Another example. I'm running this on a Ubuntu 10.04 laptop with this
java:
java version "1.6.0_18"
OpenJDK Runtime Environment (IcedTea6 1.8) (6b18-1.8-0ubuntu1)
OpenJDK 64-Bit Server VM (build 14.0-b16, mixed mode)
and this command line:
java -Xmx3G -server clojure.main cat2.clj
(require '[clojure.java.io :as jio])
(defn- normalize-slurp-opts
[opts]
(if (string? (first opts))
(do
(println "WARNING: (slurp f enc) is deprecated, use (slurp
f :encoding enc).")
[:encoding (first opts)])
opts))
(defn slurp2
"Reads the file named by f using the encoding enc into a
string
and returns it."
{:added "1.0"}
([f & opts]
(let [opts (normalize-slurp-opts opts)
data (StringBuffer.)
buffer (char-array 4096)]
(with-open [#^java.io.Reader r (apply jio/reader f opts)]
(loop [c (.read r buffer)]
(if (neg? c)
(str data)
(do
(.append data buffer 0 c)
(recur (.read r buffer)))))))))
(time
(with-open [f (java.io.FileReader. "words")]
(println (count (slurp f)))))
(time
(with-open [f (java.io.FileReader. "words")]
(println (count (slurp2 f)))))
I get this output:
$ java -Xmx3G -server clojure.main cat2.clj
279440100
"Elapsed time: 17094.007487 msecs"
279440100
"Elapsed time: 5233.097287 msecs"
So at least in my environment there seems to be a big difference
between slurp2 with an explicit buffer and the core/slurp one, which
appears to be reading a character at a time from a BufferedReader
stream.
--
You received this message because you are subscribed to the Google
Groups "Clojure" group.
To post to this group, send email to [email protected]
Note that posts from new members are moderated - please be patient with your
first post.
To unsubscribe from this group, send email to
[email protected]
For more options, visit this group at
http://groups.google.com/group/clojure?hl=en
