Re: 64-bit emacs crashes a lot

[Ken Brown <kbrown@cornell.edu>]

On 8/17/2013 6:23 PM, Angelo Graziosi wrote:
> Il 17/08/2013 22.16, Ken Brown ha scritto:
>>
>> This probably means that the static heap isn't big enough for
>> --enable-checking=all on 32-bit Cygwin.  I'll test it and increase it if
>> necessary.  I may not get to this today, but I'll do it soon.  (And you
>> can do it yourself locally if you're anxious to bootstrap right now.)
>
> OK, with 18MB it is still bootstrapping and has printed:
>
> ...
> Finding pointers to doc strings...done
> Dumping under the name emacs
> Static heap usage: 16099796 of 18874368 bytes
> ...
>
> but... really should we increase the static heap from 13 to 18 MB also
> for a not-checking bootstrap?

No.  I made the increase to 18 conditional on ENABLE_CHECKING.

> Usually, in that case, the build log shows
>
> ...
> Static heap usage: 10273280 of 13631488 bytes
> ...
> Static heap usage: 5419520 of 13631488 bytes
>
>
> Doesn't it mean that the "end" product uses only about 5.2 MB?

Yes, but you still need a bigger static heap for bootstrapping.  While 
bootstrap-emacs is being built, many *.el files get loaded, and this 
requires a large static heap.  Then bootstrap-emacs byte-compiles those 
files.  Now when emacs is built, the smaller *.elc files can be used, so 
a smaller static heap suffices for that second step.

By the way, it just occurred to me that the "static heap usage" report 
isn't very informative.  It shows how much of the static heap is in use 
at the time emacs (or bootstrap-emacs) is dumped, but there might have 
been more in use and then freed at some earlier stage.  I changed 
sheap.c:report_sheap_usage so that it reports the maximum usage, since 
this is what determines how big the static heap needs to be.

Ken