Python Programming
 
Forums: » Register « |  User CP |  Games |  Calendar |  Members |  FAQs |  Sitemap |  Support | 
User Name:
Password:
Remember me
Go Back   Dev Shed ForumsProgramming LanguagesPython Programming

Reply
Add This Thread To:
  Del.icio.us   Digg   Google   Spurl   Blink   Furl   Simpy   Y! MyWeb 
Thread Tools Search this Thread Rate Thread Display Modes
 
Unread Dev Shed Forums Sponsor:
  #1  
Old June 13th, 2004, 09:42 PM
xlordt's Avatar
xlordt xlordt is offline
Only the strong survives!!.
Dev Shed God 1st Plane (5500 - 5999 posts)
 
Join Date: Feb 2003
Location: A World of wonders.
Posts: 5,553 xlordt User rank is Major (30000 - 40000 Reputation Level)xlordt User rank is Major (30000 - 40000 Reputation Level)xlordt User rank is Major (30000 - 40000 Reputation Level)xlordt User rank is Major (30000 - 40000 Reputation Level)xlordt User rank is Major (30000 - 40000 Reputation Level)xlordt User rank is Major (30000 - 40000 Reputation Level)xlordt User rank is Major (30000 - 40000 Reputation Level)xlordt User rank is Major (30000 - 40000 Reputation Level)xlordt User rank is Major (30000 - 40000 Reputation Level)xlordt User rank is Major (30000 - 40000 Reputation Level)  Folding Points: 110809 Folding Title: Super Ultimate Folder - Level 1Folding Points: 110809 Folding Title: Super Ultimate Folder - Level 1Folding Points: 110809 Folding Title: Super Ultimate Folder - Level 1Folding Points: 110809 Folding Title: Super Ultimate Folder - Level 1Folding Points: 110809 Folding Title: Super Ultimate Folder - Level 1Folding Points: 110809 Folding Title: Super Ultimate Folder - Level 1
Time spent in forums: 1 Month 3 h 36 m 8 sec
Reputation Power: 378
Send a message via ICQ to xlordt Send a message via AIM to xlordt Send a message via MSN to xlordt Send a message via Yahoo to xlordt Send a message via Google Talk to xlordt Send a message via Skype to xlordt
Facebook MySpace
Select( ) Vs Thread( )

What would you rather use? cause right now im using select to run a while loop in gui program.. and every things runs smothly.. but.. i always get people asking.. "Why are you using select?" or "Why are you using thread" and i want to know what the users here think, as i feel better getting an answer here ( my home ) then any other place, i read about select.. and read a bit about thread and.. i think that select is a good way to go

Reply With Quote
  #2  
Old June 13th, 2004, 10:40 PM
NetBSD NetBSD is offline
Contributing User
Dev Shed Newbie (0 - 499 posts)
 
Join Date: Apr 2004
Location: Canada
Posts: 234 NetBSD Negative: is most likely a SPAMMER and a traitor to the cause. 
Time spent in forums: 9 h 25 m 35 sec
Reputation Power: 0
Send a message via MSN to NetBSD
Using threads will add extra complexity to your script. You will have to think about race conditions and the way in which you're going to share data in between threads.

Reply With Quote
  #3  
Old June 14th, 2004, 01:50 AM
Scorpions4ever's Avatar
Scorpions4ever Scorpions4ever is offline
Banned ;)
Dev Shed God 6th Plane (7500 - 7999 posts)
 
Join Date: Nov 2001
Location: Glendale, Los Angeles County, California, USA
Posts: 7,672 Scorpions4ever User rank is General 2nd Grade (Above 100000 Reputation Level)Scorpions4ever User rank is General 2nd Grade (Above 100000 Reputation Level)Scorpions4ever User rank is General 2nd Grade (Above 100000 Reputation Level)Scorpions4ever User rank is General 2nd Grade (Above 100000 Reputation Level)Scorpions4ever User rank is General 2nd Grade (Above 100000 Reputation Level)Scorpions4ever User rank is General 2nd Grade (Above 100000 Reputation Level)Scorpions4ever User rank is General 2nd Grade (Above 100000 Reputation Level)Scorpions4ever User rank is General 2nd Grade (Above 100000 Reputation Level)Scorpions4ever User rank is General 2nd Grade (Above 100000 Reputation Level)Scorpions4ever User rank is General 2nd Grade (Above 100000 Reputation Level)Scorpions4ever User rank is General 2nd Grade (Above 100000 Reputation Level)Scorpions4ever User rank is General 2nd Grade (Above 100000 Reputation Level)Scorpions4ever User rank is General 2nd Grade (Above 100000 Reputation Level)Scorpions4ever User rank is General 2nd Grade (Above 100000 Reputation Level)Scorpions4ever User rank is General 2nd Grade (Above 100000 Reputation Level)Scorpions4ever User rank is General 2nd Grade (Above 100000 Reputation Level) 
Time spent in forums: 1 Month 2 Days 23 h 13 m 55 sec
Reputation Power: 1083
Got to remember that adding threads to a Python program to try speeding it up, does not always work. Reason: Python has a Global Interpreter Lock (GIL) that is set every time you try to access a python object and only the thread that holds the lock can access the object. In order for other threads to get some access to the GIL, the interpreter releases the lock every sys.setcheckinterval bytecodes (default = 10 bytecoee instructions) or if the thread blocks for an I/O operation. This way, another thread can acquire the lock and continue.
__________________
Up the Irons
What Would Jimi Do? Smash amps. Burn guitar. Take the groupies home.
"Death Before Dishonour, my Friends!!" - Bruce D ickinson, Iron Maiden Aug 20, 2005 @ OzzFest
Down with Sharon Osbourne

Puzzle of the Month solved by Keath and KevinADC, superior perl programmers of the month

Reply With Quote
  #4  
Old June 14th, 2004, 03:46 AM
DevCoach DevCoach is offline
Contributing User
Dev Shed Beginner (1000 - 1499 posts)
 
Join Date: Feb 2004
Location: London, England
Posts: 1,243 DevCoach User rank is Captain (20000 - 30000 Reputation Level)DevCoach User rank is Captain (20000 - 30000 Reputation Level)DevCoach User rank is Captain (20000 - 30000 Reputation Level)DevCoach User rank is Captain (20000 - 30000 Reputation Level)DevCoach User rank is Captain (20000 - 30000 Reputation Level)DevCoach User rank is Captain (20000 - 30000 Reputation Level)DevCoach User rank is Captain (20000 - 30000 Reputation Level)DevCoach User rank is Captain (20000 - 30000 Reputation Level)DevCoach User rank is Captain (20000 - 30000 Reputation Level) 
Time spent in forums: 1 Week 6 Days 5 h 41 m 59 sec
Reputation Power: 265
It depends what your program is doing.

If you are reading from a socket then select is a viable solution - look at the asyncore library for a high level wrapper to it. However using select on files and pipes will only work on UNIX systems, so will not be portable to Windows. This may or may not be a problem for you.

There will probably be times when you want concurrent processing that does not do IO at all, then select will be useless and you will have to use threads.

Dave - The Developers' Coach

Reply With Quote
Reply

Viewing: Dev Shed ForumsProgramming LanguagesPython Programming > Select( ) Vs Thread( )


Thread Tools  Search this Thread 
Search this Thread:

Advanced Search
Display Modes  Rate This Thread 
Rate This Thread:


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
View Your Warnings | New Posts | Latest News | Latest Threads | Shoutbox
Forum Jump


Forums: » Register « |  User CP |  Games |  Calendar |  Members |  FAQs |  Sitemap |  Support | 
  
 





© 2003-2008 by Developer Shed. All rights reserved. DS Cluster 5 hosted by Hostway
Stay green...Green IT