#velocity2011

Bits of Velocity

Pieter EnnesWatchMouse

#velocity2011

➔ Take aways➔ Sponsoring➔ Mobile? DevOps➔ Histograms➔ Asynchronous

➔ SPDY

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Some take-aways

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WatchMouse

In a tweet:

→ 62

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World wide

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Public Status Pages

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Sponsoring

This year: T-shirt sponsor Brand awareness Blog + IAM

Next time: Booth

Show-case more advanced features

Get a talk!

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Themes

Themes Mobile DevOps Front-end

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Mobile theme?

KeyNote has invented a hideous mobile monitoring system (really)

http://velocityconf.com/velocity2011/public/schedule/detail/20894

More interesting: Sencha

http://velocityconf.com/velocity2011/public/schedule/detail/19967

Torbit http://velocityconf.com/velocity2011/public/schedule/detail/18135

Even better: Dedicated conference: Mobilism?

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Best keynotes

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Best keynotes

Adrian Cockcroft: Netflix in the cloud ”Could not build their data center fast enough” Amazing transition to Amazon AWS Lots of lessons in:

http://velocityconf.com/velocity2011/public/schedule/detail/17785

Cloud automatically makes Dev and Ops interleave John Rauser: Look at your data

Essential statistics for everyone http://velocityconf.com/velocity2011/public/schedule/detail/20280

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Look at your data

Histograms vs averages: Why important?

Performance always follows same model Gamma distribution(s!)

Fit to model using your eye

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Dev/Web/*Ops

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DevOps

Asynchronous stuff rocks, now even harder Pick your framework

Node.js, Twisted, Cyclone, Tornado, Gevent, …

Your queues SQS, RabbitMQ, Redis, XMPP, ...

And serialisation JSON, BSON, Thrift, ProtoBufs, XML, Avro, …

Design 'services'

The above is what the cloud is about

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SPDY

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SPDY

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SPDY

”An experimental protocol for a faster web”

Or: A layer 'between' SSL and HTTP that facilitates: Multi-plexing Prioritisation Compression Security

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SPDY: Strong points

HTTP methods remain No change in application logic

Multiplexing

Mandatory SSL But does not perform slower!

Mandatory Gzip Header compression Upstream compression

http://www.theregister.co.uk/2011/06/16/google_and_spdy/

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SPDY: Weaknesses

Mandatory SSL Every site needs a (valid) certificate Risk of devaluation, what's next? EV, E-EV?

Browsers need to communicate this properly More work for server (SSL + GZip) Caching problems

Loosen restrictions here?

No early chunked flushes? Content-Length headers mandatory

Multiplexing is hard: Slow client adaptation?http://arstechnica.com/web/news/2009/11/spdy-google-wants-to-speed-up-the-web-by-ditching-http.ars

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SPDY

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SPDY

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SPDY

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SPDY

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SPDY: Status

Google is effectively using it Chrome has enabled SPDY on 99% of the

connections; 1% baseline on HTTP IANA port nr is for non-SSL SPDY (!?)

Some benefits, some problems...

http://www.theregister.co.uk/2011/06/16/google_and_spdy/

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Questions, drinks, ...