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The Node.js Scalability Myth Felix Geisendörfer 14.06.2012 at Munich node.js user group

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Felix Geisendörfer

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transloadit.com

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core contributor

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npm modules

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node-formidable

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node-mysql

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~50 modules total

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(@)felixge(.de)

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Background

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I need to build an über-scalable web service. It will be the next big thing!

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Easy! I will use node.js and MongoDB!

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Easy! I will use node.js and MongoDB!

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Because node.js is “scalable”, right?

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This Talk

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#1 Consider Reality

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Using node for performance reasons?

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Measuring performance in production?

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1000 req / s

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100 req / s

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10 req / s 10 req / s

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~1 million requests per day

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~1 million units of value

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#2 Node Scales Vertically

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Adding more resources to a single node

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CPU

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Google V8

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JS -> Assembly

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Crankshaft JIT

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Fast

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Single Threaded* * For most parts

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Computers of the future will have hundreds of cores!

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Node’s Multi-Core Story

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Pre-fork

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IPC

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Like Ruby, Python, PHP, etc.

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But ... shared memory?

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Your problem requires shared memory?

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JavaScript is not your language

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Good Luck

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Memory

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No hard limit on 64bit (since node-0.6 / v8-3.7)

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However

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Avoid huge heaps

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Disk

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Done in thread pool

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Along with DNS

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No sendfile()

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Network

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Non-blocking I/O

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tl;dr

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pre-fork & non-blocking i/o

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#3 Horizontal Scaling is hard

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CAP

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Network Partitions

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Consistency

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Availability

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Some Tips

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Shared Nothing

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Messaging

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Monitoring

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The Node.js Scalability Myth

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Threads do not scale Node.js scales

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Threads do not scale Node.js scales

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Node is a tool

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If you can’t duc it F#@k it

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Questions? Slides will be available at felixge.de

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Thanks

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Tool Demo