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import os
import stat
from executable import Executable
class FTcat(Executable):
'''Used to wrap the ftcat binary in the Experiment object.'''
def __init__(self, ft_cat_bin, stdout_file, stderr_file, dev, events, cpu=None):
'''Extends the Executable initializer method with ftcat attributes.'''
# hack to run FTCat at higher priority
chrt_bin = '/usr/bin/chrt'
super(FTcat, self).__init__(chrt_bin)
self.stdout_file = stdout_file
self.stderr_file = stderr_file
mode = os.stat(dev)[stat.ST_MODE]
if not mode & stat.S_IFCHR:
raise Exception("%s is not a character device" % dev)
if events is None:
raise Exception('No events!')
# hack to run FTCat at higher priority
self.extra_args = ['-f', '40']
if cpu is not None:
# and bind it to a CPU
self.extra_args.extend(['/usr/bin/taskset', '-c', str(cpu)])
events_str_arr = map(str, events)
self.extra_args.extend([ft_cat_bin, dev] + events_str_arr)
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