def collect_cpu(cgroup_name, percentile):
"""
Collect the average CPU utilization over a minute period
"""
percentages = []
for x in range(0, 60):
cgroup_stats_dir = os.path.join(CGROUP_DIR, cgroup_name)
cpu_stats = helpers.parse_fk(open(os.path.join(cgroup_stats_dir, 'cpu.stat'), 'r').read())
cpu_usage = helpers.parse_nlsv(open(os.path.join(cgroup_stats_dir, 'cpuacct.usage'), 'r').read())
cpu_quota = helpers.parse_nlsv(open(os.path.join(cgroup_stats_dir, 'cpu.cfs_quota_us'), 'r').read())
cpu_stat_nr_periods_curr = cpu_stats['nr_periods']
cpuacct_usage_curr_in_ns = cpu_usage[0]
cpu_cfs_quota_in_us = cpu_quota[0]
global cpu_stat_nr_periods_prev
global cpuacct_usage_prev_in_ns
num_periods_elapsed = cpu_stat_nr_periods_curr - cpu_stat_nr_periods_prev
cpuacct_usage_diff_in_ns = cpuacct_usage_curr_in_ns - cpuacct_usage_prev_in_ns
max_allowed_cpu_time_in_us = num_periods_elapsed * cpu_cfs_quota_in_us
cpu_stat_nr_periods_prev = cpu_stat_nr_periods_curr
cpuacct_usage_prev_in_ns = cpuacct_usage_curr_in_ns
cpu_usage_percentage = 0
try:
cpu_usage_percentage = 100.0 * cpuacct_usage_diff_in_ns / (max_allowed_cpu_time_in_us * 1000)
except ZeroDivisionError:
pass
# TODO by attendees: Add the percentage to a list
time.sleep(1)
# TODO by attendees: Calculate the percentile using numpy
return None
def collect_cpu(cgroup_name):
"""
Collect the average CPU utilization over a minute period
"""
cgroup_stats_dir = os.path.join(CGROUP_DIR, cgroup_name)
cpu_stats = helpers.parse_fk(open(os.path.join(cgroup_stats_dir, 'cpu.stat'), 'r').read())
global cpu_stat_nr_throttle_prev
global cpu_stat_throttled_time_prev
cpu_stat_nr_throttle_curr = cpu_stats['nr_throttled']
cpu_stat_throttled_time_curr = cpu_stats['throttled_time']
# TODO by attendees: Calculate the number of throttles since the last measurement time
# TODO by attendees: Calculate the amount of time the cgroup is throttled (in ms) since the last measurement time
return cpu_stat_nr_throttle, cpu_stat_throttled_time
def collect_cpu(cgroup_name):
"""
Collect the average CPU utilization over a minute period
"""
cgroup_stats_dir = os.path.join(CGROUP_DIR, cgroup_name)
cpu_stats = helpers.parse_fk(open(os.path.join(cgroup_stats_dir, 'cpu.stat'), 'r').read())
cpu_usage = helpers.parse_nlsv(open(os.path.join(cgroup_stats_dir, 'cpuacct.usage'), 'r').read())
cpu_quota = helpers.parse_nlsv(open(os.path.join(cgroup_stats_dir, 'cpu.cfs_quota_us'), 'r').read())
cpu_stat_nr_periods_curr = cpu_stats['nr_periods']
cpuacct_usage_curr_in_ns = cpu_usage[0]
cpu_cfs_quota_in_us = cpu_quota[0]
# TODO by attendee: Calculate the CPU utilization. Use the algorithm in the exercise document
global cpu_stat_nr_periods_prev
global cpuacct_usage_prev_in_ns
cpu_stat_nr_periods_prev = cpu_stat_nr_periods_curr
cpuacct_usage_prev_in_ns = cpuacct_usage_curr_in_ns
cpu_usage_percentage = 0