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The transistor count on an IC will double every 18 to 24 months.
The performance enhancement is limited to the amount that the improvement is used.
A broad scope term used in describing the overall ability for a computer to exicute a program.
Or, Performance = 1 / Execution time
The frequency that the processor runs at
Cycles per instruction
CPI = CPU Clock cycles / Instruction count
The process of positioning a read/write head over the pproper track on a disk.
Concentric circles that makes up the surface of a magnetic disk
Segments that make up a track on a magnetic disk.
Something you put shrimp salads on.
The time it takes for the read/write head to locate the proper sector within a track.
The processor continually checks the I/O device to determine if the I/O device has a request for the CPU.
An Interrupt driven I/O sends an interrupt flag to the CPU to tell the CPU that it has a request of services from the CPU. This eliminates the need for the CPU to continually poll the devices.
Direct Memory Access. (DMA)
DMA is a process where a DMA controller provides the ability to transfer data to and from the memory without putting a load on the processor.
RAID 0 is used simply for speed but has no redundancy.
RAID 1 uses mirroring to make a duplicate of the hard drive on another. Used for redundancy.
RAID 2: uses error detection and correction.
RAID 3: Uses a parity check on an additional drive to rebuild any failures.
RAID 4: Uses block parity similar to RAID 3.
RAID 5 (JBOD) A combination of RAID 0 and RAID 3. It has the speed of RAID 0 bit with parity redundancy of RAID 3. Hard disks can be of any size as parity blocks can be located on any disk.
RAID 6: Multiple check blocks are in place for failure detection.
The minimum unit of information that either can or can’t be present in a cache.
Requested data located in some block in the upper level.
located in some block in the upper level.
A term for the natural unit of data used by a particular processor design. Usually a fixed bit size. 32-bit for mips.
Part of a memory address in a block.
A field in a table that used to identify whether
the associated block in the hierarchy corresponds to a requested word.
A scheme designed for consistency where data is always written to both the main memory and the cache.
A write-back handles writes by updating values only to the block in the cache, then writing the modified block to the lower level of the hierarchy when the block is replaced.
A virtual memory block.
The table containing the virtual to physical address translations in a virtual memory system.
A cache that keeps track of reciently used address mappings to try to avoid an access to the page table.
A miss on the block is a page fault.
A virtual address is a location in virtual memory which is translated by hardware and software into a physical address.
The physical address can be used to access the memory.
CSIS 2810 Midterm terms