performancecounter

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 PerformanceCounter RAM = new PerformanceCounter("Memory", "Available MBytes"); Debug.WriteLine("Time is : " +

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 counter stats for './test': 200,114 dTLB-store-misses 0.213379649 seconds time elapsed P.S. I have

I want to use Precise Event-Based Sampling (PEBS) to record all the addresses of specific events (say cache misses for example), on a XeonE5 Sandy Bridge. However, the Performance Analysis Guide for Core TM i7 Processor and Intel® XeonTM 5500 processors , p.24, contains the following warning: As the PEBS mechanism captures the values of the register at completion of the instruction, the dereferenced address for the following type of load instruction (Intel asm convention) cannot be reconstructed. MOV RAX, [RAX+const] This kind of instruction is mostly associated with pointer chasing mystruc =

Inside the static Stopwatch constructor we can see the following code, that basicly checks whether a high-resolution performance counter exists. static Stopwatch() { if (!SafeNativeMethods.QueryPerformanceFrequency(out Frequency)) { IsHighResolution = false; Frequency = 0x989680L; tickFrequency = 1.0; } else { IsHighResolution = true; tickFrequency = 10000000.0; tickFrequency /= (double) Frequency; } } On MSDN it says about QueryPerformanceFrequency : Retrieves the frequency of the high-resolution performance counter, if one exists It's pretty unclear, however, when exactly does it exist? I

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 using perf , which add :p to the cycles event. And I can successfully run perf record -e cycles:p on my

I am connecting to various performance counters in the Process category. I am using the following c# method to determine the instance name to use when acquiring the counters: private const string _categoryName = "Process"; private const string _processIdCounter = "ID Process"; public static bool TryGetInstanceName(Process process, out string instanceName) { PerformanceCounterCategory processCategory = new PerformanceCounterCategory(_categoryName); string[] instanceNames = processCategory.GetInstanceNames(); foreach (string name in instanceNames) { using (PerformanceCounter processIdCounter =