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1import os
2from autotest_lib.client.bin import test, utils
3
4
5class hackbench(test.test):
6    """
7    This module will run the hackbench benchmark. Hackbench is a benchmark for
8    measuring the performance, overhead and scalability of the Linux scheduler.
9    The C program was pick from Ingo Molnar's page.
10
11    @author: Nikhil Rao (ncrao@google.com)
12    @see: http://people.redhat.com/~mingo/cfs-scheduler/tools/hackbench.c
13    """
14    version = 1
15    preserve_srcdir = True
16
17
18    def setup(self):
19        os.chdir(self.srcdir)
20        if 'CC' in os.environ:
21            cc = '$CC'
22        else:
23            cc = 'cc'
24        utils.system('%s -lpthread hackbench.c -o hackbench' % cc)
25
26
27    def initialize(self):
28        self.job.require_gcc()
29        self.results = None
30
31
32    def run_once(self, num_groups=90):
33        """
34        Run hackbench, store the output in raw output files per iteration and
35        also in the results list attribute.
36
37        @param num_groups: Number of children processes hackbench will spawn.
38        """
39        hackbench_bin = os.path.join(self.srcdir, 'hackbench')
40        cmd = '%s %s' % (hackbench_bin, num_groups)
41        raw_output = utils.system_output(cmd, retain_output=True)
42        self.results = raw_output
43
44        path = os.path.join(self.resultsdir, 'raw_output_%s' % self.iteration)
45        utils.open_write_close(path, raw_output)
46
47
48    def postprocess_iteration(self):
49        """
50        Pick up the results attribute and write it in the performance keyval.
51        """
52        lines = self.results.split('\n')
53        for line in lines:
54            if line.startswith('Time:'):
55                time_val = line.split()[1]
56                self.write_perf_keyval({'time': time_val})
57