cpu

问题 I have an assignment in which i have to write a program in C on Linux(i use CentOS), which uses threads/processes to determine the number of cores from the CPU. Firstly I tried to print the current time in mili/microseconds, because I know that there can run 1thread/core(or 2 with HT). But by miliseconds more than 10 threads printed the same amount of time and by microseconds none were identical. Secondly I tried to measure the execution time of threads with clock, given I have 4 cores, the

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . I generally know that the more the number of processors the more processes (watching a movie, playing some game, running firefox with youtube playing a Simpson's episode, all simultaneously) you can have simultaneously going without your computer slowing down. But I want to know how to make sense of the linux

问题 Since current x86_64 implementations are only capable of a forty eight bit "virtual" address space to reduce MMU complexity, could the top sixteen bits be used to implement security tag data. Do the current implementations restrict this (even know the IP and other segment registers are a full sixty four bits) usage and restrict the top sixteen bits of pointers to only contain virtual addresses and not other data? 回答1: No, you cannot. The top 16 bits are currently required to all be the same

问题 I know it could be marked as duplicate. But none of the threads helped me, so I decided to make my own. I'm a Java back-end developer and I've decided to learn some Android stuff. I worked on Android Studio several years ago having i5-4570 processor. Then I gave up. Now I see Android Studio is really really interesting, so I have downloaded it. Now I have Ryzen 5 1600 processor. It's really great... but... None of the Android emulators work for me. What have I tried? Android Studio built-in

问题 I'm trying to install the OS X command line tools, and I've tried the beta, and the most recent and nothing is working. Every time I try to use one of the tools something like this happens, my example is make and gnumake as those are what I need right now -bash: /usr/bin/gnumake: Bad CPU type in executable -bash: /usr/bin/make: Bad CPU type in executable note, I am running Yosemite 10.10.4, and my processor is a 2.8 GHz Intel Core i5. If you need any more info be sure to let me know 回答1: Your

问题 I was wondering what is the best way to implement a renderer in JavaScript. It's not the content part of the rendering that's really important here - I would rather like to hear when and how to effectively run the renderer code. Currently, I have window.setInterval(renderFunc, 1000 / 20) , which will just render a frame each 50 ms (i.e., fps = 20). The point is that faster computers won't render more frames, moreover slower computers will not be able to catch up with 20 fps, so the function

问题 I'm currently trying to get information about the CPU load and RAM usage out of an PowerPC with QNX running on it. The idea is to write that information in a text file with a time stamp over a certain amount of time, but this ain't my problem here once I have the information as a "standard value". My programm will be in C++ and I already did this kind of program for Windows (via PDH API). Maybe you have page like this but for QNX? Probably I'm looking for the wrong keywords. Can you help me

问题 We have a solr cloud setup of 4 shards (one shard per physical machine) having ~100 million documents. Zookeeper is on one of those 4 machines. We encounter complex queries having wild cards and proximity searches together and it sometimes takes more than 15 secs to get top 100 documents. Query traffic is very very low at the moment (2-3 queries every minute). 4 Servers hosting cloud have following specs: (2 servers -> 64 GB RAM, 24 CPU cores, 2.4 GHz) + (2 servers -> 48 GB RAM, 24 CPU cores,

问题 Are machine word size (or smaller) writes serialized? Only one native opcode is needed to copy register content to RAM. 回答1: Writing data to RAM is atomic. If two CPUs try to write to the same location at the same time, the memory controller will decide on some order for the writes. While one CPU is writing to memory, the other CPU will stall for as many cycles as necessary until the first write is completed; then it will overwrite its value. This is what's known as a race condition. Writes

问题 typedef union status { int nri; char cit[2]; }Status; int main() { Status s; s.nri = 1; printf("%d \n",s.nri); printf("%d,%d,\n",s.cit[0],s.cit[1]); } OUTPUT: 1 0,1 I know this output on the second line is depend on the endianess of the CPU. How I can write such in a platform-independant program? Is there any way of checking the endianess of the CPU? 回答1: You can use htonl() and/or ntohl(). htonl() stands for "host to network long", while ntohl() stands for "network to host long". The "host"