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Hi (some code)
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Fun
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Learn
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Software
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Works
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Performance and Lies
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Tom Crayford @t_crayford
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Yeller
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Input
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Input DB
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1 million events/s/ node
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WIN LIES WIN LIES WIN LIES LIES WIN WIN LIES WIN WIN
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WIN LIES WIN LIES WIN WIN LIES WIN JVM HAND TOOLS
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WIN LIES WIN LIES WIN WIN LIES WIN JVM HAND TOOLS
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DISCLAIMER
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No content
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Always Be Measuring A B M
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Continous Automated Performance Testing
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Experiment with new libs & techniques
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benchmarking…
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3 ms 5s
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Couldn’t Reproduce
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Time
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Time Boot
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Time Boot Bench 1
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Time Boot Bench 1 Bench 2
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Time
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Bench 1
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Bench 1
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Bench 1
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Bench 1 Bench 2
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Bench 1 Bench 2
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PATH DEPENDENCY
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Time
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Time
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Time
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Optimization Flags
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FLAG WIN
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FLAG WIN -Xmn -Xmx etc
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FLAG WIN -Xmn -Xmx etc 15%
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FLAG WIN AggressiveOpts -Xmn -Xmx etc 15%
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FLAG WIN AggressiveOpts 6.4% -Xmn -Xmx etc 15%
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FLAG WIN AggressiveOpts 6.4% -Xmn -Xmx etc 15% UseCompressedOops
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FLAG WIN AggressiveOpts 6.4% -Xmn -Xmx etc 15% UseCompressedOops 8.1%
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32%
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-XX:TieredStopAtLevel=1
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Lein
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Startup Time
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-XX:TieredStopAtLevel=1
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1 million 380k
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:jvm-opts ^:replace [“-server”]
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Inlining
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(defn b [foo] (inc foo))
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(defn a [foo] (b foo)) (defn b [foo] (inc foo))
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(defn a [foo] (b foo)) (defn b [foo] (inc foo))
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(defn a [foo] (inc foo))
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enables optimizations
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(defn things [foo n]
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(defn things [foo n] (dotimes [_ n]
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(defn things [foo n] (dotimes [_ n] (b foo)))
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(defn things [foo n] (dotimes [_ n] (b foo))) (defn something [foo]
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(defn things [foo n] (dotimes [_ n] (b foo))) (defn something [foo] (things foo 0))
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(defn things [foo n] (dotimes [_ n] (b foo))) (defn something [foo] (things foo 0))
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(defn something [foo] (dotimes [_ 0] (b foo))
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(defn something [foo] nil)
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August
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“this error always happens on Chrome 36.0”
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250k 25k
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Hammock
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20 minutes of function extracting later
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248k 25k
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(assoc thing :key1 (f-a a-thing) :key-2 (f-b a-thing) :key3 (f-c a-thing) :key4 (f-d a-thing))
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FreqInlineSize=325
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MaxInlineLevel=9
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no.dissassemble
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Profilers
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Safe Points
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Known Memory
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Time
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Time
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Time
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Time
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Time
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Time
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Time
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Time
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Time
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Time
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Time
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Time
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Back edge of loops Method Return
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Sampling Profilers
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Time
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Time
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Flight Recorder
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-XX:+UnlockDiagnosticVMOptions -XX:+DebugNonSafepoints
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WIN LIES WIN LIES WIN LIES LIES WIN WIN LIES WIN WIN
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WIN LIES WIN LIES WIN WIN LIES WIN JVM HAND TOOLS
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WIN LIES WIN LIES WIN WIN LIES WIN JVM HAND TOOLS
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Clojure
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maps are cheap?
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defrecord
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[1 2]
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(deftype Tuple1 [e1]) (deftype Tuple2 [e1 e2])
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test.check 23% [h c]
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onyx 6.4% (:foo blah)
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cambrian collections CLJ-1517 & CLJ-1610
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(.__extmap record)
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Profiler caught bug
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Fun
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Learn
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Software
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Works
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(:or (:fingerprint error) (compute-fingerprint error))
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:or
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:or
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:or
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:or :or :or :or :or :o or
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(:or "2e4312c83e985..." (compute-fingerprint error))
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1.4ms 0.34ms
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(:or (:fingerprint error) (compute-fingerprint error))
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(or (:fingerprint error) (compute-fingerprint error))
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commit 0c9d7392b7b2ea51383cc46394b2b0 Author: Tom Crayford Date: Mon Jul 1 10:52:04 2013 +0100
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References
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Conclusion
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WIN LIES WIN LIES WIN LIES LIES WIN WIN LIES WIN
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WIN LIES WIN LIES WIN WIN LIES WIN JVM HAND TOOLS
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WIN LIES WIN LIES WIN WIN LIES WIN JVM HAND TOOLS
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Fun
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Learn
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Software
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Works
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@t_crayford
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Performance and Lies
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Thanks @t_crayford