 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
Java Forum / General / February 2006Non Blocking Server - High CPU Usage
Hello, I was trying out the source code from http://www.owlmountain.com/tutorials/NonBlockingIo.htm#_Toc524339534 It so happens that CPU Usage becomes 100% even if a single client is connected to the server. It stays at 100% until all clients disconnect. Is this normal? Server has been tested on Windows 2003 and XP. Thanks! > I was trying out the source code from > [quoted text clipped - 3 lines] > connected to the server. It stays at 100% until all clients > disconnect. I haven't tested the code, but I'll guess the problem is due to the fact that they register interest in OP_WRITE for every connection. Remove that and see if the problem goes away. Normally a connection is writeable until write() fails. It's only then you should register OP_WRITE, and then only until the connection becomes writeable again. There was a thread about this here recently, "NIO busywaiting". /gordon  Signature[ do not email me copies of your followups ] g o r d o n + n e w s @ b a l d e r 1 3 . s e >> I was trying out the source code from >> [quoted text clipped - 15 lines] > > /gordon It's either the issue mentioned above or you using selectNow instead of select. There are only two points in time where you want to register for OP_WRITE namely after a connect/accept (using it as a notification for when writing is possible) and when a write initially failed so you can try again once OP_WRITE is selected. At all other times writing should be valid. Remon van Vliet Thanks for the replies. I'll test these out and get back on this thread. Another issue that just came to my mind ... if a write fails and I then register interest in OP_WRITE, it means that the message that was supposed to be sent in the failed attempt should be buffered by me? > Another issue that just came to my mind ... if a write fails and I then > register interest in OP_WRITE, it means that the message that was > supposed to be sent in the failed attempt should be buffered by me? If write fails, then it's completely up to you to deal with it, including buffering the message in order to try again later if that's what you want to do. /gordon Signature[ do not email me copies of your followups ] g o r d o n + n e w s @ b a l d e r 1 3 . s e thanks gordon, also i have tried removing the OP_WRITE and it works great. CPU usage is no longer 100% Thank you so much! Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
|
Reply to this Message
|
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2009 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.