Conclusion

The ostensible performance improvements of a 64-bit compile are a mixed bag in the compressors tested. Those compressors which saw improvement may not even owe that improvement to the 64-bitness of the program, but rather to some other optimization (SSE2, for instance) that is part and parcel of a 64-bit compilation, but not necessarily of a stock Win32 compile.

Here’s a summary of the average change for each compressor.

Performance difference averages
Compressor Avg. Difference (%)
BCM -4.525%
WinRAR 1.429%
SBC -17.875%
MComp -5.966%
Balz 29.843%
NanoZip -11.684%
7-Zip 7.763%
BZip2 -15.626%
GZip -16.298%
QPress 3.619%

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§4991 · March 6, 2010 · Tags: , , ·

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