Hi,
I am pleased to announce the 0.0.14 release of data.avl, a Clojure
Contrib library providing highly performant drop-in replacements for
Clojure(Script)'s built-in sorted maps and sets that support O(log n)
nth, rank-of, first-class submaps/subsets (like subseq, but preserving
collection type; fully independent from the original for GC purposes)
and splits by key and index.
[org.clojure/data.avl "0.0.14"]
<dependency>
<groupId>org.clojure</groupId>
<artifactId>data.avl</artifactId>
<version>0.0.14</version>
</dependency>
org.clojure:data.avl:0.0.14
Changes in this release:
1. http://dev.clojure.org/jira/browse/DAVL-8
Fixed a bug in split-key that caused incorrect rank and size
information to be stored in some collections resulting from splits
using a key absent from the input collection. See the ticket for a
more detailed post mortem and links to fixing commits.
Many thanks to Darrick Wiebe for the report and test.check
properties that exposed broken split-key return values!
2. http://dev.clojure.org/jira/browse/DAVL-7
data.avl maps and sets now implement CollReduce (in Clojure) /
IReduce (in ClojureScript), leading to significantly improved
reduce performance on data.avl inputs. See end of this email for
some Criterium benchmarks.
Many thanks to Francis Avila for providing the patch!
3. Seqs over data.avl collections can now be = to j.u.Lists.
4. data.avl collections now have their own print-dup implementations
that correctly round-trip in Clojure.
5. Public Vars in the clojure.data.avl namespace now carry :added
metadata.
Cheers,
Michał
Reduce benchmarks:
==================
Before patch:
-------------
user> (let [m1 (apply sorted-map (range 10000))
m2 (apply avl/sorted-map (range 10000))]
(assert (= (reduce (fn [out kv] (+ out (key kv) (val kv)))
0
m1)
(reduce (fn [out kv] (+ out (key kv) (val kv)))
0
m2)))
(c/quick-bench
(reduce (fn [out kv] (+ out (key kv) (val kv)))
0
m1))
(c/quick-bench
(reduce (fn [out kv] (+ out (key kv) (val kv)))
0
m2)))
Evaluation count : 120 in 6 samples of 20 calls.
Execution time mean : 663.862017 µs
Execution time std-deviation : 9.483652 µs
Execution time lower quantile : 654.277800 µs ( 2.5%)
Execution time upper quantile : 677.885431 µs (97.5%)
Overhead used : 21.423458 ns
Evaluation count : 468 in 6 samples of 78 calls.
Execution time mean : 1.295972 ms
Execution time std-deviation : 74.233890 µs
Execution time lower quantile : 1.255853 ms ( 2.5%)
Execution time upper quantile : 1.420871 ms (97.5%)
Overhead used : 21.423458 ns
Found 1 outliers in 6 samples (16.6667 %)
low-severe 1 (16.6667 %)
Variance from outliers : 14.4619 % Variance is moderately inflated by
outliers
nil
After patch:
------------
;;; Clojure 1.9-alpha10
user> (let [m1 (apply sorted-map (range 10000))
m2 (apply avl/sorted-map (range 10000))]
(assert (= (reduce (fn [out kv] (+ out (key kv) (val kv)))
0
m1)
(reduce (fn [out kv] (+ out (key kv) (val kv)))
0
m2)))
(c/quick-bench
(reduce (fn [out kv] (+ out (key kv) (val kv)))
0
m1))
(c/quick-bench
(reduce (fn [out kv] (+ out (key kv) (val kv)))
0
m2)))
Evaluation count : 882 in 6 samples of 147 calls.
Execution time mean : 687.923681 µs
Execution time std-deviation : 17.527428 µs
Execution time lower quantile : 669.270395 µs ( 2.5%)
Execution time upper quantile : 710.828484 µs (97.5%)
Overhead used : 2.633678 ns
Evaluation count : 2940 in 6 samples of 490 calls.
Execution time mean : 207.386184 µs
Execution time std-deviation : 7.420049 µs
Execution time lower quantile : 202.829682 µs ( 2.5%)
Execution time upper quantile : 219.880774 µs (97.5%)
Overhead used : 2.633678 ns
Found 1 outliers in 6 samples (16.6667 %)
low-severe 1 (16.6667 %)
Variance from outliers : 13.8889 % Variance is moderately inflated by
outliers
nil
;;; Clojure 1.5.1
user> (let [m1 (apply sorted-map (range 10000))
m2 (apply avl/sorted-map (range 10000))]
(assert (= (reduce (fn [out kv] (+ out (key kv) (val kv)))
0
m1)
(reduce (fn [out kv] (+ out (key kv) (val kv)))
0
m2)))
(c/quick-bench
(reduce (fn [out kv] (+ out (key kv) (val kv)))
0
m1))
(c/quick-bench
(reduce (fn [out kv] (+ out (key kv) (val kv)))
0
m2)))
Evaluation count : 990 in 6 samples of 165 calls.
Execution time mean : 599.205620 µs
Execution time std-deviation : 30.389791 µs
Execution time lower quantile : 579.132582 µs ( 2.5%)
Execution time upper quantile : 650.985417 µs (97.5%)
Overhead used : 1.320107 ns
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