Node.js ES6 Map crash after 15 million keys

gistfile1.txt

<--- Last few GCs --->

[4433:0x3dc6880]   104473 ms: Scavenge 2019.9 (2024.9) -> 2019.2 (2030.1) MB, 29.9 / 0.0 ms  (average mu = 0.297, current mu = 0.284) allocation failure 
[4433:0x3dc6880]   104641 ms: Scavenge 2022.8 (2030.1) -> 2021.0 (2031.1) MB, 25.6 / 0.0 ms  (average mu = 0.297, current mu = 0.284) allocation failure 
[4433:0x3dc6880]   104766 ms: Scavenge 2023.7 (2031.1) -> 2022.3 (2032.9) MB, 40.8 / 0.0 ms  (average mu = 0.297, current mu = 0.284) allocation failure 


<--- JS stacktrace --->

==== JS stack trace =========================================

    0: ExitFrame [pc: 0x136d539]
Security context: 0x2ea3b30808a1 <JSObject>
    1: set [0x2ea3b30864c1](this=0x209a093e9129 <Map map = 0xe84f1140ed1>,0x1cd6de945a59 <String[8]: 14586380>,0x1b9680b6b981 <Uint8Array map = 0xe84f1165191>)
    2: /* anonymous */ [0x3c605a883439] [/home/jhuckaby/megahash/bench-es6map-reads.js:~1] [pc=0x2d1e8010fcc6](this=0x3c605a8834d1 <Object map = 0xe84f1140431>,0x3c605a8834d1 <Object map = 0xe84f1140431>,0...

FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory
 1: 0x9d33e0 node::Abort() [node]
 2: 0x9d4596 node::OnFatalError(char const*, char const*) [node]
 3: 0xb32dbe v8::Utils::ReportOOMFailure(v8::internal::Isolate*, char const*, bool) [node]
 4: 0xb33139 v8::internal::V8::FatalProcessOutOfMemory(v8::internal::Isolate*, char const*, bool) [node]
 5: 0xcde455  [node]
 6: 0xcdeae6 v8::internal::Heap::RecomputeLimits(v8::internal::GarbageCollector) [node]
 7: 0xcea97a v8::internal::Heap::PerformGarbageCollection(v8::internal::GarbageCollector, v8::GCCallbackFlags) [node]
 8: 0xceb885 v8::internal::Heap::CollectGarbage(v8::internal::AllocationSpace, v8::internal::GarbageCollectionReason, v8::GCCallbackFlags) [node]
 9: 0xcecf2f v8::internal::Heap::HandleGCRequest() [node]
10: 0xc9bf14 v8::internal::StackGuard::HandleInterrupts() [node]
11: 0xfea7e7 v8::internal::Runtime_StackGuard(int, unsigned long*, v8::internal::Isolate*) [node]
12: 0x136d539  [node]
Aborted