hardware

问题 Is there a way to determine, for some progamatically defined interval, if a SMM entry has occurred on the current core? 回答1: Starting with Nehalem, the MSR register 0x34 (called MSR_SMI_COUNT ) counts the number of SMIs that occurred since the system was booted. It's read-only and Intel-specific. You can programmability read from this register (or any other MSR register) from user mode using the /dev/cpu/CPUNUM/msr interface. There are several tools that use the interface to show the SMI

问题 How can i send and receive data though parallel port using C# .net? Also can u guys please explain how to use parallel port to receive data? 回答1: I/O Ports Uncensored - 1 - Controlling LEDs (Light Emiting Diodes) with Parallel Port 来源： https://stackoverflow.com/questions/1032190/parallel-port-access-in-c-sharp-net

问题 I want to measure the speed of the cache (I asked a question about that), so I write this code: #include<cstdio> #include<ctime> #include<windows.h> const int mod = 100000007; volatile int f[100000007]; volatile int *p; int main() { FILE *f1; f1=fopen("CacheTest.txt","w"); for(int l=1;l<=100000;) { clock_t st,ed; st=clock(); int now=0; for(int i=0;i<mod;i++) { now+=l;//note:mod is a prime and that will traversal the array if (now>=mod) now-=mod; } ed=clock(); double extime=(double)(ed-st)

问题 I'm trying to generate an array of latches that are placed adjacent to each other using a Generate statement. I've been trying to use the Xilinx constraint "RLOC" to do this, but I haven't been successful. The code below won't successfully implement, but should illustrate what I'm trying to obtain. The issue with the code below is that "i" in the constraint call isn't being converted into a string, which is what the call is looking for. Does anyone have experience doing this? I'm using a

问题 Seeking most efficient method for retrieving the GPU model in Objective-C or Carbon. I want to avoid using system_profiler because it is slow, but if it comes down to that I am willing to use it, but I wanna exhaust other options first. 回答1: You could try glGetString(GL_RENDERER) from the OpenGL library. 来源： https://stackoverflow.com/questions/3171529/gpu-chipset-detection

问题 Many USB devices contain a unique serial number (which is actually a Unicode string) which the host can use in conjunction with the 16-bit vendor and product ID numbers to uniquely identify the device. I'm trying to figure out how to write a Windows application that would be able to display a list of all USB human interface devices attached to the system. The list would have one row for each HID, including system keyboards. There would be columns in the list for the vendor ID, product ID, and

问题 I was wondering what the real-world performance effects are of hyperthreading (multiple logical cores for each physical core) in different situations. Intel advertises this as being effective for when threads of execution are waiting for I/O, however in memory intensive applications, it can be ineffective because when a switch occurs between logical cores, locality is lost in the processor cache. The second application's data is loaded into cache, forcing the first application's memory out of

问题 Is there any way to change UDID of my iPhone/iPad? or please suggest the way to generate fake UDID of the iPhone/iPad Device. Thanks in advance. 回答1: Yes, download "UDID faker" from Cydia for a fully-featured solution (requires jailbreaking), or just use method swizzling on - [UIDevice uniqueIdentifier] if replacing it locally (within your app) is sufficient. 回答2: Your UDID is in the hardware, it's a hash composed of various serial numbers and other values. You can't physically change your

问题 Is there a way to use HTML 5 to access local system hardware details? I'm looking specifically for attributes about CPU, RAM, Disk space, Video card information, Browsers available and plug-ins (with verson information). Ultimately, I am trying to determine if I can build a tool to check a machine for hardware requirements to run software but do so without needing to actually install anything on the machine. Any help is much appreciated! Thanks! 回答1: I don't know if HTML5 can help you but

问题 How can I get the following hardware attributes using Matlab? Motherboard manufacturing serial number Processor Id Processor manufacturing serial number Hard disk Id Hard disk manufacturing serial number And is there any function or class responsible for detecting attributes of other machine hardware components attributes? I know it can be done using system or console commands, but I don't know how. However, I prefer to know both two ways, the one using Windows console commands, and the one