azat · October 27, 2024 14:47 · Oct 27, 2024
diff --git a/libevent-hashsocket.py b/libevent-hashsocket.py
@@ -0,0 +1,63 @@
+#!/usr/bin/env python3
+
+import matplotlib.pyplot as plt
+
+
+def hashsocket_1(fd):
+    return fd
+
+
+def hashsocket_2(fd):
+    h = fd & 0xffffffff
+    h += (h >> 2) & 0xffffffff | (h << 30) & 0xffffffff
+    return h
+
+
+def hashsocket_3(fd):
+    h = fd & 0xffffffff
+    h = (h >> 2) & 0xffffffff | (h << 30) & 0xffffffff
+    return h
+
+
+n1_values = []
+n2_values = []
+n3_values = []
+
+prime = 49157
+for s in range(0, int(prime*1.2), 4):
+    h1 = hashsocket_1(s)
+    h2 = hashsocket_2(s)
+    h3 = hashsocket_3(s)
+
+    n1 = h1 % prime
+    n2 = h2 % prime
+    n3 = h3 % prime
+
+    n1_values.append(n1)
+    n2_values.append(n2)
+    n3_values.append(n3)
+
+# Set up subplots for a clear comparison
+fig, axes = plt.subplots(3, 1, figsize=(10, 12))
+
+# Plot n1 distribution
+axes[0].hist(n1_values, bins=100, color="skyblue", edgecolor="black")
+axes[0].set_title("fd % prime")
+axes[0].set_xlabel("Value")
+axes[0].set_ylabel("Frequency")
+
+# Plot n2 distribution
+axes[1].hist(n2_values, bins=100, color="salmon", edgecolor="black")
+axes[1].set_title("hashsocket orig % prime")
+axes[1].set_xlabel("Value")
+axes[1].set_ylabel("Frequency")
+
+# Plot n3 distribution
+axes[2].hist(n3_values, bins=100, color="lightgreen", edgecolor="black")
+axes[2].set_title("hashsocket patched % prime")
+axes[2].set_xlabel("Value")
+axes[2].set_ylabel("Frequency")
+
+# Adjust layout and show plot
+plt.tight_layout()
+plt.show()