chrisvest

About PrintCompilation

This note tries to document the output of PrintCompilation flag in HotSpot VM. It was originally intended to be a reply to a blog post on PrintCompilation from Stephen Colebourne. It's kind of grown too big to fit as a reply, so I'm putting it here.

Written by: Kris Mok rednaxelafx@gmail.com

Most of the contents in this note are based on my reading of HotSpot source code from OpenJDK and experimenting with the VM flags; otheres come from HotSpot mailing lists and other reading materials listed in the "References" section.

This

chrisvest

Sample service script for debianoids

Look at LSB init scripts for more information.

Usage

Copy to /etc/init.d:

# replace "$YOUR_SERVICE_NAME" with your service's name (whenever it's not enough obvious)

chrisvest

;; chrisvest's solution to For the win
;; https://4clojure.com/problem/145

(range 1 38 4)

chrisvest

;; chrisvest's solution to A nil key
;; https://4clojure.com/problem/134

#(nil? (%1 %2 1))

chrisvest

var b = false;

if (b^b&b|b) {} else {
  println("false branch");
}

chrisvest

;; chrisvest's solution to Cartesian Product
;; https://4clojure.com/problem/90

#(set (for [a %1 b %2] [a b]))

chrisvest

;; chrisvest's solution to http://4clojure.com/problem/83

#(= (set %&) #{true false})

chrisvest

;; chrisvest's solution to http://4clojure.com/problem/81

#(set (filter %1 %2))

chrisvest

;; chrisvest's solution to http://4clojure.com/problem/80

#(let [ntz (Integer/numberOfTrailingZeros %1)]
  (= (bit-shift-right %1 ntz) (dec (bit-shift-left 1 (inc ntz)))))

chrisvest

;; chrisvest's solution to http://4clojure.com/problem/80

#(let [ntz (Integer/numberOfTrailingZeros %1)
       nlz (Integer/numberOfLeadingZeros %1)]
  (= ntz (- 31 ntz nlz)))