On 5/28/07, Adrian Bunk <[EMAIL PROTECTED]> wrote:
On Mon, May 28, 2007 at 08:10:31PM +0530, Nitin Gupta wrote: > Hi, > > Attached is tester code used for testing. > (developed by Daniel Hazelton -- modified slightly to now use 'take 6' > version for 'TinyLZO') > > Cheers, > Nitin > > On 5/28/07, Nitin Gupta <[EMAIL PROTECTED]> wrote: >> (Using tester program from Daniel) >> >> Following compares this kernel port ('take 6') vs original miniLZO code: >> >> 'TinyLZO' refers to this kernel port. >> >> 10000 run averages: >> 'Tiny LZO': >> Combined: 61.2223 usec >> Compression: 41.8412 usec >> Decompression: 19.3811 usec >> 'miniLZO': >> Combined: 66.0444 usec >> Compression: 46.6323 usec >> Decompression: 19.4121 usec >> >> Result: >> Overall: TinyLZO is 7.3% faster >> Compressor: TinyLZO is 10.2% faster >> Decompressor: TinyLZO is 0.15% faster
So your the compressor of your version runs 10.2% faster than the original version. That's a huge difference. Why exactly is it that much faster? cu Adrian
I am not sure on how to account for this _big_ perf. gain but from benchmarks I see that whenever I remove unncessary casting from tight loops I get perf. gain of 1-2%. For e.g. open coding LZO_CHECK_MPOS_NON_DET macro with all unnecessary casting removed, gave perf. gain of ~2%. Similarly, I found many other places where such casting was unnecessary. These changes have been tested on x86, amd64, ppc. Testing of 'take 6' version is yet to be done - this will confirm that I didn't reintroduce some error. - Nitin - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
