Windows 98 System Resource Meter Explained

In Microsoft Windows 98, the primary utility that allowed users to view system resource usage percentages was the Resource Meter (Rsrcmtr.exe). This article explains what the Resource Meter was, how it tracked vital operating system resources, how users accessed it, and why monitoring these percentages was critical for system stability in the Windows 9x era.

What Was the Resource Meter?

Windows 98 relied on an architecture derived from Windows 95 and Windows 3.1, which allocated specific, fixed-size 16-bit memory heaps for graphical components and interface management. Even if a computer had substantial physical RAM, exhausting these specific heaps would cause the system to freeze or crash with "Out of Memory" errors.

The Resource Meter was a lightweight background utility designed specifically to monitor these heaps in real time. When running, it placed a small gauge icon in the system notification area (system tray) that changed color—shifting from green to yellow, and finally red—as available resources dwindled.

The Three Monitored Resources

Double-clicking the system tray icon opened a dialog box displaying three distinct percentage bars:

  1. System Resources: Represented the overall resource availability, reflecting whichever of the two main heaps (User or GDI) had the lowest percentage remaining.
  2. User Resources: Tracked memory allocated for window management, dialog boxes, menus, and user input controls.
  3. GDI Resources: Tracked the Graphical Device Interface heap, which handled fonts, icons, bitmaps, brushes, and other visual rendering elements.

Each category showed the percentage of free heap space remaining. If any of these values dropped below approximately 10% to 15%, the system became unstable, prompting users to close applications to free up heap space.

How to Access the Resource Meter

The Resource Meter was an optional accessory included on the Windows 98 installation media. Users could launch it by following this path:

  1. Click the Start button.
  2. Navigate to Programs > Accessories > System Tools.
  3. Select Resource Meter.

Alternatively, users could open the Run dialog (Windows Key + R) and type rsrcmtr to launch the utility directly.

Complementary Utility: System Monitor

While the Resource Meter specialized in tracking fixed heap percentages, Windows 98 also included System Monitor (Sysmon.exe). Located in the same System Tools folder, System Monitor provided real-time line graphs and numerical data for broader hardware statistics, including actual processor usage, allocated physical memory, disk cache size, and swap file activity.