benchmarks: report collection serialization timings in ns

Author: mykaul

benchmarks/bench_collection_serialize.py

@@ -61,9 +61,9 @@ def run_bench(label, fn, args, n):
     for _ in range(min(1000, n)):
         fn(*args)
     t = timeit.timeit(lambda: fn(*args), number=n)
-    us_per_call = t / n * 1e6
-    print(f"  {label:45s} {t:.3f}s  ({us_per_call:.2f} us/call)")
-    return t, us_per_call
+    ns_per_call = t / n * 1e9
+    print(f"  {label:45s} {t:.3f}s  ({ns_per_call:.2f} ns/call)")
+    return t, ns_per_call
 
 
 # Test data
@@ -132,6 +132,6 @@ def run_bench(label, fn, args, n):
 
 # Print summary for easy comparison
 print(f"\n{'=' * 70}")
-print("Summary (us/call):")
+print("Summary (ns/call):")
 for k, v in results.items():
-    print(f"  {k:25s}: {v:.2f} us")
+    print(f"  {k:25s}: {v:.2f} ns")