Anybody?
On Tue, Nov 20, 2018 at 12:28 AM Amine Marref <[email protected]> wrote: > Hello, > > I am trying to understand some of the timing behaviour of a multi-threaded > application. I am running gem5 in FS mode and I can obtain two useful files > "stats.txt" and "system.tasks.txt". Throughout the lines of the two files, > I could find three ways of referring to a cpu/core: (i) "cpu" suffixed with > a natural number (cpuN), (ii) "cpus" suffixed with a natural number > (cpusN), and (iii) "cpu_id" equals some natural number (cpu_id=N). > > The following are (non-contiguous) lines from the "stats.txt" output file. > system.cpu0.dtb.hits > 6 # DTB hits > system.cpu1.pwrStateResidencyTicks::OFF > 203472000 # Cumulative time (in ticks) in various > power states > system.cpu2.itb.inst_hits > 0 # ITB inst hits > system.cpu3.itb.flush_tlb > 2 # Number of times complete TLB was flushed > system.switch_cpus0.fetch.rateDist::samples 312140 > # Number of instructions fetched each cycle (Total) > system.switch_cpus1.rob.rob_reads > 0 # The number of ROB reads > system.switch_cpus2.iew.iewIdleCycles > 0 # Number of cycles IEW is idle > system.switch_cpus3.itb.write_accesses > 0 # DTB write accesses > > The following are lines from the "systems.tasks.txt" output file. > tick=3203692196500 5 cpu_id=0 next_pid=1107 next_tgid=1107 > next_task=runscript > tick=3203956858500 6 cpu_id=0 next_pid=1 next_tgid=1 next_task=init > tick=3204033514000 3 cpu_id=0 next_pid=-1 next_tgid=-1 next_task=kernel > > My understanding is that "cpuN" in the "stats.txt" file refers to [0..N] > processor cpus/cores specified by the flag "-n N" that is passed to the > simulation script "fs.py". My guess is that "cpusN" refers to the same > entity but what is the "s" doing there? To mean "switch"? Finally, from my > reading around, it looks like "cpu_id=N" is not related to the cpus/cores > used to simulate a program but rather to the cpu model used in simulation > e.g. "--cpu-type=O3_ARM_v7a_3" has "cpu_id=0". > > My question finally is: "is my understanding of the meaning of the three > cpu entities above correct"? > > Thanks, > Amine. > > -- > marref.org >
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