performancecounter | 易学教程

Why won't my performance counters change?

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问题 I must be doing something very wrong here. I create a custom performance counter as follows: string counterCategory = "Test Category"; string counterName = "Test Counter"; if (!PerformanceCounterCategory.Exists(counterCategory)) { Console.WriteLine("Creating Counters"); CounterCreationDataCollection counterCreationDataCollection = new CounterCreationDataCollection(); counterCreationDataCollection.Add( new CounterCreationData(counterName, "Description", PerformanceCounterType.NumberOfItems32)

.net performance counter - Process(w3wp)\% Processor Time

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问题 During performance testing, I found that the values of Process(w3wp)\% Processor Time are greater than 100. Some values are 237.1436486 312.5338052 341.2373994 264.4097661 191.6237736 I thought this value represents the CPU usage by w3wp process. I don't understand why the value is greater than 100%. 回答1: If you have multiple cores it can go over 100, it's the sum of the processor usage for each processor (core, or virtual core) so over 100 is normal ( 100*numberOfCores is the nax). Use the

c# performanceCounter setting raw value of counter

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I am trying to c# PerformanceCounter Library part of System.Diagnostic. While setting the raw value of the counter using public long RawValue { set; get; } I was passing the Rawalue to 0. However I noticed that Maximum value of the counter was reset to a very large number. Previous value of the counter was 2 Can someone help me out and point out any mistake I might be making, here is my code using (PerformanceCounter ctr = new PerformanceCounter(Settings.Instance.SetSourceAppliacationName, counter.ToString(), false)) { if (incrementCounter) { ctr.IncrementBy(value); } else { ctr.RawValue =

Determining a computer's maximum hard drive data transfer rate programmatically with C#

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问题 I have written a small WPF widget using C# that displays the current CPU activity, RAM used and disk activity as three small percentage type bars. I have used the following PerformanceCounters for this: (diskCounter PerformanceCounter returns current total disk activity in bytes per second) private void InitialisePerformanceCounters() { cpuCounter = new PerformanceCounter("Processor", "% Processor Time", "_Total", true); totalRam = (int)(new Microsoft.VisualBasic.Devices.ComputerInfo()

Two TLB-miss per mmap/access/munmap

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问题 for (int i = 0; i < 100000; ++i) { int *page = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); page[0] = 0; munmap(page, PAGE_SIZE); } I expect to get ~100000 dTLB-store-misses in userspace, one per each iteration (Also ~100000 page-faults and dTLB-load-misses for kernel). Running following command, the result is roughly 2x what I expect. I would appreciate if someone could clarify why this is the case: perf stat -e dTLB-store-misses:u ./test Performance

corrupted performance counters?

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问题 Preformance counters are EVIL. don't use them. if(PerformanceCounterCategory.Exists("ILoveYou") ) // is true { PerformanceCounterCategory.Delete("ILoveYou"); //throws exception The **configuration registry** key is invalid } at System.Diagnostics.PerformanceCounterLib.RegisterFiles(String arg0, Boolean unregister) at System.Diagnostics.PerformanceCounterLib.UnregisterCategory(String categoryName) at System.Diagnostics.PerformanceCounterCategory.Delete(String categoryName) at

performance counter events associated with false sharing

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I am looking at the performance of OpenMP program, specifically cache and memory performance. I have found guidelines while back ago how to analyze performance with Vtune that mentioned which counters to watch out for. However now cannot seem to find the manual. If you know which manual I have in question or if you know the counters/events, please let me know. Also if you have other techniques for analyzing multithreaded memory performance, please share if you can Thanks Here is an article discussion this topic . The most common counters to examine are L2 cache misses and branch prediction

Service Model performance counters Instance Name

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I am trying to connect directly to the performance counters emitted by ServiceModel (for services, endpoints and operations). The problem is that when I try to correlate with a certain service (or endpoint/operation) I need to specified instance name of the counter. According to MSDN the pattern by which instance name is simple, however in certain cases when one of the components of the instance name (uri, contract name, etc.) is too long it’s shortened and hash code is added at either the beginning or the end of the string.The article doesn’t specify how it’s hashed. So my question is there a

Which perf events can use PEBS?

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问题 I want to understand which events can have the precise modifier on my CPU (Sandy Bridge). Intel Software Developer's Manual (Table 18-32. PEBS Performance Events for Intel Microarchitecture Code Name Sandy Bridge) contains only the following events: INST_RETIRED , UOPS_RETIRED , BR_INST_RETIRED , BR_MISP_RETIRED , MEM_UOPS_RETIRED , MEM_LOAD_UOPS_RETIRED , MEM_LOAD_UOPS_LLC_HIT_RETIRED . And SandyBridge_core_V15.json lists the same events with PEBS > 0. However there are some examples of

Perfmon can't create data collector set on Windows 7 x64

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I'm trying to create a data collector set using Perfmon. When I right click 'New -> Data Collector Set' in the User Defined folder, I see the wizard dialog appear. However, the 'Next' and 'Finish' buttons are disabled. All I can do is click on Cancel. Any ideas? Found the answer to this while googling a problem with the disk defragger. The recommendation I found was to (backup first!) remove the registry key: HKLM\Software\Microsoft\RPC\Internet I exported the key for a backup; deleted the key; then rebooted. After reboot I could run the disk defragger and also add my own data collector sets