rel=me » json http://rel.me programming, objective-c, cocoa, iphone, c Wed, 01 Feb 2012 07:26:50 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 JSON Parsing Speed Test: YAJL vs SBJSON (iPhone Edition) http://rel.me/2009/10/08/json-parsing-speed-test-yajl-vs-sbjson-iphone/ http://rel.me/2009/10/08/json-parsing-speed-test-yajl-vs-sbjson-iphone/#comments Fri, 09 Oct 2009 06:18:57 +0000 gabe http://rel.me/?p=255 I was curious about the difference, if any, in performance between SBJSON and YAJL with Objective-C bindings. SBJSON is a strict JSON parser written in Objective-C. YAJL is a small event-driven (SAX-style) JSON parser written in ANSI C. Awhile back I wrote YAJL Objective-C bindings and I did some very basic speed tests on JSON data from twitter, delicious, last.fm and yelp. I ran these tests on the original, 3G and 3GS iPhones.

The SBJSON test ran NSString#JSONValue, and the equivalent YAJL test ran NSData#yajl_JSON. The YAJL bindings operate directly on NSData, and this makes a bit more sense since we usually have NSData first, whereas for SBJSON you have to decode to a string before parsing. I didn’t include this difference in my tests though.

These are tests of parsing only (and not loading of any data or strings) of the 4 APIs datasets run 100 times on the original iPhone, 3G and 3GS:

iphone

iphone3g

iphone3gs

So the YAJL framework gives about a 60% speed increase. The YAJL Objective-C bindings can be found on github.

Be sure to thank @lloydhilaiel for making YAJL full of so much awesomeness.

Update: The project used to do the perf test can be found here.

]]> http://rel.me/2009/10/08/json-parsing-speed-test-yajl-vs-sbjson-iphone/feed/ 2 YAJL JSON Parser (Objective-C Bindings) http://rel.me/2009/06/15/yajl-json-parser-objective-c-bindings/ http://rel.me/2009/06/15/yajl-json-parser-objective-c-bindings/#comments Mon, 15 Jun 2009 07:27:18 +0000 gabe http://rel.me/?p=238 I recently was investigating using a more lightweight JSON parser for iPhone projects (other than the standard SBJSON library) and came across the YAJL C JSON library. While using it as a document style parser didn’t result in a huge performance gain, it does a support a streaming “SAX” style parser which might help memory usage in larger documents.

Hopefully, sometime soon I will do some performance comparisons. In the meantime, if you try these bindings, let me know how it goes. You can find it on github at: http://github.com/gabriel/yajl-objc.

Right now, I only have a framework (for 10.5) built, but check back and at some point will have a static iPhone library built as well.

Here are some quick usage examples:

Usage

Usage (Streaming)

Usage (Document style)

Updated (07/01/2009): Updated usage to use new API changes for better streaming support.

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