Linus Torvalds wrote: > > On Mon, 25 Apr 2005, Mike Taht wrote: > >>One difference is probably - mercurial appears to be using zlib's >>*default* compression of 6.... >> >>using zlib compression of 9 really impacts git... > > > I agree that it will hurt for big changes, but since I really do believe > that most changes are just a couple of files, I don't believe it matters > for those. > > I forget what the exact numbers were, but I did some timings on plain > "gzip", and it basically said that doing gzip on a medium-sized file was > not that different for -6 and -9. Why? Because most of the overhead was > elsewhere ;) Certainly not different in the overall numbers, but after trying gzip on a bunch of various source files on 32 bit CPUs, from P-II to Xeon, it looks as if after 7 the cpu jumps about 40% to 8, and another 30% to 9. Neither 8 nor 9 give any significant size improvement (< 2%). Again, this is 32 bit CPU and just the gzip component, reading from stdin and writing to stdout which I hope gets directory operations out of the time measure. Sample attached. -- -bill davidsen (davidsen@tmr.com) "The secret to procrastination is to put things off until the last possible moment - but no longer" -me Comp level 1 real 0m1.972s user 0m1.790s sys 0m0.098s -rw-r--r-- 1 davidsen 1792050 Apr 26 11:56 dummy.tar.gz Comp level 2 real 0m2.021s user 0m1.858s sys 0m0.097s -rw-r--r-- 1 davidsen 1737227 Apr 26 11:56 dummy.tar.gz Comp level 3 real 0m2.296s user 0m2.124s sys 0m0.095s -rw-r--r-- 1 davidsen 1697644 Apr 26 11:56 dummy.tar.gz Comp level 4 real 0m2.604s user 0m2.423s sys 0m0.099s -rw-r--r-- 1 davidsen 1593207 Apr 26 11:56 dummy.tar.gz Comp level 5 real 0m3.181s user 0m3.003s sys 0m0.087s -rw-r--r-- 1 davidsen 1549050 Apr 26 11:56 dummy.tar.gz Comp level 6 real 0m4.185s user 0m3.965s sys 0m0.089s -rw-r--r-- 1 davidsen 1531866 Apr 26 11:56 dummy.tar.gz Comp level 7 real 0m4.889s user 0m4.642s sys 0m0.096s -rw-r--r-- 1 davidsen 1524350 Apr 26 11:57 dummy.tar.gz Comp level 8 real 0m7.836s user 0m7.532s sys 0m0.085s -rw-r--r-- 1 davidsen 1513763 Apr 26 11:57 dummy.tar.gz Comp level 9 real 0m11.020s user 0m10.616s sys 0m0.092s -rw-r--r-- 1 davidsen 1511970 Apr 26 11:57 dummy.tar.gz - To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.htmlReceived on Wed Apr 27 02:21:33 2005
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