dart print out memory usage

mem_usage.dart

import 'dart:developer' as developer;

import 'package:intl/intl.dart';

// https://pub.dev/packages/vm_service
import 'package:vm_service/vm_service.dart' show MemoryUsage, VM, VmService;
import 'package:vm_service/vm_service_io.dart' show vmServiceConnectUri;


Future<void> printHeapUsage() async {
  MemoryUsage mem = await getMemoryUsage();
  print(NumberFormat.compact().format(mem.heapUsage));
}

Future<MemoryUsage> getMemoryUsage() async {
  developer.ServiceProtocolInfo info = await developer.Service.getInfo();
  VmService service =
      await vmServiceConnectUri(info.serverWebSocketUri.toString());
  VM vm = await service.getVM();
  String? isolateId = vm.isolates?.first.id;
  MemoryUsage mem;
  if (isolateId == null) {
    mem = MemoryUsage(externalUsage: 0, heapCapacity: 0, heapUsage: 0);
  } else {
    mem = await service.getMemoryUsage(isolateId);
  }
  return mem;
}

Be sure to call service.dispose() otherwise each call will leak a socket descriptor (i.e., OS Error: Too many open files, errno = 24 on iOS).