On Mon, Oct 22, 2001 at 08:05:42AM -0700, Homayoun Yousefi'zadeh wrote: > Hello All, > > I have a question regarding a ping program > in Java. I am trying to improve the performance > of an infinite ping loop by keeping the socket > open and using SO_KEEPALIVE option instead of > opening and closing a client socket once every > few seconds.
If you're willing to use JNI, you can change the keepalive interval with the native setsockopt() call. Two options control keepalive behavior: TCP_KEEPIDLE (when to start keepalives on an idle socket), and TCP_KEEPINTVL (keepalive interval). You'll find those options defined in /usr/include/netinet/tcp.h. Whether messing with keepalives will give you the ping functionality you really want... that's another question. Keepalive is a TCP option, and "ping" usually implies a particular ICMP (!= TCP) protocol request and response. Nathan > I have been looking at the documentation trying > to find out how I can change the default probe > timing of 2 hours for SO_KEEPALIVE but been out > of luck. SO far the only implementation I know of > that allows the SO_KEEPALIVE interval to be set > per connection is SVR4.2. > > Any hint on how I can do this on Linux relatively > easily? Any suggestion will be greatly appreciated. > I would also like to hear any other suggestion > you may have for enhancing the performance of > the ping loop as well as seeing any code snippet > or pointer. > > Thanks in advance. > > HY > > > > > ---------------------------------------------------------------------- > To UNSUBSCRIBE, email to [EMAIL PROTECTED] > with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED] > -- ---------------------------------------------------------------------- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
