Consider the following code that accesses three values in memory, scalar integers x and s, and an integer vector y[i]. What is the memory latency, in clock cycles, for a trip round the loop (after the first iteration)? Assume that the array is not cached and each new access to the array results in a miss.
The system has both L1 and L2 caches. The access time of the L1 cache is 2 cycles, the access time of the L2
cache is 6 cycles and main memory has an access time of 50 cycles. In this case all memory and cache memory
accesses take place in parallel.
for (i=0; i< 100; i++)
{
x = y[i];
s = s + x;
}
The first array load results in a miss and memory is accessed (40 cycles).
The second access to x results in a hit to L1 (2 cycles).
The third access to s results in a hit to L1 (2 cycles).
The total access time is 40 + 2 + 2 = 44 cycles.
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