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Java Forum / General / April 2006taking a long time to send an object in rmi??
hi.. i tried to create a rmi server sample and a client, problem is if i try to send an object (even one with no fields or nothing just a dummy) it takes the server 60-80 seconds just to recieve it!! (this is between 2 computers). > hi.. > i tried to create a rmi server sample and a client, problem is if i try > to send an object (even one with no fields or nothing just a dummy) it > takes the server 60-80 seconds just to recieve it!! (this is between 2 > computers). That's way too long, you probably forget to flush your stream or otherwise made a mistake within your IO code. How about you post the relevant bits of your code so we can have a look? i didn't flush anything, all i have is a method that simply accepts and object and stores in a members. and on the client i have somethign that sends a new object this only happens with new objects btw, let's say for example i created a new object and send it to the remote object, if i send the same object again, i won't get a laaag. but i created this becluse i have a closed java application which has the same issues and i wanted to pin point where is the problem, on another network, this takes around 200ms, but on this network it takes such a long a time. would you happen to know what in a network could cause this? (intranet same building ). >i didn't flush anything. Maybe that's your problem. You should be flushing after you finished sending whatever it is you're trying to send. - Oliver >> i didn't flush anything. > > Maybe that's your problem. You should be flushing after you finished > sending whatever it is you're trying to send. Err, no, this is RMI, there are no flushes, there are just remote method calls. Most RMI performance problems are in reality DNS problems. Check how long it takes to ping the server host from the client. but what if i use a actual ips? even then i get the same slowness > but what if i use a actual ips? even then i get the same slowness Get a network sniffer an check what is really going on. /Thomas  SignatureThe comp.lang.java.gui FAQ: ftp://ftp.cs.uu.nl/pub/NEWS.ANSWERS/computer-lang/java/gui/faq http://www.uni-giessen.de/faq/archiv/computer-lang.java.gui.faq/ > but what if i use a actual ips? even then i get the same slowness Stop guessing and download Ethereal. Use it to see what is really happening on the network while your call is taking time. /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 > but what if i use a actual ips? even then i get the same slowness RMI (or something lower in the Java stack) does a reverse lookup on an IP address so DNS is still involved. >i tried to create a rmi server sample and a client, problem is if i try >to send an object (even one with no fields or nothing just a dummy) it >takes the server 60-80 seconds just to recieve it!! (this is between 2 >computers). In windows, you can set up some name:ip pairs in the hosts. file. Presumably other OS have a similar mechanism for setting up high speed DNS lookup on a few names. see http://mindprod.com/jgloss/hosts.html SignatureCanadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. > In windows, you can set up some name:ip pairs in the hosts. file. > Presumably other OS have a similar mechanism for setting up high speed > DNS lookup on a few names. In and *nix you can do exactly the same in /etc/hosts You can also run a local copy of named, the DNS server, which can be configured to caches non-local name:IP pairs. This is the best solution because it automatically tracks IP changes. Signaturemartin@ | Martin Gregorie gregorie. | Essex, UK org | 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 ...
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