chore: add benchmarking script

scripts/benchmark.py

@@ -0,0 +1,156 @@
+# Run as python3 scripts/benchmark.py from the repository root directory.
+
+import sys
+from math import floor, log
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).parent.parent))
+
+import tarfile
+from io import BytesIO
+from test.utils import Variant, metadata, target
+from urllib.error import HTTPError
+from urllib.request import urlopen
+
+VERSIONS = ("3.0.0", "3.1.0", "3.2.0", "3.3.0", "dev")
+SCENARIOS = [
+    *[
+        (
+            f"Wall time [sampling interval: {i}]",
+            ["-Pi", str(i), sys.executable, target("target34.py")],
+        )
+        for i in (1, 10, 100, 1000)
+    ],
+    *[
+        (
+            f"CPU time [sampling interval: {i}]",
+            ["-Psi", str(i), sys.executable, target("target34.py")],
+        )
+        for i in (1, 10, 100, 1000)
+    ],
+]
+
+
+def get_stats(output: str) -> dict:
+    meta = metadata(output)
+    raw_saturation = meta["saturation"]
+    _, _, raw_samples = raw_saturation.partition("/")
+
+    duration = float(meta["duration"]) / 1e6
+    samples = int(raw_samples)
+    saturation = eval(raw_saturation)
+    error_rate = eval(meta["errors"])
+    sampling = int(meta["sampling"].split(",")[1])
+
+    return {
+        "Sample Rate": samples / duration,
+        "Saturation": saturation,
+        "Error Rate": error_rate,
+        "Sampling Speed": sampling,
+    }
+
+
+def download_release(version: str, dest: Path) -> Variant:
+    if version == "dev":
+        return Variant("src/austin")
+
+    binary_dest = dest / version
+    binary = binary_dest / "austin"
+
+    if not binary.exists():
+        prefix = "https://github.com/p403n1x87/austin/releases/download/"
+        for variant in {"-gnu", ""}:
+            try:
+                with urlopen(
+                    f"{prefix}v{version}/austin-{version}{variant}-linux-amd64.tar.xz"
+                ) as stream:
+                    buffer = BytesIO(stream.read())
+                    binary_dest.mkdir(parents=True, exist_ok=True)
+                    tar = tarfile.open(fileobj=buffer, mode="r:xz")
+                    tar.extract("austin", str(binary_dest))
+            except HTTPError:
+                continue
+            break
+        else:
+            raise RuntimeError(f"Could not download Austin version {version}")
+
+    variant = Variant(str(binary))
+
+    assert f"austin {version}" in variant("-V").stdout
+
+    return variant
+
+
+class Outcome:
+    def __init__(self, data: list[float]) -> None:
+        self.mean = sum(data) / len(data)
+        self.stdev = (
+            sum(((v - self.mean) ** 2 for v in data)) / (len(data) - 1)
+        ) ** 0.5
+
+    def __repr__(self):
+        n = -floor(log(self.stdev, 10)) if self.stdev else 0
+        rmean = round(self.mean, n)
+        rstdev = round(self.stdev, n)
+        if n <= 0:
+            rmean = int(rmean)
+            rstdev = int(rstdev)
+
+        return f"{rmean} ± {rstdev}"
+
+    __str__ = __repr__
+
+    def __len__(self):
+        return len(repr(self))
+
+
+def render(table):
+    _, row = table[0]
+    cols = list(row.keys())
+    max_vh = max(len(e[0]) for e in table)
+
+    col_widths = [max(max(len(r[col]), len(col)) for _, r in table) for col in cols]
+    div_len = sum(col_widths) + (len(cols) + 1) * 2 + max_vh
+
+    print("=" * div_len)
+    print(
+        (" " * (max_vh + 2))
+        + "".join(f"{col:^{cw+2}}" for col, cw in zip(cols, col_widths))
+    )
+    print("-" * div_len)
+
+    for v, row in table:
+        print(f"{v:^{max_vh+2}}", end="")
+        for col, cw in zip(cols, col_widths):
+            print(f"{str(row[col]):^{cw+2}}", end="")
+        print()
+
+    print("=" * div_len)
+
+
+print(
+    f"Running Austin benchmarks with Python {'.'.join(str(_) for _ in sys.version_info)}",
+    end="\n\n",
+)
+
+for title, args in SCENARIOS:
+    print(title)
+
+    table = []
+    for version in VERSIONS:
+        print(f"> Running with Austin {version} ...    ", end="\r")
+        austin = download_release(version, Path("/tmp"))
+
+        stats = [get_stats(austin(*args).stdout) for _ in range(10)]
+        table.append(
+            (
+                version,
+                {
+                    key: Outcome([s[key] for s in stats])
+                    for key in list(stats[0].keys())
+                },
+            )
+        )
+
+    render(table)
+    print()