On 09/09/2011 11:44 PM, Dmitry Olshansky wrote:
On 10.09.2011 0:55, Timon Gehr wrote:
On 09/09/2011 10:30 PM, Timon Gehr wrote:
void main(){
mixin({
string r;
foreach(i;0..12000) r~=q{mixin(q{{enum x="";}});};
return r;
}());
}
When I compile this program, DMD sometimes uses about 1GB of memory,
sometimes about 2GB of memory and sometimes it makes my OS crash.
Can anyone reproduce this?
Similarly this:
template TT(string s){enum TT=s;}
void main(){
mixin({
string r;
foreach(i;0..12000) r~=q{{enum x=TT!"";};};
return r;
}());
}
That does use a somewhat smaller amount of memory, but it is still huge
and non-deterministic in size.
I guess issue 6498, i.e. it's CTFE doing memory allocation on each
append in foreach loop.
http://d.puremagic.com/issues/show_bug.cgi?id=6498
Well, I don't get the issue if I don't mixin mixins or template
instantiations.
void main(){
mixin({
string r;
foreach(i;0..12000) r~="{}{}{}{}{}{}{}{}";
return r;
}());
}
As for as non-determinism, maybe heap fragmentation?
That might well be it. Thanks!
