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The relevant term is of the porting target is computer architecture; it comprises the instruction set(s) and the microarchitecture(s) of the processor(s), at least of the CPU. The target also comprises the "system design" of the entire system, be it a supercomputer, a desktop computer or some SoC, e.g. in case some unique bus is being
Notably, a version of Fiasco (Fiasco-UX) can run as a user-level application on Linux. L4/Fiasco implements several extensions to the L4v2 API. Exception IPC enables the kernel to send CPU exceptions to user-level handler applications. With the help of alien threads, it is possible to perform fine-grained control over system calls. X.2-style ...
The method of invoking the kernel function varies from kernel to kernel. If memory isolation is in use, it is impossible for a user process to call the kernel directly, because that would be a violation of the processor's access control rules. A few possibilities are: Using a software-simulated interrupt. This method is available on most ...
Support for heterogeneous memory management (HMM), suited only for graphics hardware featuring version 2 of the AMD's IOMMU, was accepted into the Linux kernel mainline version 4.14. [ 12 ] Integrated support for HSA platforms has been announced for the "Sumatra" release of OpenJDK , due in 2015.
Linux distributions that have highly modified kernels — for example, real-time computing kernels — should be listed separately. There are also a wide variety of minor BSD operating systems, many of which can be found at comparison of BSD operating systems .
In early 1960s computers, main memory was expensive and very limited, even on mainframes. Minimizing the size of a program to make sure it would fit in the limited memory was often central. Thus the size of the instructions needed to perform a particular task, the code density, was an important characteristic of any instruction set. It remained ...
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Open source, multithreading, multi-core, 4 threads per core, scalar, in-order, integrated memory controller, 1 FPU UltraSPARC T2: 2007 8 Open source, multithreading, multi-core, 8 threads per core SPARC T3: 2010 8 Multithreading, multi-core, 8 threads per core, SMP, 16 cores per chip, 2 MB L3 cache, in-order, hardware random number generator