Re: [PATCH 1/2] Prevent excessive major gcs by having decent amount of unused heap

[Sven Hartrumpf]

Mario, 2021-01-10 10:03:
> Hi Sven,
>
> On Sat, 09 Jan 2021 15:14:31 +0100 (CET) Sven Hartrumpf <hartrumpf@gmx.net> 
> wrote:
>
>> Thanks for the patches and the tests!
>>
>>> I ran a relatively extensive set of benchmark configurations comparing
>>> CHICKEN from master against CHICKEN from master plus the patches.
>>
>> I would like to run some real-world benchmarks.
>> They are dynamically linked.
>> Would it be enough to run them with the different libchicken.so.11 versions
>> (before and after GC patch) or should I recompile my programs?
>
> If your binaries are dynamically linked and use a version of CHICKEN
> which is ABI-compatible with the code in master (ABI version 11),
> switching libchicken.so (e.g., via LD_LIBRARY_PATH) without recompiling
> your code should do the trick.
>
> If you can, please let us know about your benchmark results.

The results for x86-64 show improvements (- 2 % run time);
for i586 and x32, the results show slowdowns (+ 1-2 % run time):

GC     arch.   avg. runtime in ms

old gc x86-64  615
new gc x86-64  601

old gc x32     505
new gc x32     509

old gc i586    728
new gc i586    739

(My benchmark is a semantic natural language parser, which is GC-intensive.
C compiler is gcc 9.3.0 from Ubuntu 20.10.)

Maybe the changes are somewhat biased for x86-64 and
could be adjusted for i586 and x32?

Ciao
Sven