Does Java have support for multicore processors/parallel processing? Yes. It also has been a platform for other programming languages where the implementation added a “true multithreading” or “real threading” selling point. The G1 Garbage Collector introduced in newer releases also makes use of multi-core hardware. Java Concurrency in Practice Try to get a copy of … Read more
In the 2009-2012 period, the following things have happened: 2012: From 2012, the parallel Haskell status updates began appearing in the Parallel Haskell Digest. 2011: Parallel and Concurrent Programming in Haskell, a tutorial. version 1.1 released by Simon Marlow Haskell and parallelism, mentioned in an article in the Economist magazine, Jun 2nd 2011. Parallel tree … Read more
You can do this with make – with gnu make it is the -j flag (this will also help on a uniprocessor machine). For example if you want 4 parallel jobs from make: make -j 4 You can also run gcc in a pipe with gcc -pipe This will pipeline the compile stages, which will … Read more
You don’t need a synchronized variable, but rather an atomic variable. Luckily, you can just use std::atomic<bool>. The key issue is that if more than one thread accesses the same memory simultaneously, then unless the access is atomic, your entire program ceases to be in a well-defined state. Perhaps you’re lucky with a bool, which … Read more
X86_FEATURE_CONSTANT_TSC + X86_FEATURE_NONSTOP_TSC bits in cpuid (edx=x80000007, bit #8; check unsynchronized_tsc function of linux kernel for more checks) Intel’s Designer’s vol3b, section 16.11.1 Invariant TSC it says the following “16.11.1 Invariant TSC The time stamp counter in newer processors may support an enhancement, referred to as invariant TSC. Processor’s support for invariant TSC is indicated … Read more
Straight from Intel, here’s an explanation of how recent processors maintain a TSC that ticks at a constant rate, is synchronous between cores and packages on a multi-socket motherboard, and may even continue ticking when the processor goes into a deep sleep C-state, in particular see the explanation by Vipin Kumar E K (Intel): http://software.intel.com/en-us/articles/best-timing-function-for-measuring-ipp-api-timing/ … Read more
Two new keywords added to the C# 5.0 language are async and await, both of which work hand in hand to run a C# method asynchronously without blocking the calling thread. That gets across the purpose of the feature, but it gives too much “credit” to the async/await feature. Let me be very, very clear … Read more
You can try using a “catchpoint” (catch throw) to stop the debugger at the point where the exception is generated. The following excerpt From the gdb manual describes the catchpoint feature. 5.1.3 Setting catchpoints You can use catchpoints to cause the debugger to stop for certain kinds of program events, such as C++ exceptions or … Read more
There is no such thing as “multiprocessor” or “multicore” programming. The distinction between “multiprocessor” and “multicore” computers is probably not relevant to you as an application programmer; it has to do with subtleties of how the cores share access to memory. In order to take advantage of a multicore (or multiprocessor) computer, you need a … Read more