I would start by figuring out where there is room for improvement. Experiments to do:
- how long does it take to just iterate over all bytes in the file?
- how long does it take to decompress the file and iterate over all bytes in the file?
To ensure the compiler doesn’t outsmart you, you may have to do something with the data read. Maybe XOR all 64-bit longs in the data and print the result?
You don’t mention file size but I guess the first takes significantly less time than 45 seconds, and the second about 45 seconds. If so, any gains should be sought in improving the decompression.
Other tests that can help locate the bottleneck are possible. For example, instead of processing a huge N megabyte file once, you may process a 1 MB file N times, removing disk speed from the equation.
- how long does it take to just iterate over all bytes in the file?
- how long does it take to decompress the file and iterate over all bytes in the file?
To ensure the compiler doesn’t outsmart you, you may have to do something with the data read. Maybe XOR all 64-bit longs in the data and print the result?
You don’t mention file size but I guess the first takes significantly less time than 45 seconds, and the second about 45 seconds. If so, any gains should be sought in improving the decompression.
Other tests that can help locate the bottleneck are possible. For example, instead of processing a huge N megabyte file once, you may process a 1 MB file N times, removing disk speed from the equation.