exceptions.clj

(ns experiments.exceptions)

(comment
  (require '[criterium.core :as c])

  (c/quick-bench
      (Object.))
  ;; Execution time mean : 5,429811 ns

  (c/quick-bench
      ((fn [] (Object.))))
  ;; Execution time mean : 6,984797 ns

  (c/quick-bench
      ((fn [] ["" {}])))
  ;; Execution time mean : 8,057194 ns

  (let [ex (RuntimeException.)]
    (c/quick-bench
        (try
          ((fn [] (throw ex)))
          (catch RuntimeException ex*
            ex*))))
  ;; Execution time mean : 5,052186 ns

  (c/quick-bench
      (RuntimeException. ""))
  ;; Execution time mean : 3,264115 µs
  ;;                                ^^

  ;; -XX:-StackTraceInThrowable
  ;; Execution time mean : 61,303768 ns

  (c/quick-bench
      ;; protected constructor
      ;; false - это отключить стектрейсы
      (proxy [RuntimeException] ["" nil true false]))
  ;; Execution time mean : 25,065547 ns

  ;; прото проаверить
  ;; -XX:-StackTraceInThrowable
  ;; Execution time mean : 25,994738 ns

  (c/quick-bench
      (try
        (throw (RuntimeException. ""))
        (catch RuntimeException ex*
          ex*)))
  ;; Execution time mean : 3,275888 µs
  ;;                                ^^

  ;; -XX:-StackTraceInThrowable
  ;; Execution time mean : 62,283648 ns

  (c/quick-bench
    (try
      (throw (proxy [RuntimeException] ["" nil true false]))
      (catch RuntimeException ex*
        ex*)))
  ;; Execution time mean : 27,427171 ns


  (require '[clojure.repl.deps :as deps])
  (deps/add-libs '{darkleaf/no-stack-trace {:mvn/version "1.0.0"}})
  (require '[darkleaf.no-stack-trace :as nst])

  (c/quick-bench
    (try
      (throw (throw (nst/ex-info "" {})))
      (catch RuntimeException ex*
        ex*)))
  ;; Execution time mean : 17,792664 ns


  (c/quick-bench
      (assoc nil :foo :bar))
  ;; Execution time mean : 19,690760 ns

  (c/quick-bench
      (assoc {} :foo :bar))
  ;; Execution time mean : 23,187041 ns

  #_"
* создать объект                8ns (5ns)     -XX:-StackTraceInThrowable
* заранее созданное исключение  5ns
* stacktrace                 3000ns           62ns
* no stacktrace                17ns (27ns)
* assoc                        19ns

ребята недавно померяли на java
https://www.baeldung.com/java-exceptions-performance

        stack    no stack -XX:-StackTraceInThrowable
у меня  3000ns   17ns     62ns
у них   16.449ms          1.185ms

У меня разница на 2 порядка, а у инх на 1.
Они выключали стек по другой методе, через -XX:-StackTraceInThrowable
И программы бенчмарка разные.
"
  ,,,)