On Tue, Oct 15, 2013 at 5:19 AM, Dhiru Kholia <dhiru.kholia@xxxxxxxxx> wrote: > Hi, > > During the development of "unSPEC" [1] benchmarking suite, I made some > interesting observations regarding prelink. > > - Here are some measurements (for LibreOffice [2] loading time in > seconds) done using the "unSPEC" benchmarking suite. These numbers > are repeatable and you are encouraged to try "unSPEC" to do > independent validation of these numbers. > > - hkario (modern SSD based system, cache flushed): (1.816, 1.811, 1.797, > 1.827 with prelink), (2.034, 2.042, 2.027, 2.016 without prelink) > > - hkario (modern SSD based system, cache intact): (2.155, 2.121, 2.101, 2.299 > with prelink), (2.311, 2.052, 2.047, 2.037 without prelink) > > - halfie (T430s): (10.725, 10.095, 10.378, 10.568 with prelink), (8.901, > 8.993, 9.075, 9.448, 9.489 without prelink) > > - danpb (T530): I see basically no measurable difference in times with or > without prelink - quite a lot of variation, but all in same ballpark, > (8.374, 7.849, 8.457, 7.673, 7.608, 8.031, 8.350, 8.183, 7.381 with > prelink), (7.366, 8.009, 7.500, 7.949, 8.208, 8.351, 7.849, without > prelink). > > - For building kernels (using the "kernel-bench" [3] component of unSPEC > suite), prelink saved <= 250 ms over the non-prelink environment > (which took 1m19.138s). hkario even reports worse performance numbers > for the prelink environment. Additionally, we have specialized > softwares like ccache and distcc to solve long-compilation-time > problems. I wouldn't expect building kernels to be a great thing to use to measure performance benefits of prelink. A kernel build is basically just calling gcc and ld over and over, and those two things themselves have relatively few libraries involved. So your numbers match what I would expect in this case, but I don't think it's really and accurate testcase. Prelink isn't intended to reduce compilation times. josh -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct
