/
parallel_test.clj
216 lines (182 loc) · 7.69 KB
/
parallel_test.clj
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(ns tech.parallel-test
(:require [clojure.test :refer :all]
[tech.parallel :as parallel]
[tech.parallel.for :as parallel-for]
[clojure.tools.logging :as log]))
(deftest order-indexed-sequence
(is (= (vec (range 1000))
(vec
(parallel/order-indexed-sequence identity
(shuffle (range 1000)))))))
(deftest ordered-queued-sequence
(let [result (:sequence (parallel/queued-sequence inc [(range 1000)]
:ordered? true))]
(is (= (count (distinct result)) 1000))
(is (= (vec result) (vec (range 1 1001))))))
(deftest queued-sequence-with-exception
(let [result (:sequence (parallel/queued-sequence (fn [idx]
(when (= idx 100)
(throw (Exception. "Failure!!")))
(inc idx))
[(range 1000)]))]
(is (thrown? RuntimeException (vec result)))))
(deftest queue-pmap-no-queue
(let [result (vec (parallel/queued-pmap 0 inc (range 100)))]
(is (= result (vec (range 1 101))))))
(deftest ordered-queued-sequence-items-in-flight
(let [items-in-flight (atom 0)
queue-depth 10
input-sequence (range 1000)
proc-fn (fn [item]
(swap! items-in-flight inc)
;;Add 1 to queue depth because we don't decrement until dereference
(when-not (<= @items-in-flight (+ queue-depth 1))
(throw (ex-info (format "Items in flight invariant borked: %s"
@items-in-flight)
{:queue-depth queue-depth
:items-in-flight @items-in-flight
:item item})))
(inc item))
result (map (fn [item]
(swap! items-in-flight dec)
item)
(:sequence (parallel/queued-sequence proc-fn [input-sequence]
:queue-depth 10
:ordered? true)))]
(is (= (vec result) (vec (range 1 1001))))))
(deftest ordered-queue-sequence-items-in-flight-2
(let [queue-depth 5
;;Infinite sequence of double arrays but only queue-depth + 1 repeating
data-arrays (->> (repeatedly (+ queue-depth 1) #(double-array 1))
(repeat)
(mapcat identity))
proc-fn (fn [idx ^doubles data-array]
(aset data-array 0 (double idx))
data-array)
;;if the invariant isn't met then we will get duplicates where one of the threads
;;overwrites a data array it should not.
result (map (fn [^doubles data-array]
(long (aget data-array 0)))
(:sequence (parallel/queued-sequence proc-fn [(range 1000) data-arrays]
:queue-depth queue-depth
:ordered? true)))]
(is (= (vec result) (vec (range 1000))))))
(deftest basic-parallel-for
(let [result-ary (int-array 1000)]
(parallel/parallel-for idx 1000
(aset result-ary idx (inc idx)))
(is (= (count (distinct (vec result-ary))) 1000))))
(defmacro or=
"Is a equal to b or c"
[a b c]
`(let [a# ~a]
(or (= a# ~b)
(= a# ~c))))
(deftest buffered-seq
(let [realized-count (atom 0)
test-seq (->> (parallel/queued-pmap
1
(fn [idx]
(swap! realized-count inc)
idx)
(range 100))
(parallel/buffered-seq 5)
(map identity))]
;;If the pmap thread has launched then this number is 1.
;;If it hasn't yet then this number is 0. We haven't blocked
;;on it yet so it could be legitimately be either 1 or 0.
;;This is true for any of the realized counts and it is important
;;to understand this ambiguity.
(is (or= @realized-count 0 1))
(is (= 0 (first test-seq)))
(is (or= @realized-count 5 6))
(is (= 1 (second test-seq)))
(is (or= @realized-count 6 7))))
(def ^:dynamic *increment-count* 0)
(deftest thread-bindings
(with-bindings {#'*increment-count* 1}
(let [increment-atom (atom 0)]
(->> (range 100)
(parallel/queued-pmap 10 (fn [_]
(swap! increment-atom (fn [val]
(+ val *increment-count*)))))
dorun)
(is (= @increment-atom 100)))))
(deftest precise-queue-behavior
(let [access-count (atom 0)
in-flight-max 2
check-in-flight-max (fn []
(when (> @access-count in-flight-max)
(throw (ex-info "In flight max constraint violation"
{:max-val @access-count}))))]
(->> (range 1000)
(parallel/queued-pmap (- in-flight-max 1)
(fn [_]
(swap! access-count inc)
(Thread/sleep 10)
(check-in-flight-max)))
(map (fn [_]
(Thread/sleep 10)
(check-in-flight-max)
(swap! access-count dec)))
vec)
(is (= @access-count 0))))
(deftest short-sequence-clean-shutdown
;;A very short sequence can result in an error if there are more threads than potential processors and
;;the launch sequence doesn't finish before one of the threads shuts down the sequence.
(let [error
(try
(dotimes [iter 10]
(->> (parallel/queued-pmap 100 identity [1 2 3])
doall)
nil)
(catch Throwable e e))]
(is (nil? error))))
(deftest short-sequence-error-clean-shutdown
;;A very short sequence can result in an error if there are more threads than
;;potential processors and the launch sequence doesn't finish before one of the
;;threads causes an exception.
(dotimes [iter 20]
(try
(->> (parallel/queued-pmap 100 (fn [& args]
(throw (ex-info "Sequence failure" {})))
[1 2 3])
doall)
(throw (ex-info "should not make it here"))
(catch Throwable e
(is (not (instance? java.util.concurrent.RejectedExecutionException e)))
nil))))
(deftest pskink-test
(log/info "Logged exception expected!!")
(let [test-atom (atom 0)]
(parallel/psink!
#(if (= 5 %)
(throw (ex-info "hey" {}))
(do
(swap! test-atom inc)
(Thread/sleep (rand-int 200))))
(range 100))
(is (= 99 @test-atom))))
(deftest parallel-memoize
(let [test-atom (atom 0)]
(dotimes [iter 100]
(let [inc-fn (parallel/memoize #(swap! test-atom inc))]
(->> (range 20)
(pmap (fn [ignored]
(inc-fn))))))
(is (= @test-atom 100))))
(deftest require-resolve
(is (not (find-ns 'clojure.inspector)))
(is (every? (complement nil?)
(->> (range 100)
(pmap (fn [idx]
(parallel/require-resolve 'clojure.inspector/inspect))))))
(is (find-ns 'clojure.inspector)))
(deftest indexed-map-reduce
(let [sum
(parallel-for/indexed-map-reduce
1000
(fn [idx n-args]
n-args)
(partial apply +))]
(is (= sum 1000))))