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copied!<p>For future users, here is what I had to do to make sure to get the Private Working Set for processes that might have multiple instances. I call <code>CurrentMemoryUsage</code>, which gets the appropriate process name from <code>GetNameToUseForMemory</code>. I found this loop to be slow, even with filtering down the results where I could. So, that is why you see <code>GetNameToUseForMemory</code> using a dictionary for caching the name.</p> <pre><code>private static long CurrentMemoryUsage(Process proc) { long currentMemoryUsage; var nameToUseForMemory = GetNameToUseForMemory(proc); using (var procPerfCounter = new PerformanceCounter("Process", "Working Set - Private", nameToUseForMemory)) { //KB is standard currentMemoryUsage = procPerfCounter.RawValue/1024; } return currentMemoryUsage; } private static string GetNameToUseForMemory(Process proc) { if (processId2MemoryProcessName.ContainsKey(proc.Id)) return processId2MemoryProcessName[proc.Id]; var nameToUseForMemory = String.Empty; var category = new PerformanceCounterCategory("Process"); var instanceNames = category.GetInstanceNames().Where(x => x.Contains(proc.ProcessName)); foreach (var instanceName in instanceNames) { using (var performanceCounter = new PerformanceCounter("Process", "ID Process", instanceName, true)) { if (performanceCounter.RawValue != proc.Id) continue; nameToUseForMemory = instanceName; break; } } if(!processId2MemoryProcessName.ContainsKey(proc.Id)) processId2MemoryProcessName.Add(proc.Id, nameToUseForMemory); return nameToUseForMemory; } </code></pre>

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