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talk given by John Ousterhout about sustaining relationships
"Scar Tissues Make Relationships Wear Out"
04/26/2103. From a lecture by Professor John Ousterhout at Stanford, class CS142.
This is my most touchy-feely thought for the weekend. Here’s the basic idea: It’s really hard to build relationships that last for a long time. If you haven’t discovered this, you will discover this sooner or later. And it's hard both for personal relationships and for business relationships. And to me, it's pretty amazing that two people can stay married for 25 years without killing each other.
[Laughter]
> But honestly, most professional relationships don't last anywhere near that long. The best bands always seem to break up after 2 or 3 years. And business partnerships fall apart, and there's all these problems in these relationships that just don't last. So, why is that? Well, in my view, it’s relationships don't fail because there some single catastrophic event to destroy them, although often there is a single catastrophic event around the the end of the relation
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Uploading to S3 in 18 lines of Shell (used to upload builds for http://soltrader.net)
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Turning PostgreSQL into a queue serving 10,000 jobs per second
Turning PostgreSQL into a queue serving 10,000 jobs per second
RDBMS-based job queues have been criticized recently for being unable to handle heavy loads. And they deserve it, to some extent, because the queries used to safely lock a job have been pretty hairy. SELECT FOR UPDATE followed by an UPDATE works fine at first, but then you add more workers, and each is trying to SELECT FOR UPDATE the same row (and maybe throwing NOWAIT in there, then catching the errors and retrying), and things slow down.
On top of that, they have to actually update the row to mark it as locked, so the rest of your workers are sitting there waiting while one of them propagates its lock to disk (and the disks of however many servers you're replicating to). QueueClassic got some mileage out of the novel idea of randomly picking a row near the front of the queue to lock, but I can't still seem to get more than an an extra few hundred jobs per second out of it under heavy load.
Dashing widget to display a Jenkins build status and build progress
The widget is based on the meter-widget which is default in the Dashing installation
The widget can also see the progress of a "pre-build", i.e if you have a job triggering the actual build you want to define, you can configure this job in the jenkins_build.rb as a prebuild.