the prelink default should be banned from the distribution because this is always the excuse not activate hardening-flags for packages because PIE binaries are not prelinked and people still insist it brings great performance gains which is mostly not true Am 15.10.2013 14:19, schrieb Dhiru Kholia: > 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. > > In short, we could not distinguish the performance gains of prelink over > the "background noise" in many (or even most) cases. > > So, I was wondering if you are aware of any use-cases where prelink > provides measurable benefits. In would be awesome if you could run > "unSPEC" on your systems and report back the numbers. > > "unSPEC" is easy to use and doesn't take much time (or steps) to run. > For more information, please see the following links. > > References: > > [1] https://github.com/kholia/unSPEC > [2] https://github.com/kholia/unSPEC/tree/master/LibreOffice > [3] https://github.com/kholia/unSPEC/tree/master/kernel-bench
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