Hiram Chirino wrote:
> Hi Loren!
>
> >From: Loren Rosen <[EMAIL PROTECTED]>
> >To: "[EMAIL PROTECTED]"
> ><[EMAIL PROTECTED]>
> >Subject: [JBoss-dev] jbossmq: persistance implementation questions
> >Date: Mon, 12 Nov 2001 20:22:27 -0800
> >
>
>
> >* Performance tuning/scalability: has any work been done to address
> >potential bottlenecks for high message throughput, large numbers of
> >queues or topics, etc.?
> >
>
> Work has gone into making reading/writing from storage more efficient. I
> don't think we have profiled the system enough yet to find out where the
> bottle necks are.
A good first step would be to measure the single producer/consumer latency,
and tune that. Low latency is a important goal in its own right, and moreover
if the CPU overhead is too high you won't even be able to keep the disk
busy writing messages. I can go ahead and do this.
>
>
> >* recovery robustness: recovery is a tricky thing since there's so many
> >possible ways things can fail. What's been done to think
> >about/test-for/defend-against all the possibilities?
> >
>
> Basic recovery test have been succeeding. It's hard to automate failure
> testing. More code review would be good in this area to see if we are
> missing anything.
I'll look through the code more closely. But recovery is testable. What
you have to do is create some corrupt data files (probably by using a
byte-level editor to munge some existing data files). Then you need
some scripts to start up the server with those files -- which doesn't
fit so well with a pure-Java Junit-based test suite. (You could also
create the files by making versions of the server which quit at
various awkward places.) What this won't test so easily is recovery
from failures during recovery.
> Regards,
> Hiram
>
> _________________________________________________________________
> Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp
>
> _______________________________________________
> Jboss-development mailing list
> [EMAIL PROTECTED]
> https://lists.sourceforge.net/lists/listinfo/jboss-development
_________________________________________________________
Do You Yahoo!?
Get your free @yahoo.com address at http://mail.yahoo.com
_______________________________________________
Jboss-development mailing list
[EMAIL PROTECTED]
https://lists.sourceforge.net/lists/listinfo/jboss-development
