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timvisher/egregious-performance-difference.txt

Created August 14, 2022 01:18
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egregious-performance-difference.txt
4.4.23$ grep -H '.*' x.clj; clojure -e "$(< x.clj)"
x.clj:(import '[java.nio.file Files FileVisitOption Path])
x.clj:(time
x.clj: (-> (Files/walk (Path/of "." (into-array String []))
x.clj: (into-array FileVisitOption []))
x.clj: (.iterator)
x.clj: iterator-seq
x.clj: count))
WARNING: Implicit use of clojure.main with options is deprecated, use -M
java.nio.file.Path
"Elapsed time: 42135.852273 msecs"
318274
4.4.23$ time find . -printf '.' | wc -c
318274
real 0m0.499s
user 0m0.084s
sys 0m0.241s
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