The app hanging after reach 1750MB of RAM

[Suliman via Digitalmars-d-learn]

I have added GC.stat 
https://dlang.org/library/core/memory/gc.stats.html here the 
result:

freeSize: 49698640  | usedSize: 170502320
freeSize: 41174592  | usedSize: 217823680
freeSize: 53868576  | usedSize: 247072736
freeSize: 86494800  | usedSize: 307769776
freeSize: 58176640  | usedSize: 499665792
freeSize: 148233232 | usedSize: 534389744
freeSize: 148141376 | usedSize: 534481600
freeSize: 108467312 | usedSize: 641264528
freeSize: 55118432  | usedSize: 694613408
freeSize: 80579472  | usedSize: 803370096
freeSize: 78444480  | usedSize: 1006831680
freeSize: 291629360 | usedSize: 860755664
freeSize: 242912736 | usedSize: 976581152
freeSize: 241673232 | usedSize: 977820656
freeSize: 168092160 | usedSize: 1118510592
freeSize: 128405616 | usedSize: 1426632592
freeSize: 73146272  | usedSize: 1616109664
freeSize: 17962320  | usedSize: 1671293616
freeSize: 20342912  | usedSize: 1736021888

on the last value app is hanging.