MCQ IN COMPUTER SCIENCE & ENGINEERING

Detailed explanation-1: -When it comes to speed, the L2 cache lags behind the L1 cache but is still much faster than your system RAM. The L1 memory cache is typically 100 times faster than your RAM, while the L2 cache is around 25 times faster.

Detailed explanation-2: -Memory Systems The first-level (L1) cache is small enough to provide a one-or two-cycle access time. The second-level (L2) cache is also built from SRAM but is larger, and therefore slower, than the L1 cache. The processor first looks for the data in the L1 cache.

Detailed explanation-3: -Level-1 cache runs at and is synced with the CPU clock, which is the fastest in the system. Level-2 cache on the other hand has to serve many CPUs, and is running in a different (slower) clock domain. Not only the L2 clock slower (larger tile) but to cross a clock domain boundary adds another delay.

Detailed explanation-4: -L1 or L2 can be significantly faster than L3, though L3 is usually double the speed of DRAM. With multicore processors, each core can have dedicated L1 and L2 cache, but they can share an L3 cache. If an L3 cache references an instruction, it is usually elevated to a higher level of cache.

Detailed explanation-5: -The L1 cache is slower than the L3 cache. With write back updates are made only in the cache. It has become possible to have a cache on the same chip as the processor. All of the Pentium processors include two on-chip L1 caches, one for data and one for instructions.