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@whippersnapper
whippersnapper / .bash_profile
Last active Oct 14, 2015
Detached Switchable JDK
View .bash_profile
function setjdk() {
if [ $# -ne 0 ]; then
removeFromPath '/System/Library/Frameworks/JavaVM.framework/Home/bin'
if [ -n "${JAVA_HOME+x}" ]; then
removeFromPath $JAVA_HOME
fi
export JAVA_HOME=`/usr/libexec/java_home -v $@`
export PATH=$JAVA_HOME/bin:$PATH
fi
}
@jboner
jboner / latency.txt
Last active Oct 18, 2019
Latency Numbers Every Programmer Should Know
View latency.txt
Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference 0.5 ns
Branch mispredict 5 ns
L2 cache reference 7 ns 14x L1 cache
Mutex lock/unlock 25 ns
Main memory reference 100 ns 20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy 3,000 ns 3 us
Send 1K bytes over 1 Gbps network 10,000 ns 10 us
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD
@bmabey
bmabey / memoize_fn.clj
Created Aug 10, 2011
memoized anonymous functions in clojure
View memoize_fn.clj
; inspired from http://stackoverflow.com/questions/3906831/how-do-i-generate-memoized-recursive-functions-in-clojure
(defmacro memoize-fn
"Produces a memoized anonymous function that can recursively call itself."
[fn-name & fn-args]
`(with-local-vars
[~fn-name (memoize
(fn ~@fn-args))]
(.bindRoot ~fn-name @~fn-name)
@~fn-name))
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