Manual page for fiologparser_hist.py and Makefile updates to install
[fio.git] / tools / hist / half-bins.py
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KC
1#!/usr/bin/env python2.7
2""" Cut the number bins in half in fio histogram output. Example usage:
3
4 $ half-bins.py -c 2 output_clat_hist.1.log > smaller_clat_hist.1.log
5
6 Which merges e.g. bins [0 .. 3], [4 .. 7], ..., [1212 .. 1215] resulting in
7 304 = 1216 / (2**2) merged bins per histogram sample.
8
9 @author Karl Cronburg <karl.cronburg@gmail.com>
10"""
11import sys
12
13def main(ctx):
14 stride = 1 << ctx.coarseness
15 with open(ctx.FILENAME, 'r') as fp:
16 for line in fp.readlines():
17 vals = line.split(', ')
18 sys.stdout.write("%s, %s, %s, " % tuple(vals[:3]))
19
20 hist = list(map(int, vals[3:]))
21 for i in range(0, len(hist) - stride, stride):
22 sys.stdout.write("%d, " % sum(hist[i : i + stride],))
23 sys.stdout.write("%d\n" % sum(hist[len(hist) - stride:]))
24
25if __name__ == '__main__':
26 import argparse
27 p = argparse.ArgumentParser()
28 arg = p.add_argument
29 arg( 'FILENAME', help='clat_hist file for which we will reduce'
30 ' (by half or more) the number of bins.')
31 arg('-c', '--coarseness',
32 default=1,
33 type=int,
34 help='number of times to reduce number of bins by half, '
35 'e.g. coarseness of 4 merges each 2^4 = 16 consecutive '
36 'bins.')
37 main(p.parse_args())
38