[Issue 150] std.gc.minimize doesn't minimize physical memory usage

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=150



--- Comment #8 from Leandro Lucarella <leandro.lucarella at sociomantic.com> 2012-01-19 02:20:34 PST ---
BTW, seems to be working:

---

~/dmd/dmd-1.072/dmd/src/phobos:phobos-1.x %=$ ./dmd | head -n1
DMD64 D Compiler v1.072
~/dmd/dmd-1.072/dmd/src/phobos:phobos-1.x %=$ cat test.d 
import std.gc;
import std.stdio;
import gcstats;

extern(C) GCStats gc_stats();

void printGC(){
    GCStats stat;
    getStats(stat);

    writefln("poolsize: %s; usedsize: %s; freeblocks: %s; freelistsize: %s;
pageblocks: %s\n",
        stat.poolsize, stat.usedsize, stat.freeblocks, stat.freelistsize,
stat.pageblocks);
}

int main(){
    printGC();

    size_t len = 256 * 1024 * 1024;
    auto b = new byte[len];

    writefln("after allocating %s bytes", len);
    printGC();

    delete b;
    b = null;

    std.gc.fullCollect();
    writefln("after std.gc.fullCollect:");
    printGC();

    std.gc.minimize();
    writefln("after std.gc.minimize:");
    printGC();

    return 0;
}
~/dmd/dmd-1.072/dmd/src/phobos:phobos-1.x %=$ ./dmd -run test
poolsize: 65536; usedsize: 512; freeblocks: 14; freelistsize: 7680;
pageblocks: 0

after allocating 268435456 bytes
poolsize: 268566528; usedsize: 512; freeblocks: 29; freelistsize: 7680;
pageblocks: 1

after std.gc.fullCollect:
poolsize: 268566528; usedsize: 512; freeblocks: 65566; freelistsize: 7680;
pageblocks: 0

after std.gc.minimize:
poolsize: 65536; usedsize: 512; freeblocks: 14; freelistsize: 7680;
pageblocks: 0

---

If you want to run a minimize() after a collection, apply this pull request:
https://github.com/D-Programming-Language/phobos/pull/397

After the patch:

---

poolsize: 65536; usedsize: 512; freeblocks: 14; freelistsize: 7680;
pageblocks: 0

after allocating 268435456 bytes
poolsize: 268566528; usedsize: 512; freeblocks: 29; freelistsize: 7680;
pageblocks: 1

after std.gc.fullCollect:
poolsize: 65536; usedsize: 512; freeblocks: 14; freelistsize: 7680;
pageblocks: 0

after std.gc.minimize:
poolsize: 65536; usedsize: 512; freeblocks: 14; freelistsize: 7680;
pageblocks: 0

---

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