client/tests/tsc/tsc.py

import os, re, logging
from autotest_lib.client.bin import test, utils
from autotest_lib.client.common_lib import error

class tsc(test.test):
    version = 2

    preserve_srcdir = True

    def setup(self):
        os.chdir(self.srcdir)
        utils.system('make')


    def initialize(self):
        self.job.require_gcc()


    def run_once(self, args = '-t 650'):
        result = utils.run(self.srcdir + '/checktsc ' + args,
                           ignore_status=True)
        if result.exit_status != 0:
            logging.error('Program checktsc exit status is %s',
                          result.exit_status)
            default_reason = ("UNKNOWN FAILURE: rc=%d from %s" %
                              (result.exit_status, result.command))
            ## Analyze result.stdout to see if it is possible to form qualified
            ## reason of failure and to raise an appropriate exception.
            ## For this test we qualify the reason of failure if the 
            ## following conditions are met:
            ## (i) result.exit_status = 1
            ## (ii) result.stdout ends with 'FAIL'
            ## (iii) "FAIL" is preceeded by one or more
            ##       lines in the following format:
            ##       CPU x - CPU y = <delta>
            ## Set as a reason the line that contains max abs(delta)
            if result.exit_status == 1:
                if result.stdout.strip('\n').endswith('FAIL'):
                    ## find all lines
                    ## CPU x - CPU y = <delta>
                    ## and parse out delta of max abs value
                    max_delta = 0
                    reason = ''
                    threshold = int(args.split()[1])
                    latencies = re.findall("CPU \d+ - CPU \d+ =\s+-*\d+",
                                           result.stdout)
                    for ln in latencies:
                        cur_delta = int(ln.split('=', 2)[1])
                        if abs(cur_delta) > max_delta:
                            max_delta = abs(cur_delta)
                            reason = ln
                    if max_delta > threshold:
                        reason = "Latency %s exceeds threshold %d" % (reason,
                                                                      threshold)
                        raise error.TestFail(reason)

            ## If we are here, we failed to qualify the reason of test failre
            ## Consider it as a test error
            raise error.TestError(default_reason)