Re: Question about bignum usage

[Gerd Möllmann]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Gerd Möllmann <gerd.moellmann@gmail.com>
>> Cc: emacs-devel@gnu.org
>> Date: Thu, 20 Jun 2024 08:34:22 +0200
>> 
>> Eli Zaretskii <eliz@gnu.org> writes:
>> 
>> > Why not?  Time values are known to produce bignums, yes.  
>> 
>> Ok.
>> 
>> > What does list-timers show on that system?
>> 
>>                1.0s         5.0s auto-revert-buffers
>>                5.4s            - undo-auto--boundary-timer
>>            4m 19.0s           5m persistent-scratch-save
>>    *           0.1s            t show-paren-function
>>    *           0.5s            t posframe-hidehandler-daemon-function
>>    *           0.5s            t #f(compiled-function () #<bytecode 
>> -0x181a979fe3c9ba30> [jit-lock--antiblink-grace-timer 
>> jit-lock-context-fontify])
>>    *           0.5s      :repeat blink-cursor-start
>>    *           1.0s            t which-key--update
>
> This means we check for expired times every 100 msec, so yes, we will
> create a lot of bignums.  I see something similar here as well.

Thanks.

It isn't a problem, one just have to know why it happens.

In igc, these bignums accumulate pretty quickly to figures like

  PVEC_BIGNUM                              97199         3110368

and much higher, where the first number is the number of bignums, and
the second is bytes. The number of fonts is also curious.

  PVEC_FONT                                90422        10868392

But all seem to be GC'd eventually.