counterdiff.py

#!/usr/bin/env python
# counterdiff.py < plog program ..      (or general perf arguments)
# verify plog.* output from toplev by running event one by one
# this can be used to estimate multiplexing measurement errors
from __future__ import print_function
import sys, os

def run(x):
    print(x)
    os.system(x)

for l in sys.stdin:
    if l.find(",") < 0:
        continue
    n = l.strip().split(",")
    run("perf stat --output l -x, -e %s %s" %
        (n[1], " ".join(sys.argv[1:])))
    f = open("l", "r")
    for i in f:
        if i.find(",") < 0:
            continue
        j = i.strip().split(",")
        break
    f.close()
    if float(n[0]) > 0:
        delta = (float(j[0]) - float(n[0])) / float(n[0])
    else:
        delta = 0
    print(n[1], j[0], n[0], "%.2f" % (delta * 100.0))