- html - 出于某种原因,IE8 对我的 Sass 文件中继承的 html5 CSS 不友好?
- JMeter 在响应断言中使用 span 标签的问题
- html - 在 :hover and :active? 上具有不同效果的 CSS 动画
- html - 相对于居中的 html 内容固定的 CSS 重复背景?
我正在尝试创建一种使用UNIX域套接字在多个进程之间进行通信以传输数据的方法。有2个程序(progserv.py和progclient.py),每个程序都有N个线程(此示例有4个),每个线程在另一个进程上与相应的线程通信。 progclient.py发送datetime.datetime对象的“挑剔”形式。 progserv.py接收数据并确定通信延迟。这里的想法是找到进程间数据传输中的通信延迟。
我面临的问题是,随着N值的增加,延迟从不到1毫秒增加到有时超过250毫秒。延迟时间不一致,并且波动很大。
progserv.py代码:
import string
import random
import threading
import time
import os
import traceback
import socket
import pickle
from datetime import datetime
def worker(num):
addr = './tmp'+str(num)
logstr = "SERVER"+str(num)+":"
if os.path.exists(addr):
os.unlink(addr)
try:
msock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM, 0)
msock.bind(addr)
msock.listen(1)
sock,_ = msock.accept()
sock.setblocking(0)
msock.close()
except:
print (logstr,"Error opening the socket for listening.Trace:", traceback.format_exc())
return
print (logstr,"Socket connection with client done")
buf=list()
count=1
while True:
try:
data = sock.recv(1500)
if len(data)<=0:
print (logstr,"Peer end probably closed down the connection")
break
else:
try:
d=(datetime.now()-pickle.loads(data)).total_seconds()*1000
buf.append((count,d))
count+=1
#print (logstr,"Received ",str(count-1),"packets")
except:
pass
except socket.error:
if len(buf)>0:
c,data=buf.pop(0)
print (logstr,"COUNTER=",c," DELTA=",data,"msec")
except:
print (logstr,"Exception in receiving data. Trace:", traceback.format_exc())
break
if isinstance(sock, socket.socket):
sock.close()
if isinstance(msock, socket.socket):
msock.close()
def main():
server_count=5
threads=list()
for i in range(server_count):
t=threading.Thread(target=worker, args=(i,))
threads.append(t)
t.start()
print ("MAIN: Started thread index",i)
time.sleep(0.1)
for t in threads:
t.join()
if __name__=='__main__':
main()
import traceback, os, time, random, socket
import threading, pickle
from datetime import datetime
def worker(num):
addr = './tmp'+str(num)
logstr="CLIENT"+str(num)+":"
try:
sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM, 0)
sock.connect(addr)
sock.setblocking(0)
except:
print (logstr,"Error opening the socket for connection. Trace:", traceback.format_exc())
return
while True:
try:
d=datetime.now()
bytes=sock.send(pickle.dumps(d))
if bytes<=0:
print (logstr,"Peer end probably closed down the connection")
break
else:
print (logstr,"Sent",bytes,"bytes")
except socket.error:
pass
except:
print (logstr,"Exception during sending. Trace:", traceback.format_exc())
break
time.sleep(1)
if isinstance(sock, socket.socket):
sock.close()
def main():
client_count=5
threads=list()
for i in range(client_count):
t=threading.Thread(target=worker, args=(i,))
threads.append(t)
t.start()
print ("CLIENT : Started thread index",i)
time.sleep(0.1)
for t in threads:
t.join()
if __name__=='__main__':
main()
MAIN: Started thread index 0
MAIN: Started thread index 1
MAIN: Started thread index 2
MAIN: Started thread index 3
MAIN: Started thread index 4
SERVER0: Socket connection with client done
SERVER0: COUNTER= 1 DELTA= 0.7969999999999999 msec
SERVER1: Socket connection with client done
SERVER1: COUNTER= 1 DELTA= 0.28200000000000003 msec
SERVER2: Socket connection with client done
SERVER3: Socket connection with client done
SERVER2: COUNTER= 1 DELTA= 258.839 msec
SERVER4: Socket connection with client done
SERVER3: COUNTER= 1 DELTA= 238.006 msec
SERVER4: COUNTER= 1 DELTA= 477.099 msec
SERVER0: COUNTER= 2 DELTA= 0.175 msec
SERVER2: COUNTER= 2 DELTA= 0.174 msec
SERVER1: COUNTER= 2 DELTA= 108.28 msec
SERVER4: COUNTER= 2 DELTA= 35.966 msec
SERVER3: COUNTER= 2 DELTA= 146.63899999999998 msec
SERVER1: COUNTER= 3 DELTA= 76.92 msec
SERVER2: COUNTER= 3 DELTA= 116.096 msec
SERVER0: COUNTER= 3 DELTA= 317.726 msec
SERVER3: COUNTER= 3 DELTA= 15.792 msec
SERVER4: COUNTER= 3 DELTA= 294.577 msec
SERVER0: COUNTER= 4 DELTA= 6.123 msec
SERVER1: COUNTER= 4 DELTA= 95.69999999999999 msec
SERVER2: COUNTER= 4 DELTA= 0.434 msec
SERVER4: COUNTER= 4 DELTA= 63.32599999999999 msec
SERVER3: COUNTER= 4 DELTA= 322.351 msec
SERVER0: COUNTER= 5 DELTA= 185.03300000000002 msec
SERVER1: COUNTER= 5 DELTA= 84.869 msec
SERVER2: COUNTER= 5 DELTA= 33.532 msec
SERVER3: COUNTER= 5 DELTA= 101.01400000000001 msec
SERVER4: COUNTER= 5 DELTA= 152.035 msec
SERVER0: COUNTER= 6 DELTA= 33.533 msec
SERVER2: COUNTER= 6 DELTA= 0.501 msec
SERVER1: COUNTER= 6 DELTA= 101.59400000000001 msec
SERVER3: COUNTER= 6 DELTA= 91.584 msec
SERVER4: COUNTER= 6 DELTA= 32.779999999999994 msec
SERVER1: COUNTER= 7 DELTA= 42.009 msec
SERVER0: COUNTER= 7 DELTA= 142.716 msec
SERVER2: COUNTER= 7 DELTA= 137.214 msec
SERVER3: COUNTER= 7 DELTA= 124.629 msec
SERVER4: COUNTER= 7 DELTA= 190.025 msec
SERVER0: COUNTER= 8 DELTA= 0.9859999999999999 msec
SERVER1: COUNTER= 8 DELTA= 160.696 msec
SERVER2: COUNTER= 8 DELTA= 60.282000000000004 msec
SERVER4: COUNTER= 8 DELTA= 0.617 msec
SERVER3: COUNTER= 8 DELTA= 169.09 msec
SERVER0: COUNTER= 9 DELTA= 129.679 msec
SERVER1: COUNTER= 9 DELTA= 107.504 msec
SERVER2: COUNTER= 9 DELTA= 8.319999999999999 msec
SERVER3: COUNTER= 9 DELTA= 97.829 msec
SERVER4: COUNTER= 9 DELTA= 262.472 msec
SERVER0: COUNTER= 10 DELTA= 188.364 msec
SERVER2: COUNTER= 10 DELTA= 101.07 msec
SERVER3: COUNTER= 10 DELTA= 116.54100000000001 msec
SERVER1: COUNTER= 10 DELTA= 318.44899999999996 msec
SERVER4: COUNTER= 10 DELTA= 16.676 msec
SERVER0: COUNTER= 11 DELTA= 7.071 msec
SERVER1: COUNTER= 11 DELTA= 60.224 msec
SERVER2: COUNTER= 11 DELTA= 101.07199999999999 msec
SERVER3: COUNTER= 11 DELTA= 45.32 msec
SERVER4: COUNTER= 11 DELTA= 11.719999999999999 msec
SERVER0: COUNTER= 12 DELTA= 125.88199999999999 msec
SERVER1: COUNTER= 12 DELTA= 75.607 msec
SERVER2: COUNTER= 12 DELTA= 84.648 msec
SERVER3: COUNTER= 12 DELTA= 44.051 msec
SERVER4: COUNTER= 12 DELTA= 290.6 msec
SERVER0: COUNTER= 13 DELTA= 0.306 msec
SERVER1: COUNTER= 13 DELTA= 58.865 msec
SERVER2: COUNTER= 13 DELTA= 101.007 msec
SERVER3: COUNTER= 13 DELTA= 12.927 msec
SERVER4: COUNTER= 13 DELTA= 212.348 msec
SERVER0: COUNTER= 14 DELTA= 53.222 msec
SERVER1: COUNTER= 14 DELTA= 63.087 msec
SERVER2: COUNTER= 14 DELTA= 112.285 msec
SERVER4: COUNTER= 14 DELTA= 0.192 msec
SERVER3: COUNTER= 14 DELTA= 111.608 msec
SERVER0: COUNTER= 15 DELTA= 41.897999999999996 msec
SERVER2: COUNTER= 15 DELTA= 0.514 msec
SERVER3: COUNTER= 15 DELTA= 30.408 msec
SERVER1: COUNTER= 15 DELTA= 261.84499999999997 msec
SERVER4: COUNTER= 15 DELTA= 69.785 msec
SERVER0: COUNTER= 16 DELTA= 88.022 msec
SERVER2: COUNTER= 16 DELTA= 19.599999999999998 msec
SERVER1: COUNTER= 16 DELTA= 201.69500000000002 msec
SERVER3: COUNTER= 16 DELTA= 52.805 msec
SERVER4: COUNTER= 16 DELTA= 8.53 msec
SERVER0: COUNTER= 17 DELTA= 0.324 msec
SERVER1: COUNTER= 17 DELTA= 159.975 msec
SERVER2: COUNTER= 17 DELTA= 58.62 msec
SERVER4: COUNTER= 17 DELTA= 0.462 msec
SERVER3: COUNTER= 17 DELTA= 100.717 msec
SERVER0: COUNTER= 18 DELTA= 68.68100000000001 msec
SERVER1: COUNTER= 18 DELTA= 8.701 msec
SERVER2: COUNTER= 18 DELTA= 16.889999999999997 msec
SERVER3: COUNTER= 18 DELTA= 156.637 msec
SERVER4: COUNTER= 18 DELTA= 56.296 msec
SERVER0: COUNTER= 19 DELTA= 29.073 msec
SERVER2: COUNTER= 19 DELTA= 30.326999999999998 msec
SERVER3: COUNTER= 19 DELTA= 0.155 msec
SERVER1: COUNTER= 19 DELTA= 251.63200000000003 msec
SERVER4: COUNTER= 19 DELTA= 5.305 msec
最佳答案
这是由于Python's Global Interpreter Lock (GIL)
造成的,只能限制并发处理速度。来源:https://jeffknupp.com/blog/2013/06/30/pythons-hardest-problem-revisited/
为了获得更快的机会或完成一项任务,您将不得不执行另一个进程(非线程),或者只是移至诸如c++之类的语言,该语言将启用并发线程和处理,而不会在线程限制上“锁定”。
关于python-3.x - python : multithreaded unix socket transfers are very slow,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/46309322/
问题故障解决记录 -- Java RMI Connection refused to host: x.x.x.x .... 在学习JavaRMI时,我遇到了以下情况 问题原因:可
我正在玩 Rank-N-type 并尝试输入 x x .但我发现这两个函数可以以相同的方式输入,这很不直观。 f :: (forall a b. a -> b) -> c f x = x x g ::
这个问题已经有答案了: How do you compare two version Strings in Java? (31 个回答) 已关闭 8 年前。 有谁知道如何在Java中比较两个版本字符串
这个问题已经有答案了: How do the post increment (i++) and pre increment (++i) operators work in Java? (14 个回答)
下面是带有 -n 和 -r 选项的 netstat 命令的输出,其中目标字段显示压缩地址 (127.1/16)。我想知道 netstat 命令是否有任何方法或选项可以显示整个目标 IP (127.1.
我知道要证明 : (¬ ∀ x, p x) → (∃ x, ¬ p x) 证明是: theorem : (¬ ∀ x, p x) → (∃ x, ¬ p x) := begin intro n
x * x 如何通过将其存储在“auto 变量”中来更改?我认为它应该仍然是相同的,并且我的测试表明类型、大小和值显然都是相同的。 但即使 x * x == (xx = x * x) 也是错误的。什么
假设,我们这样表达: someIQueryable.Where(x => x.SomeBoolProperty) someIQueryable.Where(x => !x.SomeBoolProper
我有一个字符串 1234X5678 我使用这个正则表达式来匹配模式 .X|..X|X. 我得到了 34X 问题是为什么我没有得到 4X 或 X5? 为什么正则表达式选择执行第二种模式? 最佳答案 这里
我的一个 friend 在面试时遇到了这个问题 找到使该函数返回真值的 x 值 function f(x) { return (x++ !== x) && (x++ === x); } 面试官
这个问题在这里已经有了答案: 10年前关闭。 Possible Duplicate: Isn't it easier to work with foo when it is represented b
我是 android 的新手,我一直在练习开发一个针对 2.2 版本的应用程序,我需要帮助了解如何将我的应用程序扩展到其他版本,即 1.x、2.3.x、3 .x 和 4.x.x,以及一些针对屏幕分辨率
为什么案例 1 给我们 :error: TypeError: x is undefined on line... //case 1 var x; x.push(x); console.log(x);
代码优先: # CASE 01 def test1(x): x += x print x l = [100] test1(l) print l CASE01 输出: [100, 100
我正在努力温习我的大计算。如果我有将所有项目移至 'i' 2 个空格右侧的函数,我有一个如下所示的公式: (n -1) + (n - 2) + (n - 3) ... (n - n) 第一次迭代我必须
给定 IP 字符串(如 x.x.x.x/x),我如何或将如何计算 IP 的范围最常见的情况可能是 198.162.1.1/24但可以是任何东西,因为法律允许的任何东西。 我要带198.162.1.1/
在我作为初学者努力编写干净的 Javascript 代码时,我最近阅读了 this article当我偶然发现这一段时,关于 JavaScript 中的命名空间: The code at the ve
我正在编写一个脚本,我希望避免污染 DOM 的其余部分,它将是一个用于收集一些基本访问者分析数据的第 3 方脚本。 我通常使用以下内容创建一个伪“命名空间”: var x = x || {}; 我正在
我尝试运行我的test_container_services.py套件,但遇到了以下问题: docker.errors.APIError:500服务器错误:内部服务器错误(“ b'{” message
是否存在这两个 if 语句会产生不同结果的情况? if(x as X != null) { // Do something } if(x is X) { // Do something } 编
我是一名优秀的程序员,十分优秀!