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LET’S SCALE RUBY APPLICATIONS WITH ❤

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WHO AM I ?

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GitHub: berniechiu Twitter: berniechiu_tw Software Engineer @

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OVERVIEW • Ruby and API • Ruby and Database • Ruby and Network • Ruby and… just Ruby

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WHAT MATTERS?

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AVERAGES?

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–DHH 「1000 requests that return in 5ms, and 200 requests taking 2,000 ms, still get a respectable 170ms average」

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Only Very Happy & Very Unhappy Credit from : https://www.youtube.com/watch?v=VPYP7oJJPdo

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TUNE YOUR DESIRED METRICS

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SO WHAT MATTERS? • Popular endpoints • Slow response times

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RUBY WEB + API

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RESTFUL ENTHUSIASM

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EVEN MORE DATA?

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• github.com/zdennis/activerecord-import • github.com/jamis/bulk_insert

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ALWAYS KNOW WHAT RUNS UNDER RUBY

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RUBY DATABASE + PAGINATIONS

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Performance Impact

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For example - Kaminari

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KEEPING USER NAVIGATIONS INTACT?

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Prefetched Count

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ITERATIONS FROM ACTIVERECORD

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FIND EACH FIND IN BATCHES • Memory saving • Fetch limited rows on each batch/iteration • Won’t lock the whole table

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BUT!

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WORKING WITH UUID?

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UUID V4 IS SORTABLE?

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Credit from: https://www.postgresql.org/docs/9.6/uuid-ossp.html

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Credit From: GitLab CE Custom Implementations

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SPEED REGAIN

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RUBY LIBRARIES + NETWORK

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TYPES OF CACHING

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SKIPPING TO…

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LOCALLY FETCHED

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WAIT…FIXED FOREVER FOR FIXED FOR A PERIOD

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NO CODE CONNECTION IS FAST CODE

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Connection Takes Time

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COPE WITH USE CASES

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RUBY X THREE

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BENCHMARKING

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TOOLS FOR PARTIAL CODE https://github.com/evanphx/benchmark-ips https://github.com/jondot/benchmark-ipsa

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WHY NOT NATIVE • Only few iterations runs with Benchmark.bm or Benchmark.bmbm • Display time factors instead and need to guess a random iteration counts

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TEST YOUR THEORY

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TEST YOUR THEORY Constantized One Time Calculation

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TEST YOUR THEORY

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TEST YOUR THEORY

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SEQUEL GEM https://github.com/jeremyevans/sequel

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EVERYONE CAN CONTRIBUTE

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FLAME GRAPHS FROM API

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TOOLS?

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RACK MINI PROFILER

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AN ISSUE?

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HTML

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VERIFY!

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LOAD TEST!

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BEWARE! • APIs might have different result in different params body • Test with the most common set from online metrics or your own tracking

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調效能就跟洗浴缸⼀一樣,拔掉 那個塞⼦子,⽔水很快就流光了了

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HAPPY HACKING

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QA