)
-    avg_latency = total_backbone_time / (num_runs * num_inference_steps)
-    print(f"Inference latency of the torch backbone: {avg_latency:.2f} ms")
+        times.append(start_event.elapsed_time(end_event))
+
+    avg_latency = sum(times) / len(times)
+    times = sorted(times)
+    p50 = times[len(times) // 2]
+    p95 = times[int(len(times) * 0.95)]
+    p99 = times[int(len(times) * 0.99)]
+
+    print(f"\nBackbone-only inference latency ({model_dtype}):")
+    print(f"  Average: {avg_latency:.2f} ms")
+    print(f"  P50: {p50:.2f} ms")
+    print(f"  P95: {p95:.2f} ms")
+    print(f"  P99: {p99:.2f} ms")
+
     return avg_latency
 
 
@@ -203,7 +200,13 @@ def main():
         pipe.to("cuda")
 
         if args.benchmark:
-            benchmark_model(pipe, args.prompt, model_dtype=args.model_dtype)
+            benchmark_backbone_standalone(
+                pipe,
+                num_warmup=10,
+                num_benchmark=100,
+                model_name=args.model,
+                model_dtype=args.model_dtype,
+            )
 
         if not args.skip_image:
             generate_image(pipe, args.prompt, image_name)