diff options
Diffstat (limited to 'src/benchmarks/falsesharing.py')
| -rw-r--r-- | src/benchmarks/falsesharing.py | 36 |
1 files changed, 20 insertions, 16 deletions
diff --git a/src/benchmarks/falsesharing.py b/src/benchmarks/falsesharing.py index 85d0a92..203aeb8 100644 --- a/src/benchmarks/falsesharing.py +++ b/src/benchmarks/falsesharing.py @@ -1,32 +1,36 @@ +"""Definition of the falsesahring benchmark""" + +import re + 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.$") +TIME_RE = re.compile("^Time elapsed = (?P<time>\\d*\\.\\d*) seconds.$") + + +class BenchmarkFalsesharing(Benchmark): + """Falsesharing benchmark. + 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. + """ -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.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") + result["time"] = TIME_RE.match(stdout).group("time") def summary(self): # Speedup thrash @@ -40,13 +44,13 @@ class Benchmark_Falsesharing(Benchmark): 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 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]] + data = [float(m["time"]) for m in self.results[allocator][perm]] - y_vals.append(single_threaded / np.mean(d)) + y_vals.append(single_threaded / np.mean(data)) plt.plot(nthreads, y_vals, marker='.', linestyle='-', label=allocator, color=allocators[allocator]["color"]) @@ -71,4 +75,4 @@ class Benchmark_Falsesharing(Benchmark): fixed=["bench"]) -falsesharing = Benchmark_Falsesharing() +falsesharing = BenchmarkFalsesharing() |