From 25c4d81069f576354d0279bf38417c236e924540 Mon Sep 17 00:00:00 2001
From: Florian Fischer <florian.fl.fischer@fau.de>
Date: Mon, 25 Mar 2019 17:49:39 +0100
Subject: move benchmark definitions into src/benchmarks

bench now loads all *.py files from src/benchmarks as benchmarks
---
 src/benchmarks/falsesharing.py | 74 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 src/benchmarks/falsesharing.py

(limited to 'src/benchmarks/falsesharing.py')

diff --git a/src/benchmarks/falsesharing.py b/src/benchmarks/falsesharing.py
new file mode 100644
index 0000000..f6375a6
--- /dev/null
+++ b/src/benchmarks/falsesharing.py
@@ -0,0 +1,74 @@
+import matplotlib.pyplot as plt
+import numpy as np
+import re
+
+from src.benchmark import Benchmark
+
+time_re = re.compile("^Time elapsed = (?P<time>\d*\.\d*) seconds.$")
+
+
+class Benchmark_Falsesharing(Benchmark):
+    def __init__(self):
+        self.name = "falsesharing"
+        self.descrition = """This benchmarks makes small allocations and writes
+                             to them multiple times. If the allocated objects
+                             are on the same cache line the writes will be
+                             expensive because of cache thrashing."""
+
+        self.cmd = "cache-{bench}{binary_suffix} {threads} 100 8 1000000"
+
+        self.args = {
+                        "bench": ["thrash", "scratch"],
+                        "threads": Benchmark.scale_threads_for_cpus(2)
+                    }
+
+        self.requirements = ["cache-thrash", "cache-scratch"]
+        super().__init__()
+
+    def process_output(self, result, stdout, stderr, allocator, perm, verbose):
+        result["time"] = time_re.match(stdout).group("time")
+
+    def summary(self):
+        # Speedup thrash
+        args = self.results["args"]
+        nthreads = args["threads"]
+        allocators = self.results["allocators"]
+
+        for bench in self.results["args"]["bench"]:
+            for allocator in allocators:
+                y_vals = []
+
+                single_threaded_perm = self.Perm(bench=bench, threads=1)
+                single_threaded = np.mean([float(m["time"])
+                                          for m in self.results[allocator][single_threaded_perm]])
+
+                for perm in self.iterate_args_fixed({"bench": bench}, args=args):
+
+                    d = [float(m["time"]) for m in self.results[allocator][perm]]
+
+                    y_vals.append(single_threaded / np.mean(d))
+
+                plt.plot(nthreads, y_vals, marker='.', linestyle='-',
+                         label=allocator, color=allocators[allocator]["color"])
+
+            plt.legend()
+            plt.xlabel("threads")
+            plt.ylabel("speedup")
+            plt.title(bench + " speedup")
+            plt.savefig(self.name + "." + bench + ".png")
+            plt.clf()
+
+        self.plot_fixed_arg("({L1-dcache-load-misses}/{L1-dcache-loads})*100",
+                            ylabel="'l1 cache misses in %'",
+                            title="'cache misses: ' + arg + ' ' + str(arg_value)",
+                            filepostfix="l1-misses",
+                            fixed=["bench"])
+
+        self.plot_fixed_arg("({LLC-load-misses}/{LLC-loads})*100",
+                            ylabel="'l1 cache misses in %'",
+                            title="'LLC misses: ' + arg + ' ' + str(arg_value)",
+                            filepostfix="llc-misses",
+                            fixed=["bench"])
+
+
+falsesharing = Benchmark_Falsesharing()
-- 
cgit v1.2.3