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Add --smooth option, which will collect X samples (one per --interval… #49

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Add --smooth option, which will collect X samples (one per --interval… #49

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31 changes: 28 additions & 3 deletions psrecord/main.py
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,7 @@
absolute_import)

import time
import statistics
import argparse


Expand Down Expand Up @@ -84,6 +85,11 @@ def main():
'seconds). By default the process is sampled '
'as often as possible.')

parser.add_argument('--smooth', type=int,
help='when plotting, take the average of X samples ('
'as defined by --interval) to increase the '
'smoothness of the graph')

parser.add_argument('--include-children',
help='include sub-processes in statistics (results '
'in a slower maximum sampling rate).',
Expand All @@ -105,14 +111,15 @@ def main():
pid = sprocess.pid

monitor(pid, logfile=args.log, plot=args.plot, duration=args.duration,
interval=args.interval, include_children=args.include_children)
interval=args.interval, smooth=args.smooth,
include_children=args.include_children)

if sprocess is not None:
sprocess.kill()


def monitor(pid, logfile=None, plot=None, duration=None, interval=None,
include_children=False):
smooth=None, include_children=False):

# We import psutil here so that the module can be imported even if psutil
# is not present (for example if accessing the version)
Expand All @@ -138,6 +145,9 @@ def monitor(pid, logfile=None, plot=None, duration=None, interval=None,
log['mem_real'] = []
log['mem_virtual'] = []

# Used when `--smooth` is in effect.
samples = []

try:

# Start main event loop
Expand Down Expand Up @@ -183,6 +193,21 @@ def monitor(pid, logfile=None, plot=None, duration=None, interval=None,
current_mem_real += current_mem.rss / 1024. ** 2
current_mem_virtual += current_mem.vms / 1024. ** 2

if smooth:
samples.append((current_cpu, current_mem_real, current_mem_virtual))
if len(samples) < smooth:
# Don't plot/log yet, wait for a completed sample window.
if interval is not None:
time.sleep(interval)
continue

if smooth:
# Calculate the average of all the samples in our window.
current_cpu = statistics.mean([s[0] for s in samples])
current_mem_real = statistics.mean([s[1] for s in samples])
current_mem_virtual = statistics.mean([s[2] for s in samples])
samples[:] = []

if logfile:
f.write("{0:12.3f} {1:12.3f} {2:12.3f} {3:12.3f}\n".format(
current_time - start_time,
Expand All @@ -191,7 +216,7 @@ def monitor(pid, logfile=None, plot=None, duration=None, interval=None,
current_mem_virtual))
f.flush()

if interval is not None:
if not smooth and interval is not None:
time.sleep(interval)

# If plotting, record the values
Expand Down