=== libevent-0001: evhttp_dispatch_callback O(C) per request → O(1) with URI hash map ===
N=100   k=100  : defective=0.093ms  fixed=0.004ms  speedup=26.5x
N=500   k=500  : defective=2.232ms  fixed=0.021ms  speedup=105.4x
N=1000  k=1000 : defective=9.028ms  fixed=0.049ms  speedup=183.5x
N=2000  k=2000 : defective=35.987ms  fixed=0.097ms  speedup=370.0x

