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.
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
--
Dhiru
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