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October 2, 2017 03:22
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import libvirt | |
import signal | |
import sys | |
import time | |
stats = [] | |
def signal_handler(signal, frame): | |
for stat in stats: | |
print(",".join("%.2f" % x for x in stat)) | |
sys.exit(0) | |
conn = libvirt.open('qemu:///system') | |
dom = conn.lookupByName("archlinux") | |
signal.signal(signal.SIGINT, signal_handler) | |
start_clock_time = clock_time = time.time() | |
host_stats = dom.getCPUStats(0) | |
total_stats = dom.getCPUStats(1)[0] | |
while True: | |
n_host_stats = dom.getCPUStats(0) | |
n_total_stats = dom.getCPUStats(1)[0] | |
n_clock_time = time.time() | |
elapsed_time = n_clock_time - clock_time | |
stat = [ | |
n_clock_time - start_clock_time, | |
min((n_total_stats['cpu_time'] - total_stats['cpu_time']) / elapsed_time * 1e-7, 200) | |
] | |
for i in range(len(host_stats)): | |
stat.append(min((n_host_stats[i]['cpu_time'] - host_stats[i]['cpu_time']) / elapsed_time * 1e-7, 100)) | |
stats.append(stat) | |
host_stats = n_host_stats | |
total_stats = n_total_stats | |
clock_time = n_clock_time | |
time.sleep(2e-1) |
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set xlabel 'seconds' | |
set ylabel 'CPU usage' | |
set grid | |
set term png giant | |
set output 'graph.png' | |
set datafile separator ',' | |
plot 'stats.csv' using 1:2 title 'VM' with lines,\ | |
'stats.csv' using 1:3 title 'CPU0' with lines,\ | |
'stats.csv' using 1:4 title 'CPU1' with lines,\ | |
'stats.csv' using 1:5 title 'CPU2' with lines,\ | |
'stats.csv' using 1:6 title 'CPU3' with lines,\ |
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