Processes are typically preemptively multitasked, and process switching is relatively expensive, beyond basic cost of context switching, due to issues such as cache flushing.
22.
Switching blocks is accomplished by a single instruction ( LPSD ), providing fast context switching, since registers do not have to be saved and restored.
23.
Physical memory is statically mapped and the CNK neither needs nor provides scheduling or context switching, given that at each point it runs one application for one user.
24.
The rationale for these devices is the same as for the original channel controllers, namely off-loading transfer, interrupts, and context switching from the main CPU.
25.
However, just as with an ordinary monolithic kernel, there is none of the performance overhead for message passing and context switching between kernel and user mode that normally comes with a microkernel.
26.
This allowed for very fast context switching by simply changing the workspace pointer to the memory used by another process ( a technique used in a number of contemporary designs, such as the TMS9900 ).
27.
Virtual memory compression is also distinct from context switching systems, such as Connectix s RAM Doubler and Apple OS 7.1, in which inactive processes are suspended and then compressed as a whole.
28.
The Convoy problem seems to be easing with modern JVMS, but it can be hidden by slow context switching : in this case, latency will increase, but throughput will continue to be acceptable.
29.
The MAC-16 was designed to support various high-performance military and civilian roles, and thus spent a considerable amount of time on guaranteeing high speed context switching to support real-time computing.
30.
From the point of view of a multi-threading environment, different threads of one process share code space along with data space, which reduces the overhead of context switching considerably as compared to process switching.
