I'm currently using Jabberd Version 1.4.2. I used the quick setup on RedHat Linux, and am able to send messages between users easily and swiftly.
The reason I'm writing is because we're doing high volume (20,000) messages that are software driven into the Jabber server, with offline accounts. This means that the XML spool files are growing quite large, even though the content of each message is quite small:
-rw------- 1 jabber jabber 1.3M Mar 23 15:24 testing.xml
It takes 3 seconds for the jabber server to write a single message to the end of this file. I've also noticed temporary files being written during this process, and (though I haven't looked at the source) believe the algorithm upon receipt of each new message is:
1) Copy all XML elements in the testing.xml file into the temporary file, up until the closing elements.
2) Append the new message onto the end of the temporary file.
3) Write the closing elements.
4) Rename the temporary file over the existing file.
When a user only has a few hundred messages, this algorithm works just fine, as the file sizes are small. But when the files are a few MB in size (e.g., 7000+ messages), this algorithm suffers a severe performance penalty (between 3 and 5 seconds to add a message). We're using a dual-CPU Intel-based machine running at 1.8 GHz per chip, with 4 chip emulation enabled, and a Linux bogomip count of 3578.26. I don't know the stats on the harddrive.
If the file can be locked, I would recommend changing the algorithm:
1) Read from the end of the file until the last message 2) Truncate the file from the end of that message 3) Write the new message 4) Write whatever was truncated
Of course, you would want to keep a small journal for recovery purposes in case of a crash.
If there is a different version, or a different implementation of a Jabber server (which stores messages offline) which doesn't suffer from this performance issue, I'd really appreciate knowing.
Many thanks!
Sincerely, Dave Jarvis -- Invoq Systems Inc. t. 250.380.0304 e. [EMAIL PROTECTED] w. http://www.invoqsystems.com _______________________________________________ jdev mailing list [EMAIL PROTECTED] https://jabberstudio.org/mailman/listinfo/jdev
