feat(a/b): add support scripts for A/B visualization

Add scripts for combining and plotting results of A/B runs.
Move all A/B related scripts to the tools/ab

Signed-off-by: Egor Lazarchuk <[email protected]>

tools/ab/combine.py

@@ -0,0 +1,45 @@
+import argparse
+import json
+import os
+from pathlib import Path
+
+parser = argparse.ArgumentParser(
+    description="Combine A/B test fails into groups per test type"
+)
+parser.add_argument(
+    "path",
+    help="Path to the directory with failed A/B runs",
+    type=Path,
+)
+args = parser.parse_args()
+
+BLOCK = "test_block_performance"
+NET_THROUGHPUT = "test_network_throughput"
+NET_LATENCY = "test_network_latency"
+
+block_data = []
+net_data = []
+net_lat_data = []
+for d in os.walk(args.path):
+    if "ab.json" in d[-1]:
+        path = d[0] + "/ab.json"
+        print(path)
+        with open(path, "r+") as f:
+            lines = f.read()
+            j = '{"data":' + lines + "}"
+            data = json.loads(j)
+            for e in data["data"]:
+                match e["performance_test"]:
+                    case BLOCk:
+                        block_data.append(e)
+                    case NET_THROUGHPUT:
+                        net_data.append(e)
+                    case NET_LATENCY:
+                        net_lat_data.append(e)
+
+with open(f"{NET_LATENCY}.json", "w") as f:
+    json.dump({"results": net_lat_data}, f, indent=2, sort_keys=True)
+with open(f"{NET_THROUGHPUT}.json", "w") as f:
+    json.dump({"results": net_data}, f, indent=2, sort_keys=True)
+with open(f"{BLOCK}.json", "w") as f:
+    json.dump({"fails": block_data}, f, indent=2, sort_keys=True)

tools/ab/plot.py

@@ -0,0 +1,138 @@
+import argparse
+import json
+import os
+from enum import Enum
+
+import matplotlib.pyplot as plt
+import numpy as np
+
+plt.style.use("dark_background")
+
+
+def clamp(min_v, max_v, v):
+    return max(min_v, min(max_v, v))
+
+
+def lerp(color_a, color_b, t):
+    return (
+        clamp(0.0, 1.0, abs(color_a[0] * (1.0 - t) + color_b[0] * t)),
+        clamp(0.0, 1.0, abs(color_a[1] * (1.0 - t) + color_b[1] * t)),
+        clamp(0.0, 1.0, abs(color_a[2] * (1.0 - t) + color_b[2] * t)),
+    )
+
+
+GREY = (0.5, 0.5, 0.5)
+GREEN = (0.1, 0.8, 0.1)
+RED = (0.8, 0.0, 0.1)
+
+POSITIVE_COLOR = GREEN
+NEGATIVE_COLOR = RED
+
+
+class DataType(Enum):
+    Block = "block"
+    Net = "net"
+    NetLatency = "net_latency"
+
+
+parser = argparse.ArgumentParser(description="Plot results of A/B test")
+parser.add_argument("path", type=str)
+args = parser.parse_args()
+
+paths = [f"{args.path}/{f}" for f in os.listdir(args.path)]
+for path in paths:
+    print(f"processing: {path}")
+    with open(path) as f:
+        fails = json.load(f)["fails"]
+
+    if not fails:
+        print(f"skipping {path}. No data present")
+        continue
+
+    instances = set()
+    host_kernels = set()
+    aggregated = {}
+
+    match fails[0]["performance_test"]:
+        case "test_block_performance":
+            data_type = DataType.Block
+        case "test_network_tcp_throughput":
+            data_type = DataType.Net
+        case "test_network_latency":
+            data_type = DataType.NetLatency
+        case _:
+            print("unknown data type. skipping")
+            continue
+
+    for fail in fails:
+        instances.add(fail["instance"])
+        host_kernels.add(fail["host_kernel"])
+
+        if data_type == DataType.Block:
+            tag = (
+                fail["instance"],
+                fail["host_kernel"],
+                fail["guest_kernel"],
+                fail["fio_mode"],
+                fail["vcpus"],
+                fail["io_engine"],
+            )
+        elif data_type == DataType.Net:
+            tag = (
+                fail["instance"],
+                fail["host_kernel"],
+                fail["guest_kernel"],
+                fail["mode"],
+                fail["vcpus"],
+            )
+        elif data_type == DataType.NetLatency:
+            tag = (
+                fail["instance"],
+                fail["host_kernel"],
+                fail["guest_kernel"],
+            )
+            POSITIVE_COLOR = RED
+            NEGATIVE_COLOR = GREEN
+
+        if tag not in aggregated:
+            aggregated[tag] = []
+        aggregated[tag].append(fail["diff"])
+
+    for instance in sorted(instances):
+        fig, ax = plt.subplots(len(host_kernels), figsize=(16, 11))
+        if len(host_kernels) == 1:
+            ax = [ax]
+        fig.tight_layout(pad=8.0)
+
+        for i, host_kernel in enumerate(sorted(host_kernels)):
+            data = []
+            for key, value in aggregated.items():
+                if key[0] == instance and key[1] == host_kernel:
+                    label = "\n".join(key[2:])
+                    values = np.array(value)
+                    mean = np.mean(values)
+                    std = np.std(values)
+                    data.append((label, mean, std))
+            data.sort()
+            labels = np.array([t[0] for t in data])
+            means = np.array([t[1] for t in data])
+            errors = np.array([t[2] for t in data])
+            colors = [
+                (
+                    lerp(GREY, POSITIVE_COLOR, t)
+                    if 0.0 < t
+                    else lerp(GREY, NEGATIVE_COLOR, -t)
+                )
+                for t in [m / 100.0 for m in means]
+            ]
+
+            bar = ax[i].bar(labels, means, yerr=errors, color=colors, ecolor="white")
+            bar_labels = [f"{m:.2f} / {s:.2f}" for (m, s) in zip(means, errors)]
+            ax[i].bar_label(bar, labels=bar_labels)
+            ax[i].set_ylabel("Percentage of change: mean / std")
+            ax[i].grid(color="grey", linestyle="-.", linewidth=0.5, alpha=0.5)
+            ax[i].set_title(
+                f"{data_type}\nInstance: {instance}\nHost kernel: {host_kernel}",
+            )
+
+        plt.savefig(f"{args.path}/{data_type}_{instance}.png")

tools/devtool

@@ -760,7 +760,7 @@ cmd_test() {
     test_script="./tools/test.sh"
 
     if [ $do_ab_test -eq 1 ]; then
-      test_script="./tools/ab_test.py"
+      test_script="./tools/ab/ab_test.py"
     fi
 
     # Testing (running Firecracker via the jailer) needs root access,