Hi all， My server's specifications are as follows: Intel E5310 @1.6GHz, 8 cores, each core has 32K L1 data cache, 32K L1 instruction cache and 4096K L2 cache. Running two conparison program(double version and float version) on my server with the same input, running time of double version is 2m25s, and float version is 2m7s. float version < double version ( Due to the deviation of float version's result within the acceptable range, so we don't consider its impact ) But when I put two conparison program to run on gem5, I got the opposite result. We used SE mode to simulate Atom Embedded environment, with the command line of " ./build/X86/gem5.fast configs/example/se.py -c /home/zzh/code/double_scale -o 16 -n 2 --mem-size=2048MB --caches --l2cache --l2_size 256kB --cpu-clock 1.46GHz --sys-clock 1.46GHz --cpu-type=AtomicSimpleCPU "
Finally I got two stats.txt as follows: Double version’s stats.txt: sim_seconds 337.821068 # Number of seconds simulated sim_ticks sim_ticks 337821067887820 #Number of ticks simulated host_inst_rate 2164548 # Simulator instruction rate (inst/s) host_op_rate 3369417 # Simulator op (including micro ops) rate (op/s) host_tick_rate 2820528361 # Simulator tick rate (ticks/s) host_mem_usage 2323216 # Number of bytes of host memory used host_seconds 119772.26 # Real time elapsed on the host sim_insts 259252813524 #Number of instructions simulated system.mem_ctrls_0.totalEnergy 129723290069280 #Total energy per rank( pJ ) system.mem_ctrls_0.averagePower 384 #Core power per rank Float version’s stats.txt: sim_seconds 349.758410 # Number of seconds simulated sim_ticks sim_ticks 349758409947185 #Number of ticks simulated host_inst_rate 2423477 # Simulator instruction rate (inst/s) host_op_rate 3935604 # Simulator op (including micro ops) rate (op/s) host_tick_rate 3269516689 # Simulator tick rate (ticks/s) host_mem_usage 2324240 # Number of bytes of host memory used host_seconds 106975.57 # Real time elapsed on the host sim_insts 259252795117 #Number of instructions simulated system.mem_ctrls_0.totalEnergy 134307229419840 #Total energy per rank( pJ ) system.mem_ctrls_0.averagePower 384 #Core power per rank From the above data, why run time (sim_seconds) show the opposite result with the server? double version of the time is less than the float version. And in terms of the total energy per rank, double version is also smaller than the float version. Though the number of instructions simulated( sim_insts ) of double version is greater than float version.
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