If you wanted to make the system sequentially consistent, what are the key constrains you need to impose

The call of instructions and data must be sequential, there can be no reordering of instructions but to allow reordering, a fence must be created.

Explanation:

Sequential consistent memory model is able to use instructions when or before processing is done and after processing, so long as the instruction order is sequential.

This is similar to uploading a video on you-tube, the site immediately creates a page for the video even before the video is fully uploaded. Sent tweeter messages are seen by different people at different times, but the messages appear to be arranged sequentially.

answer: internal fragmentation is the difference between the (fixed) size of a memory hole and the data within in that memory. for example, if a 1,024 byte block of memory holds 800 bytes of data, then the 224 bytes difference is considered lost to internal fragmentation.

external fragmentation occurs when the sum of memory fragments is large enough to satisfy a request, but the holes are non-contiguous and the request cannot be satisfied. this can occur when memory is dynamically allocated and freed.

explanation: