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#!/usr/bin/python
from timeit import default_timer as timer
import statistics
import subprocess
import sys
if len(sys.argv) <= 3:
print("usage: ping-ssh <host> <repeat count> <string>")
sys.exit(1)
host = sys.argv[1]
repeat = int(sys.argv[2])
ping_string = sys.argv[3]
def ping(stdin, stdout):
ping_bytes = (ping_string+"\n").encode()
stdin.write(ping_bytes)
result = stdout.read(len(ping_bytes))
assert result == ping_bytes
proc = subprocess.Popen(['ssh', host, 'cat'],
bufsize=0,
stdout=subprocess.PIPE, stdin=subprocess.PIPE)
# ping once to ensure the "connection" is ready. Without this the first ping
# would be much slower than all others due to ssh/cat starting up
ping(proc.stdin, proc.stdout)
times = []
for i in range(repeat):
start = timer()
ping(proc.stdin, proc.stdout)
end = timer()
time = end - start
times.append(time)
print("{:.5f}ms".format(time * 1000))
print("")
print("mean: {:.5f}ms".format(statistics.mean(times) * 1000))
print("median: {:.5f}ms".format(statistics.median(times) * 1000))
print("min: {:.5f}ms".format(min(times) * 1000))
print("max: {:.5f}ms".format(max(times) * 1000))
proc.stdin.close()
proc.wait()
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