performancecounter

问题 I write some function in my OS kernel to issue the performance monitoring interrupt (PMI) on instructions counter overflow. It works well on my machine (Intel core i5). But when I run it on qemu using qemu-system-x86_64 -enable-kvm -cpu host -m 256 -serial mon:stdio -cdrom var/run/hypervisor.iso the interrupt does never fire. Is there anything I am missing? Does it require any special configuration to get the PMI fired on qemu? I recall that instruction counting works well in qemu. msr

问题 I am recording a performance counters frm linux using the command perf record. I want to use the result perf.data as an input to other programming apps. Do you know how shall I read and parse the data in perf.data ? Is there a way to transform it to .text file or .csv ? 回答1: An example command definition that redirects service check performance data to a text file for later processing by another application is shown below: define command{ command_name store-service-perfdata command_line /bin

问题 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 回答1: Here is an

问题 I'm working on a charge balancing system and thus I need to know the charge of each machine. PerformanceCounter seem the way to go, but creating the first one take between 38 and 60 sec. Each subsequent new Counter or 'NextValue' call is nearly instant however. Here is the code I'm using : [TestClass] public class PerfMon { [TestMethod] public void SimpleCreationTest() { Stopwatch Time = new Stopwatch(); Time.Start(); Debug.WriteLine("Time is : " + Time.ElapsedMilliseconds); // Create

问题 I am adding some performance counters to my c# project and am creating a new PerformanceCounterCategory. In this category, I would like to have multiple counters/timers that track different things. I have a need to use multiple average timers and am trying to understand how the AverageBase counter gets associated with the correct AverageTimer32 counter when there are more than one in the CoutnerCreationDataCollection. A couple of questions: 1. First, is this a correct way to do it? The

问题 I would like to count the number of Instructions per Cycle executed on an ARM cortex-M4 (or cortex-M3) processor. What it's needed is: number of instructions (executed at runtime) of the code I want to profile and number of cycles that the code takes to execute. 1 - Number of Cycles Use the cycle counter is quite easy and straightforward. volatile unsigned int *DWT_CYCCNT ; volatile unsigned int *DWT_CONTROL ; volatile unsigned int *SCB_DEMCR ; void reset_timer(){ DWT_CYCCNT = (int *

问题 I would like to count the number of Instructions per Cycle executed on an ARM cortex-M4 (or cortex-M3) processor. What it's needed is: number of instructions (executed at runtime) of the code I want to profile and number of cycles that the code takes to execute. 1 - Number of Cycles Use the cycle counter is quite easy and straightforward. volatile unsigned int *DWT_CYCCNT ; volatile unsigned int *DWT_CONTROL ; volatile unsigned int *SCB_DEMCR ; void reset_timer(){ DWT_CYCCNT = (int *

问题 I'm Completely Baffled(TM) by this one: On a Win7SP1, 64-bit machine, PerfMon appears to be completely disavowing the knowledge of installed, custom performance counters. I'm working with an existing code base that is installing counters perfectly fine on production machines, but when I run it on my machine, when I run it with the counters I'd added, or if I run a completely contrived assembly (the meat of which is pasted below), I get seriously weird behavior. It's probably easiest to

问题 I'm trying to register a performance counter and part of this process includes adding some textual descriptions to a specific registry key. For English this key is HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Perflib\009 which apparently is also known as HKEY_PERFORMANCE_TEXT. There are a pair of values under there (Counter, Help) that have REG_MULTI_SZ data, and I need to modify them to accomplish my goal. The official way of doing this is by using a tool called lodctr

问题 I want to measure performance of my business class in a web service. How can I do it through coding? I want to know how much CPU my business class consumes to perform its operation and how does performance vary if web service gets multiple simultaneous service calls. I do not want to measure performance of my web service; I just want to know how my business class is performing. My thought: After reading some blogs, I decide to write some piece of code that will create a PerformanceCounter as