A. Cache coherency and false sharing The simplest cache coherency protocol is MESI. Although cache coherency is important for making sure a program executes correctly, it leads to false sharing, which can cause performance problems. In order to remove false sharing, we have to either move variables in memory so that they fit in different cache lines or Align shared global data to cache line boundaries. For example, in the situation shown in this code: struct foo { int xi int Vi } ; int numThreads = 2; struct foo z; if (threadID ==0) { int suml = 0; int ii for (i = 0; i < 100000; ++i) sum1 += z. x; } www if (threadID ==1) { int sum2 0; int ii for (j = 0; j < 100000; ++j) sum2 += z.y;}

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Linux

An operating system (OS) is the software which manages hardware and resources, like CPU, storage and memory. The OS bridges the applications and hardware and makes the connections between all of your software and the hardware resources.