Re: Where is the eln search path defined

["Alex Bennée" <alex.bennee@linaro.org>]

Andrea Corallo <akrl@sdf.org> writes:

> Alex Bennée <alex.bennee@linaro.org> writes:
>
>> Andrea Corallo <akrl@sdf.org> writes:
>>
>>> Alex Bennée <alex.bennee@linaro.org> writes:
>>>
>>>> Heh - so I patched pdumper to dump the variables at that point and
>>>> re-built:
>>>>
>>>>   dump_do_dump_relocation: installation_state:2  ivoncation_dir:
>>>>
>>>> and now the built emacs boots up fine. So I'm guessing there
>>>> must have been a stale pdumper.o that didn't get built for some reason.
>>>>
>>>> Sorry for the noise.
>>>
>>> Hi Alex,
>>>
>>> no issue.  Is very good somebody tests Aarch64, thanks for that!
>>
>> While on that subject is there any sort of benchmarking used to see if a
>> given arch is generating good code? Certainly on x86 I noticed a
>> speed-up in gnus but that is more subjective than objective.
>
> Hi Alex,
>
> I believe so far what we have is this:
>
> https://elpa.gnu.org/packages/elisp-benchmarks.html
>
> Note that you have to native compile by hand the tests because this
> package doesn't know about native compilation.

I did C-h f elisp-benchmark-run and navigated to the file and executed
(native-compile (buffer-file-name)) and waited for it to dump the .eln
filename. The results don't seem that impressive so I don't know if I
did something wrong or if libgccjit is just being poor on Aarch64. The
machine is a TX1 so the individual cores aren't supper powerful anyway
but I was hoping for better:

* Before Results (byte-compiled)

  | test           | non-gc avg (s) | gc avg (s) | gcs avg | tot avg (s) | tot avg err (s) |
  |----------------+----------------+------------+---------+-------------+-----------------|
  | bubble-no-cons |         217.03 |       0.00 |       0 |      217.03 |            2.66 |
  | bubble         |          91.18 |      53.77 |      68 |      144.95 |            3.37 |
  | dhrystone      |         289.30 |      85.21 |     106 |      374.51 |            3.80 |
  | fibn-rec       |         139.91 |       0.00 |       0 |      139.91 |            0.58 |
  | fibn-tc        |         164.23 |       0.00 |       0 |      164.23 |            4.53 |
  | fibn           |         189.61 |       0.00 |       0 |      189.61 |            2.42 |
  | inclist        |         281.67 |       0.00 |       0 |      281.67 |            5.13 |
  | listlen-tc     |         263.80 |       0.00 |       0 |      263.80 |           10.06 |
  | nbody          |          70.62 |      92.60 |     114 |      163.23 |            4.30 |
  | pidigits       |         180.40 |      64.86 |      62 |      245.26 |            3.08 |
  |----------------+----------------+------------+---------+-------------+-----------------|
  | total          |        1887.75 |     296.44 |     350 |     2184.19 |           14.67 |
  |                |                |            |         |             |                 |

* After Results (native-compiled)

  | test           | non-gc avg (s) | gc avg (s) | gcs avg | tot avg (s) | tot avg err (s) |
  |----------------+----------------+------------+---------+-------------+-----------------|
  | bubble-no-cons |         206.13 |       0.00 |       0 |      206.13 |            4.67 |
  | bubble         |          88.84 |      48.20 |      65 |      137.05 |            0.73 |
  | dhrystone      |         301.94 |      75.30 |     102 |      377.24 |            4.91 |
  | fibn-rec       |         143.44 |       0.00 |       0 |      143.44 |            3.26 |
  | fibn-tc        |         165.60 |       0.00 |       0 |      165.60 |            1.99 |
  | fibn           |         186.95 |       0.00 |       0 |      186.95 |            6.08 |
  | inclist        |         270.98 |       0.00 |       0 |      270.98 |            1.57 |
  | listlen-tc     |         248.98 |       0.00 |       0 |      248.98 |            5.37 |
  | nbody          |          71.46 |      82.83 |     110 |      154.30 |            2.88 |
  | pidigits       |         192.83 |      61.80 |      59 |      254.63 |            2.56 |
  |----------------+----------------+------------+---------+-------------+-----------------|
  | total          |        1877.15 |     268.14 |     336 |     2145.29 |           12.01 |


I guess it's time to start looking at the generated code?

-- 
Alex Bennée