processor

This thread is ok. How to get Processor and Motherboard Id? I wanted to get processor ID using C++ code not using WMI or any third party lib. OR anything on a computer that turns out to be unique. One thing is Ethernet ID but which is again removable on some machines. This I want to use mostly for licensing purpose. Is processor ID unique and available on all major processors? I had a similar problem lately and I did the following. First I gained some unique system identification values: GetVolumeInformation for HDD serial number GetComputerName (this of course is not unique, but our system

When should one use polling method and when should one use interrupt based method ? Are there scenarios in which both can be used ? If the event of interest is: Asynchronous Urgent Infrequent then an interrupt based handler would make sense. If the event of interest is: Synchronous (i.e. you know when to expect it within a small window) Not Urgent (i.e. a slow polling interval has no ill effects) Frequent (i.e. majority of your polling cycles create a 'hit') then polling might be a better fit. Other considerations include whether you are writing a device driver for an OS or just writing bare

I have been trying to log all memory accesses of a program, which as I read seems to be impossible. I have been trying to see to what extent can I go to log atleast a major portion of the memory accesses, if not all. So I was looking to program the PEBS counters in such a way that I could see changes in the number of memory access samples collected. I wanted to know if I can do this by modifying the counter-reset value of PEBS counters. (Usually this goes to zero, but I want to set it to a higher value) So I was looking to program these pebs counters on my own. Has anybody had experience

Whenever a cache miss occurs, is it possible to know the address of that missed cache line? Are there any hardware performance counters in modern processors that can provide such information? Yes, on modern Intel hardware there are precise memory sampling events that track not only the address of the instruction, but the data address as well. These events also includes a great deal of other information, such as what level of the cache hierarchy the memory access was satisfied it, the total latency and so on. You can use perf mem to sample this information and produces a report. For example,

Many implementation of the library goes deep down to FPATAN instuction for all arc-functions. How is FPATAN implemented? Assuming that we have 1 bit sign, M bits mantissa and N bits exponent, what is the algorithm to get the arctangent of this number? There should be such algorithm, since the FPU does it. Trigonometric functions do have pretty ugly implementations that are hacky and do lots of bit fiddling. I think it will be pretty hard to find someone here that is able to explain an algorithm that is actually used. Here is an atan2 implementation: https://sourceware.org/git/?p=glibc.git;a

What is the difference between a single precision floating point operation and double precision floating operation? I'm especially interested in practical terms in relation to video game consoles. For example, does the Nintendo 64 have a 64 bit processor and if it does then would that mean it was capable of double precision floating point operations? Can the PS3 and Xbox 360 pull off double precision floating point operations or only single precision and in general use is the double precision capabilities made use of (if they exist?). VonC Note: the Nintendo 64 does have a 64-bit processor,