On 06/02/2021 3:32 PM, frame wrote:
On Friday, 5 February 2021 at 22:46:05 UTC, Bastiaan Veelo wrote:
?? Do you mean no collections happen? 32bit GC should just work.
No, it doesn't - this code fails on memory allocation and works fine
with -m64 switch:
import std.stdio;
import core.memory : GC;
void main() {
void usage() {
writefln("Usage: %.2f MiB / collected: %d", (cast(double)
GC.stats.usedSize) / 1_048_576, GC.profileStats.numCollections);
}
void foo() {
string[] s;
scope (exit) {
s.length = 0;
This won't do anything.
}
foreach (i; 0 .. 50_000_00) {
s ~= "a";
}
}
foreach (i; 0 .. uint.max) {
writefln("Round: %d", i + 1);
Don't forget to stdout.flush; Otherwise stuff can get caught in the
buffer before erroring out.
foo();
GC.collect();
usage();
}
}
...
Round: 24
Usage: 1603.57 MiB / collected: 27
Round: 25
Usage: 1691.64 MiB / collected: 28
Round: 26
Usage: 1729.50 MiB / collected: 29
Round: 27
core.exception.OutOfMemoryError@src\core\exception.d(647): Memory
allocation failed
Turn on the precise GC, 32bit is a bit too small of a range and you can
get false positives like in this case (at least looks like it).
