Re: OpenSSI 1.9.6 in the making

Roger, John, and the other active OpenSSI developers,

Congratulations on all your hard work this year!

Best regards,
Brian

> -----Original Message-----
> From: Roger Tsang [mailto:[email protected]]
> Sent: Tuesday, November 10, 2009 12:06 AM
> To: ssic-linux-devel
> Subject: [SSI-devel] OpenSSI 1.9.6 in the making
> 
> Hi,
> 
> These are just some thoughts I'd like to share.
> 
> As you know the original plan was to release 2.0.0pre3 as 1.9.6 around
> first half of year 2009.  Early in the year we decided to rename the
> release to 1.9.6 due to the amount of changes to the core.  However
> one criteria I had in mind for making this release was improved
> stability from the previous release.  At the time I did not feel we've
> met this criteria.  At the same time some people felt that porting to
> 2.6.18 is more urgent, but I strongly believe the core should be
> stabilized first to ensure we won't have to deal with outstanding core
> bugs that could impact our porting effort.
> 
> So we ended up focusing our effort fixing core bugs.  At the same time
> I took the opportunity to increase the performance of OpenSSI.  Thanks
> to John Hughes we also identified some useful regression tests.  Today
> most of the bugs in our tracker are closed or fixed.  We also
> completed more than a few OpenSSI enhancements / feature requests in
> our tracker.
> 
> During the course of the year we've seen almost 20,000 lines of code
> (LoC) changes at the core.  The net change is less but this is still
> 5-10x more than the previous year.  I haven't really looked up the
> numbers; that's my impression.  Worthy of mention in addition to
> system latency performance improvements is the time and effort taken
> to address the more obscure bugs only seen on multi-core / SMP
> machines and preemptive kernels.
> 
> Though rarely mentioned I believe one of the major technical obstacles
> to reaching stable was OpenSSI-1.9.x had been suffering the same class
> of problems the openMosix project (now defunct) had long struggled
> with and that is SMP bugs.  If I'm not wrong the developers who have
> forked openMosix are still dealing with these problems.  So I am
> thankful that most of our OpenSSI developers and designers kept this
> in mind when porting to Linux and am grateful that we are able to
> overcome the remaining issues considering our OpenSSI code base is
> much larger than openMosix and considering we've integrated some
> openMosix code (eek!).
> 
> 
> Regards,
> Roger
> 
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