From 420883139db40f77d5325a290111de1ffa7bc7d3 Mon Sep 17 00:00:00 2001
From: David Wehr <dawehr@iastate.edu>
Date: Fri, 3 Mar 2017 01:48:08 -0600
Subject: [PATCH] Switched WiFi timing script to perf_counter and enabled
TCP_NODELAY
---
wifi_bridge/test_scripts/tcp_timer.py | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)
diff --git a/wifi_bridge/test_scripts/tcp_timer.py b/wifi_bridge/test_scripts/tcp_timer.py
index 29bcbe2df..78664a980 100644
--- a/wifi_bridge/test_scripts/tcp_timer.py
+++ b/wifi_bridge/test_scripts/tcp_timer.py
@@ -8,7 +8,7 @@ TCP_PORT = 8080
# sock.bind(('', UDP_PORT))
-message = bytes(range(32))
+message = bytes(range(36))
times_full = []
times_network = []
times = [0.0]*100
@@ -19,6 +19,7 @@ recvd_data = []
for i in range(100):
if dropped:
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+ sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
sock.settimeout(2)
sock.connect((TCP_IP, TCP_PORT))
dropped = False
@@ -26,9 +27,8 @@ for i in range(100):
send_msg[0] = i
send_msg = bytes(send_msg)
- send_time = time.clock()
+ send_time = time.perf_counter()
times[i] = send_time
- # send_time = time.clock()
sock.send(send_msg)
try:
response = sock.recv(1024)
@@ -36,10 +36,10 @@ for i in range(100):
except:
print("timed out")
dropped = True
- if len(recvd_data) >= 32:
- end_time = time.clock()
- response = bytes(recvd_data[0:32])
- recvd_data = recvd_data[32:]
+ if len(recvd_data) >= 36:
+ end_time = time.perf_counter()
+ response = bytes(recvd_data[0:36])
+ recvd_data = recvd_data[36:]
msg_id = int(response[0])
latency = end_time - times[msg_id]
# serial_time = int.from_bytes(response[0:4], byteorder='big') / 1000
@@ -48,7 +48,8 @@ for i in range(100):
times_full.append(1000 * latency)
times_network.append(1000 * (end_time - send_time) - serial_time)
print("received " + str(response) + " in " + str(times_full[-1]) + " from " + str(addr))
- time.sleep(0.1)
+ while time.perf_counter() - send_time < 0.01:
+ pass
# with open("tcp_dist.csv", 'w', newline='') as f:
# writer = csv.writer(f)
--
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