performancecounter

问题 I'm looking for a way to get performance counters from Windows Performance monitor in Java program. I know it's pretty easy to get this counters in .NET or PowerShell. Who knows is it possible in Java? 回答1: See Access Windows Performance Monitor counters from Java: "For those running Java applications or services, the Windows Performance Monitor (WPM) contains a treasure trove of valuable information—see Figure 1. There are hundreds (or thousands) of performance statistics called counters

问题 I am trying to understand how does a branch prediction unit work in a CPU. I have used papi and also linux's perf-events but both of them do not give accurate results (for my case). This is my code: void func(int* arr, int sequence_len){ for(int i = 0; i < sequence_len; i++){ // region starts if(arr[i]){ do_sth(); } // region ends } } My array consists of 0's and 1's. It has a pattern with a size of sequence_len . For example, if my size is 8, then it has a pattern of 0 1 0 1 0 0 1 1 or

问题 I am trying to understand how does a branch prediction unit work in a CPU. I have used papi and also linux's perf-events but both of them do not give accurate results (for my case). This is my code: void func(int* arr, int sequence_len){ for(int i = 0; i < sequence_len; i++){ // region starts if(arr[i]){ do_sth(); } // region ends } } My array consists of 0's and 1's. It has a pattern with a size of sequence_len . For example, if my size is 8, then it has a pattern of 0 1 0 1 0 0 1 1 or

问题 I am trying to understand how does a branch prediction unit work in a CPU. I have used papi and also linux's perf-events but both of them do not give accurate results (for my case). This is my code: void func(int* arr, int sequence_len){ for(int i = 0; i < sequence_len; i++){ // region starts if(arr[i]){ do_sth(); } // region ends } } My array consists of 0's and 1's. It has a pattern with a size of sequence_len . For example, if my size is 8, then it has a pattern of 0 1 0 1 0 0 1 1 or

问题 I'm using Powershell to return values for certain performance counters, and I'm seeing that it is referring to "Cookedvalues" when presenting the information. I'm looking for each counter hit to be reported on it's own, so I can do analysis like seeing the 90th percentile values or max/min, so I need to know how it is arriving at Cooked Value. Here is the code I am currently working with: $computer = $ENV:Computername $instance = "_total" @("\\$Computer\PhysicalDisk(*)\Current Disk Queue

问题 Is there a perf stat equivalent on Mac OS? I would like to do the same thing for a CLI command and googling is not yielding anything. 回答1: There was Instruments tool in Mac OS X to profile applications including with hardware PMU. Default is to do sampling profiler for CPU usage. Some docs: https://en.wikipedia.org/wiki/Instruments_(software) https://help.apple.com/instruments/mac/current/ It also has command line variant: https://help.apple.com/instruments/mac/current/#/devb14ffaa5 Open

问题 Is there a perf stat equivalent on Mac OS? I would like to do the same thing for a CLI command and googling is not yielding anything. 回答1: There was Instruments tool in Mac OS X to profile applications including with hardware PMU. Default is to do sampling profiler for CPU usage. Some docs: https://en.wikipedia.org/wiki/Instruments_(software) https://help.apple.com/instruments/mac/current/ It also has command line variant: https://help.apple.com/instruments/mac/current/#/devb14ffaa5 Open

问题 [My Attempts] Already went through How to get the CPU Usage in C#? But "_Total" Instance of Processor would give me total consumption of CPU as opposed to specifc application or 'process' In a C# Program, I am trying to get the CPU usage percentage of the application but it always shows 100 What exactly is CPU Time in task manager? , explains it but does not say how to retrive this value. After referring http://social.technet.microsoft.com/wiki/contents/articles/12984.understanding-processor

来源： https://stackoverflow.com/questions/11636064/performance-counters-performance-category-creation-error

来源： https://stackoverflow.com/questions/11636064/performance-counters-performance-category-creation-error