[Pkg-javascript-commits] [node-iconv-lite] 33/83: Updated performance benchmark.

[matthew pideil]

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mpideil-guest pushed a commit to branch master
in repository node-iconv-lite.

commit 29c3ea8507c83594e9d24c9e6d2922e4760d9ed0
Author: Alexander Shtuchkin <ashtuchkin at gmail.com>
Date:   Mon May 7 23:04:07 2012 +0400

    Updated performance benchmark.
---
 README.md          | 14 +++++++++-----
 test/perfomance.js | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 66 insertions(+), 5 deletions(-)

diff --git a/README.md b/README.md
index b226161..fc6c1b6 100644
--- a/README.md
+++ b/README.md
@@ -3,9 +3,10 @@ iconv-lite - pure javascript character encoding conversion
 
 ## Features
 
+*   Pure javascript. Doesn't need native code compilation.
 *   Easy API.
-*   Works on Windows and in sandboxed environments like [Cloud9](http://c9.io) (doesn't need native code compilation).
-*   Faster than iconv (see below for performance comparison).
+*   Works on Windows and in sandboxed environments like [Cloud9](http://c9.io).
+*   Encoding is faster than node-iconv, decoding slightly slower (see below for performance comparison).
 
 ## Usage
 
@@ -33,12 +34,12 @@ Not supported yet: Big5, EUC family, Shift_JIS.
 
 ## Encoding/decoding speed
 
-Comparison with iconv module (1000 times 256kb, on Core i5/2.5 GHz).
+Comparison with node-iconv module (1000 times 256kb, on Core i5/2.5 GHz, Node v0.6.17).
 
     operation             iconv       iconv-lite (this module)
     ----------------------------------------------------------
-    encode('win1251')     19.57 mb/s  49.04 mb/s
-    decode('win1251')     16.39 mb/s  24.11 mb/s
+    encode('win1251')     ~30 Mb/s    ~45 Mb/s
+    decode('win1251')     ~33 Mb/s    ~27 Mb/s
 
 
 ## Notes
@@ -49,6 +50,9 @@ Untranslatable characters are set to � or ?. No transliteration is currently s
 
     npm install --dev iconv-lite
     vows
+    
+    # To view performance:
+    node test/performance.js
 
 ## TODO
 
diff --git a/test/perfomance.js b/test/perfomance.js
new file mode 100644
index 0000000..7d75d1f
--- /dev/null
+++ b/test/perfomance.js
@@ -0,0 +1,57 @@
+
+var iconv = require('iconv');
+var iconv_lite = require("../index");
+
+var encoding = "windows-1251";
+var convertTimes = 1000;
+
+// Test encoding.
+var str = "This is a test string 32 chars..";
+for (var i = 0; i < 13; i++)
+    str = str + str;
+
+console.log("\nEncoding "+str.length+" chars "+convertTimes+" times:");
+
+var start = Date.now();
+var converter = new iconv.Iconv("utf8", encoding);
+for (var i = 0; i < convertTimes; i++) {
+    var b = converter.convert(str);
+}
+var duration = Date.now() - start;
+var mbs = convertTimes*str.length/duration/1024;
+
+console.log("iconv: "+duration+"ms, "+mbs.toFixed(2)+" Mb/s.");
+
+var start = Date.now();
+for (var i = 0; i < convertTimes; i++) {
+    var b = iconv_lite.encode(str, encoding);
+}
+var duration = Date.now() - start;
+var mbs = convertTimes*str.length/duration/1024;
+
+console.log("iconv-lite: "+duration+"ms, "+mbs.toFixed(2)+" Mb/s.");
+
+
+// Test decoding.
+var buf = iconv_lite.encode(str, encoding);
+console.log("\nDecoding "+buf.length+" bytes "+convertTimes+" times:");
+
+var start = Date.now();
+var converter = new iconv.Iconv(encoding, "utf8");
+for (var i = 0; i < convertTimes; i++) {
+    var s = converter.convert(buf).toString();
+}
+var duration = Date.now() - start;
+var mbs = convertTimes*buf.length/duration/1024;
+
+console.log("iconv: "+duration+"ms, "+mbs.toFixed(2)+" Mb/s.");
+
+var start = Date.now();
+for (var i = 0; i < convertTimes; i++) {
+    var s = iconv_lite.decode(buf, encoding);
+}
+var duration = Date.now() - start;
+var mbs = convertTimes*buf.length/duration/1024;
+
+console.log("iconv-lite: "+duration+"ms, "+mbs.toFixed(2)+" Mb/s.");
+

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