multicore

问题 I did some tests a year ago concerning multicore with java 7. First I implemented some calculations only in the main thread (CPU usage showed that only one core did all the work) and then I implemented Callable with an ExecutorService instance. While running it all cores where doing the work. Now, one year, later I have to implement a little programm (using java 8) which interpolates a lot of data. All the work is implemented in the main thread (without Callable and ExecutorService) but when

问题 This question has already been answered for x86 however, I couldn't find much about ARM MP cpus like Cortex-A9, Cortex-A15 etc... More importantly i want to know if interrupts can be raised on non-primary cpu without any configuration etc. I am working on a software which deals only with the primary cpu hence i put the rest in WFI state however I am unaware of how interrupts work on the MP arm cpus, Is it possible that the main cpu continues executing code and one of the secondary cpu picks

问题 When I was learning Java coming from a background of some 20 years of procedural programming with basic, Pascal, COBOL and C, I thought at the time that the hardest thing about it was wrapping my head around the OOP jargon and concepts. Now with about 8 years of solid Java under my belt, I have come to the conclusion that the single hardest thing about programming in Java and similar languages like C# is the multithreaded/concurrent aspects. Coding reliable and scalable multi-threaded

问题 I'm working on a program that processes many requests, none of them reaching more than 50% of CPU ( currently I'm working on a dual core ). So I created a thread for each request, the whole process is faster. Processing 9 requests, a single thread lasts 02min08s, while with 3 threads working simultaneously the time decreased to 01min37s, but it keeps not using 100% CPU, only around 50%. How could I allow my program to use full processors capability? EDIT The application isn't IO or Memory

问题 I really like these tools when it comes to the concurrency level it can handle. Erlang looks like much more stable solution but requires much more learning and a lot of diving into functional language paradigm. And it looks like Erlang makes it much better when it comes to multi cores CPUs(fix me if I'm wrong). But which should I choose? Which one is better in the short/long term perspective? My goal is to learn a tool which makes scaling my web projects under high load easier than

问题 I want to start to write applications(C++) that will utilize the additional cores to execute portions of the code that have a need to perform lots of calculations and whose computations are independent of each other. I have the following processor : x64 Family 15 Model 104 Stepping 2 Authentic AMD ~1900 Mhz running on Windows Vista Home premium 32 bit and Opensuse 11.0 64 bit. On the Intel platforms , I've used the following APIs Intel TBB, OpenMP. Do they work on AMD and does AMD have

问题 I want to start to write applications(C++) that will utilize the additional cores to execute portions of the code that have a need to perform lots of calculations and whose computations are independent of each other. I have the following processor : x64 Family 15 Model 104 Stepping 2 Authentic AMD ~1900 Mhz running on Windows Vista Home premium 32 bit and Opensuse 11.0 64 bit. On the Intel platforms , I've used the following APIs Intel TBB, OpenMP. Do they work on AMD and does AMD have

问题 In R 3.0.2 on Linux 3.12.0, I am using the system() function to execute a number of tasks. The desired effect is for each of these tasks to run as they would if I had executed them on the command-line via Rscript outside of R system() . However, when executing them inside R via system() , each task is tied to the same single CPU from the master R process. In other words: When launched via RScript directly from a bash shell, outside of R, each task runs on its own core as possible (this is

问题 Hopefully this is a better question than my previous. I have a .exe which I will be passing different parameters (file paths) to which it will then take in and parse. So I will have a loop going, looping through the file paths in a list and passing them to this .exe file. For this to be more efficient, I want to spread the execution across multiple cores which I think you do through threading. My question is, should I use the threadpool, or multiple threads to run this .exe asynchronously?

问题 Follow up question from Multi-core usage, threads, thread-pools. Are threads moved from one core to another during their lifetime? Of course. Imagine you have three threads running on a dualcore system. Show me a fair schedule that doesn't involve regularly moving threads between cores. This is my first time on this site, so I didn't have enough rep to comment I guess. I decided to just make a new question referencing the one I wanted to comment on. What is the process of selecting a core to