Hi Jason: In my config.ini: [system.clk_domain] type=SrcClockDomain clock=1000 domain_id=-1 eventq_index=0 init_perf_level=0 voltage_domain=system.voltage_domain
[system.cpu_clk_domain] type=SrcClockDomain clock=500 domain_id=-1 eventq_index=0 init_perf_level=0 voltage_domain=system.cpu_voltage_domain 发件人: Jason Lowe-Power [mailto:ja...@lowepower.com] 发送时间: 2021年4月27日 22:34 收件人: gem5 users mailing list <gem5-users@gem5.org> 抄送: Bobby Bruce <bbr...@ucdavis.edu>; Liyichao <liyic...@huawei.com> 主题: Re: [gem5-users] 答复: TimingCPU's IPC Hello, Check out the config.ini file in m5out/ and see what your CPU clock is actually set to. I would guess that the options are not behaving the way you expect (well, the way anyone would expect). se.py (and the options in Options.py) is pretty fundamentally broken. There are tons of special cases and other things that will overwrite options that you pass. There's no guarantee when you say "--cpu-clock=2GHz" on the command line that the CPU's clock is actually set to 2GHz. I strongly suggest using your own configuration files like in Learning gem5. Cheers, Jason On Tue, Apr 27, 2021 at 5:58 AM Liyichao via gem5-users <gem5-users@gem5.org<mailto:gem5-users@gem5.org>> wrote: My cmd is ./build/ARM/gem5.opt --debug-flags=Exec configs/example/se.py --cpu-type=TimingSimpleCPU -c "/mnt/root/stream" --caches --cpu-clock="2GHz" The Exec debug output: 3558000: system.cpu: T0 : @strlen+36 : bics x4, x4, x5 : IntAlu : D=0x0000000000000000 83559000: system.cpu: T0 : @strlen+40 : bic x5, x6, x7 : IntAlu : D=0x8080808080800000 83560000: system.cpu: T0 : @strlen+44 : ccmp x5, #0, #0, eq : IntAlu : D=0x0000000000000000 83561000: system.cpu: T0 : @strlen+48 : b.eq <strlen+80> : IntAlu : 83562000: system.cpu: T0 : @strlen+52 : csel x4, x4, x5, cc : IntAlu : D=0x8080808080808000 83563000: system.cpu: T0 : @strlen+56 : movz x0, #8, #0 : IntAlu : D=0x0000000000000008 83564000: system.cpu: T0 : @strlen+60 : rev x4, x4 : IntAlu : D=0x0080808080808080 83565000: system.cpu: T0 : @strlen+64 : clz x4, x4 : IntAlu : D=0x0000000000000008 83566000: system.cpu: T0 : @strlen+68 : csel x0, xzr, x0, cc : IntAlu : D=0x0000000000000000 83567000: system.cpu: T0 : @strlen+72 : add x0, x0, x4, LSR #3 : IntAlu : D=0x0000000000000001 1 instrution need 1000 ticks, it means that 1 instrution need 2 cycles, ipc is 0.5. Is it correct? 发件人: Bobby Bruce [mailto:bbr...@ucdavis.edu<mailto:bbr...@ucdavis.edu>] 发送时间: 2021年4月27日 12:55 收件人: gem5 users mailing list <gem5-users@gem5.org<mailto:gem5-users@gem5.org>> 抄送: Liyichao <liyic...@huawei.com<mailto:liyic...@huawei.com>> 主题: Re: [gem5-users] TimingCPU's IPC Could you give a bit more info about your configuration here? To be honest, it looks like the CPU is just running at 1GHz instead of 2. Is that possible? -- Dr. Bobby R. Bruce Room 2235, Kemper Hall, UC Davis Davis, CA, 95616 web: https://www.bobbybruce.net On Fri, Apr 23, 2021 at 3:52 AM Liyichao via gem5-users <gem5-users@gem5.org<mailto:gem5-users@gem5.org>> wrote: Hi All: As I know, Atomic or Timing CPU’s IPC is 1 IPC, but when I test a program in SE mode with –debug-flags=Exec, in the debug output file, I find that one instruction’s tick is incremented by 1000, my cpu frequency is 2 GHz. Does that mean that the IPC is 0.5(cycle=1000/500)? Is the 1IPC is calculated under 1GHz? _______________________________________________ gem5-users mailing list -- gem5-users@gem5.org<mailto:gem5-users@gem5.org> To unsubscribe send an email to gem5-users-le...@gem5.org<mailto:gem5-users-le...@gem5.org> %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s _______________________________________________ gem5-users mailing list -- gem5-users@gem5.org<mailto:gem5-users@gem5.org> To unsubscribe send an email to gem5-users-le...@gem5.org<mailto:gem5-users-le...@gem5.org> %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s
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