Search the Community

Hello all, I'm simulating MOESI protocol for L1 caches in SystemC. I'm getting different results for the same source code when running in SystemC 2.3.0 and SystemC 2.3.1 versions in different machines. Could anyone kindly pass some light on this topic? Machine1: Linux 3.13, Ubuntu 14.04, SystemC 2.3.1, Intel Pentium Dual Core processor. Output - Machine 1: CPU Reads RHit RMiss Writes WHit WMiss Hitrate 0 6 0 6 4 0 4 0.000000 1 34 0 34 22 0 22 0.000000 2 35 0 35 43 0 43 0.000000 3 39 2 37 46 2 44 4.705882 4 36 0 36 55 0 55 0.000000 5 52 0 52 47 0 47 0.000000 6 48 3 45 51 2 49 5.050505 7 42 1 41 55 5 50 6.185567 Total: 292 6 286 323 9 314 15 Avg: 36 0 35 40 1 39 1 2. Main memory access rates Bus had 286 reads and 1 upgrades and 314 readX. A total of 601 accesses. 3. Average time for bus acquisition There were 50 waits for the bus. Average waiting time per access: 0.083195 cycles. 4. There were 1 Cache to Cache transfers 5. Total execution time is 10204 ns, Avg per-mem-access time is 16.978369 ns 6. Probe Read: 5, Probe ReadX: 7 Machine 2: Linux 3.13, Ubuntu 14.04, SystemC 2.3.0, Intel i7 Quad Core processor. Output - Machine 2: CPU Reads RHit RMiss Writes WHit WMiss Hitrate 0 6 0 6 4 0 4 0.000000 1 34 0 34 22 0 22 0.000000 2 35 0 35 43 0 43 0.000000 3 39 2 37 46 2 44 4.705882 4 36 0 36 55 0 55 0.000000 5 52 0 52 47 0 47 0.000000 6 48 3 45 51 2 49 5.050505 7 42 1 41 55 5 50 6.185567 2. Main memory access rates Bus had 286 reads and 0 upgrades and 314 readX. A total of 600 accesses. 3. Average time for bus acquisition There were 51 waits for the bus. Average waiting time per access: 0.085000 cycles. 4. There were 0 Cache to Cache transfers 5. Total execu tion time is 10204 ns, Avg per-mem-access time is 17.006667 ns 6. Probe Read: 1 , Probe ReadX: 0 Does the version 2.3.0 and 2.3.1 are the reason for the inconsistent result? Source code and steps to run the simulation can be found here. Thanks, Tamilselvan Shanmugam.