getVirtualMemorySize() returns RangeError on release mode

[pizzaldi]

As the title said, the getVirtualMemorySize() function returns this exception error when run on release mode:

RangeError (length): Invalid value: Only valid value is 0: 1

However, it works fine on debug mode and I can retrieve the virtual memory size successfully.

More details:
Flutter version: 3.16.9
Device: Samsung Galaxy A03 with Android 13

[igorvidottof]

Same here...

[JeroenKoster]

Ran into the same issue. Decided to create my own util because I was only interested in Android anyways.

For whoever's interested:

import 'dart:io';

class MemoryInfo {
  final int totalPhysicalMemoryMB;
  final int freePhysicalMemoryMB;
  final int totalVirtualMemoryMB;
  final int freeVirtualMemoryMB;
  final int virtualMemorySizeMB;

  MemoryInfo({
    required this.totalPhysicalMemoryMB,
    required this.freePhysicalMemoryMB,
    required this.totalVirtualMemoryMB,
    required this.freeVirtualMemoryMB,
    required this.virtualMemorySizeMB,
  });

  @override
  String toString() {
    return '''---------   MEMORY INFO   ----------
  Total physical memory   : $totalPhysicalMemoryMB MB
  Free physical memory    : $freePhysicalMemoryMB MB
  Total virtual memory    : $totalVirtualMemoryMB MB
  Free virtual memory     : $freeVirtualMemoryMB MB
  Virtual memory size     : $virtualMemorySizeMB MB
------------------------------------''';
  }
}

class MemoryUtil {
  static Future<MemoryInfo> getMemoryInfo() async {
    if (Platform.isAndroid || Platform.isLinux) {
      final meminfo = await File('/proc/meminfo').readAsLines();
      final values = <String, int>{};

      for (final line in meminfo) {
        final parts = line.split(RegExp(r'\s+'));
        if (parts.length >= 2) {
          final key = parts[0].replaceAll(':', '');
          final value = int.parse(parts[1]) ~/ 1024; // Convert kB to MB
          values[key] = value;
        }
      }

      final physicalFree = values['MemFree'] ?? 0;
      final swapFree = values['SwapFree'] ?? 0;
      final totalPhysical = values['MemTotal'] ?? 0;
      final totalSwap = values['SwapTotal'] ?? 0;

      // Get process-specific virtual memory size
      final vmSize = int.parse(
            File('/proc/self/status').readAsLinesSync().firstWhere((line) => line.startsWith('VmSize:')).split(RegExp(r'\s+'))[1],
          ) ~/
          1024; // Convert kB to MB

      return MemoryInfo(
        totalPhysicalMemoryMB: totalPhysical,
        freePhysicalMemoryMB: physicalFree,
        totalVirtualMemoryMB: totalPhysical + totalSwap,
        freeVirtualMemoryMB: physicalFree + swapFree,
        virtualMemorySizeMB: vmSize,
      );
    }
    throw UnsupportedError('Unsupported platform');
  }
}

 print(memoryInfo);

I/flutter (13430): ---------   MEMORY INFO   ----------
I/flutter (13430):   Total physical memory   : 7455 MB
I/flutter (13430):   Free physical memory    : 951 MB
I/flutter (13430):   Total virtual memory    : 11550 MB
I/flutter (13430):   Free virtual memory     : 4281 MB
I/flutter (13430):   Virtual memory size     : 37685 MB
I/flutter (13430): ------------------------------------