re2/benchlog/benchplot.py

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#!/usr/bin/env python
 
import argparse     # for ArgumentParser
import subprocess   # for Popen
import tempfile     # for NamedTemporaryFile
import os           # for remove
 
class gnuplot(object):
 
    output = "result.png"
 
    script = """
             set terminal png size 1024, 768
             set output "{}.png"
             set title "re2 benchlog"
             set datafile separator ";"
             set grid x y
             set ylabel "MB/s"
             set autoscale
             plot """
 
    template = """'{}' using 1:5:xticlabels(2) with linespoints linewidth 3 title "{}",\\\n"""
 
    benchdata = dict()
    tempfiles = []
 
    def __enter__(self):
        return self
 
    def __exit__(self, type, value, traceback):
        """
        remove all temporary files
        """
 
        for filename in self.tempfiles:
            os.remove(filename)
 
    def parse_re2_benchlog(self, filename):
        """
        parse the input benchlog and return a dictionary contain bench data
        """
 
        benchdata = self.benchdata
 
        with open(filename) as f:
 
            for raw in f.readlines():
 
                data = raw.split('\t')
 
                if len(data) == 4:
 
                    data = data[0].split('/') + data[1:]
                    data = list(map(str.strip, data))
 
                    if not benchdata.get(data[0]):
                        benchdata[data[0]] = [ data[1:] ]
                    else:
                        benchdata[data[0]].append(data[1:])
 
    def gen_csv(self):
        """
        generate temporary csv files
        """
 
        for name, data in self.benchdata.items():
 
            with tempfile.NamedTemporaryFile(delete=False) as f:
 
                for index, line in enumerate(data):
                    f.write('{};{}\n'.format(index, ';'.join(line)).encode())
 
                self.tempfiles.append(f.name)
                self.script = self.script + self.template.format(f.name, name)
 
    def run(self):
        self.gen_csv()
        script = self.script[:-3].format(self.output)
        command = subprocess.Popen(['gnuplot'], stdin=subprocess.PIPE)
        command.communicate(script.encode())
 
 
if __name__ == '__main__':
 
    parser = argparse.ArgumentParser(description='generate plots for benchlog')
    parser.add_argument('benchlog', type=str, help='benchlog generated by re2')
    args = parser.parse_args()
 
    try:
        subprocess.Popen(['gnuplot'], stdin=subprocess.PIPE)
    except FileNotFoundError:
        print('you can install "gnuplot" to generate plots automatically')
        exit(1)
 
    with gnuplot() as plot:
        plot.output = args.benchlog
        plot.parse_re2_benchlog(args.benchlog)
        plot.run()