57 lines
1.7 KiB
Python
57 lines
1.7 KiB
Python
import os
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from autotest_lib.client.bin import test, utils
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class hackbench(test.test):
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"""
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This module will run the hackbench benchmark. Hackbench is a benchmark for
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measuring the performance, overhead and scalability of the Linux scheduler.
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The C program was pick from Ingo Molnar's page.
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@author: Nikhil Rao (ncrao@google.com)
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@see: http://people.redhat.com/~mingo/cfs-scheduler/tools/hackbench.c
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"""
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version = 1
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preserve_srcdir = True
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def setup(self):
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os.chdir(self.srcdir)
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if 'CC' in os.environ:
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cc = '$CC'
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else:
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cc = 'cc'
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utils.system('%s -lpthread hackbench.c -o hackbench' % cc)
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def initialize(self):
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self.job.require_gcc()
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self.results = None
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def run_once(self, num_groups=90):
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"""
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Run hackbench, store the output in raw output files per iteration and
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also in the results list attribute.
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@param num_groups: Number of children processes hackbench will spawn.
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"""
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hackbench_bin = os.path.join(self.srcdir, 'hackbench')
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cmd = '%s %s' % (hackbench_bin, num_groups)
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raw_output = utils.system_output(cmd, retain_output=True)
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self.results = raw_output
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path = os.path.join(self.resultsdir, 'raw_output_%s' % self.iteration)
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utils.open_write_close(path, raw_output)
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def postprocess_iteration(self):
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"""
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Pick up the results attribute and write it in the performance keyval.
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"""
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lines = self.results.split('\n')
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for line in lines:
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if line.startswith('Time:'):
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time_val = line.split()[1]
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self.write_perf_keyval({'time': time_val})
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