[gem5-users] What is the default coherence mechanism in gem5 for multicore systems?
Hi all, I am currently running simulation in a multicore processor. I connect the memory system as follow: for i in range(np): system.cpu[i].icache = L1_ICache() system.cpu[i].dcache = L1_DCache() system.cpu[i].icache.connectCPU(system.cpu[i]) system.cpu[i].dcache.connectCPU(system.cpu[i]) system.l2cache = L2Cache() system.l2bus = L2XBar() #np means number of processor and it is a parameter for i in range(np): system.cpu[i].icache.connectBus(system.l2bus) system.cpu[i].dcache.connectBus(system.l2bus) system.l2cache.connectCPUSideBus(system.l2bus) system.l2cache.connectMemSideBus(system.membus) In summary, to each core I have private Icache and Dcache which are connected to an L2 shared cache. So, my question is: how is the coherence guaranteed in the system, since I do not provide this information in my configuration file? Is there a default coherency used in the gem5? If so, which is it? Thanks in advance. -- Francisco Carlos Silva Junior Ph.D student at University of Brasilia ___ gem5-users mailing list gem5-users@gem5.org http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
Re: [gem5-users] What is the default coherence mechanism in gem5 for multicore systems?
Hi, The default is MI protocol in classic cache model, there are various protocols which you can find in build_opts directory. Also, you can find the build info by using —build-info flag. For example ./build/X86/gem5.opt —build-info On Wed, Dec 11, 2019 at 10:11 AM Francisco Carlos wrote: > Hi all, > > I am currently running simulation in a multicore processor. I connect the > memory system as follow: > > for i in range(np): > system.cpu[i].icache = L1_ICache() > system.cpu[i].dcache = L1_DCache() > system.cpu[i].icache.connectCPU(system.cpu[i]) > system.cpu[i].dcache.connectCPU(system.cpu[i]) > > system.l2cache = L2Cache() > system.l2bus = L2XBar() > > #np means number of processor and it is a parameter > for i in range(np): > system.cpu[i].icache.connectBus(system.l2bus) > system.cpu[i].dcache.connectBus(system.l2bus) > system.l2cache.connectCPUSideBus(system.l2bus) > system.l2cache.connectMemSideBus(system.membus) > In summary, to each core I have private Icache and Dcache which are > connected to an L2 shared cache. > > So, my question is: how is the coherence guaranteed in the system, since I > do not provide this information in my configuration file? Is there a > default coherency used in the gem5? If so, which is it? > > Thanks in advance. > > > -- > Francisco Carlos Silva Junior > Ph.D student at University of Brasilia > > ___ > gem5-users mailing list > gem5-users@gem5.org > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users ___ gem5-users mailing list gem5-users@gem5.org http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
Re: [gem5-users] What is the default coherence mechanism in gem5 for multicore systems?
The PROTOCOL env var (available in build_opts) is used in Ruby only. For the classic memory system, MOESI is used. Giacomo From: gem5-users on behalf of Abhishek Singh Sent: 11 December 2019 16:32 To: gem5 users mailing list Subject: Re: [gem5-users] What is the default coherence mechanism in gem5 for multicore systems? Hi, The default is MI protocol in classic cache model, there are various protocols which you can find in build_opts directory. Also, you can find the build info by using —build-info flag. For example ./build/X86/gem5.opt —build-info On Wed, Dec 11, 2019 at 10:11 AM Francisco Carlos mailto:juninho.u...@hotmail.com>> wrote: Hi all, I am currently running simulation in a multicore processor. I connect the memory system as follow: for i in range(np): system.cpu[i].icache = L1_ICache() system.cpu[i].dcache = L1_DCache() system.cpu[i].icache.connectCPU(system.cpu[i]) system.cpu[i].dcache.connectCPU(system.cpu[i]) system.l2cache = L2Cache() system.l2bus = L2XBar() #np means number of processor and it is a parameter for i in range(np): system.cpu[i].icache.connectBus(system.l2bus) system.cpu[i].dcache.connectBus(system.l2bus) system.l2cache.connectCPUSideBus(system.l2bus) system.l2cache.connectMemSideBus(system.membus) In summary, to each core I have private Icache and Dcache which are connected to an L2 shared cache. So, my question is: how is the coherence guaranteed in the system, since I do not provide this information in my configuration file? Is there a default coherency used in the gem5? If so, which is it? Thanks in advance. -- Francisco Carlos Silva Junior Ph.D student at University of Brasilia ___ gem5-users mailing list gem5-users@gem5.org<mailto:gem5-users@gem5.org> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. ___ gem5-users mailing list gem5-users@gem5.org http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
Re: [gem5-users] What is the default coherence mechanism in gem5 for multicore systems?
Thank you for the clarification. On Wed, Dec 11, 2019 at 11:40 AM Giacomo Travaglini < giacomo.travagl...@arm.com> wrote: > The PROTOCOL env var (available in build_opts) is used in Ruby only. > For the classic memory system, MOESI is used. > > Giacomo > -- > *From:* gem5-users on behalf of Abhishek > Singh > *Sent:* 11 December 2019 16:32 > *To:* gem5 users mailing list > *Subject:* Re: [gem5-users] What is the default coherence mechanism in > gem5 for multicore systems? > > Hi, > The default is MI protocol in classic cache model, there are various > protocols which you can find in build_opts directory. > Also, you can find the build info by using —build-info flag. > For example ./build/X86/gem5.opt —build-info > > On Wed, Dec 11, 2019 at 10:11 AM Francisco Carlos < > juninho.u...@hotmail.com> wrote: > > Hi all, > > I am currently running simulation in a multicore processor. I connect the > memory system as follow: > > for i in range(np): > system.cpu[i].icache = L1_ICache() > system.cpu[i].dcache = L1_DCache() > system.cpu[i].icache.connectCPU(system.cpu[i]) > system.cpu[i].dcache.connectCPU(system.cpu[i]) > > system.l2cache = L2Cache() > system.l2bus = L2XBar() > > #np means number of processor and it is a parameter > for i in range(np): > system.cpu[i].icache.connectBus(system.l2bus) > system.cpu[i].dcache.connectBus(system.l2bus) > system.l2cache.connectCPUSideBus(system.l2bus) > system.l2cache.connectMemSideBus(system.membus) > In summary, to each core I have private Icache and Dcache which are > connected to an L2 shared cache. > > So, my question is: how is the coherence guaranteed in the system, since I > do not provide this information in my configuration file? Is there a > default coherency used in the gem5? If so, which is it? > > Thanks in advance. > > > -- > Francisco Carlos Silva Junior > Ph.D student at University of Brasilia > > ___ > gem5-users mailing list > gem5-users@gem5.org > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users > > IMPORTANT NOTICE: The contents of this email and any attachments are > confidential and may also be privileged. If you are not the intended > recipient, please notify the sender immediately and do not disclose the > contents to any other person, use it for any purpose, or store or copy the > information in any medium. Thank you. > ___ gem5-users mailing list gem5-users@gem5.org http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
Re: [gem5-users] What is the default coherence mechanism in gem5 for multicore systems?
No problem! 🙂 From: Abhishek Singh Sent: 11 December 2019 16:59 To: Giacomo Travaglini Cc: gem5 users mailing list Subject: Re: [gem5-users] What is the default coherence mechanism in gem5 for multicore systems? Thank you for the clarification. On Wed, Dec 11, 2019 at 11:40 AM Giacomo Travaglini mailto:giacomo.travagl...@arm.com>> wrote: The PROTOCOL env var (available in build_opts) is used in Ruby only. For the classic memory system, MOESI is used. Giacomo From: gem5-users mailto:gem5-users-boun...@gem5.org>> on behalf of Abhishek Singh mailto:abhishek.singh199...@gmail.com>> Sent: 11 December 2019 16:32 To: gem5 users mailing list mailto:gem5-users@gem5.org>> Subject: Re: [gem5-users] What is the default coherence mechanism in gem5 for multicore systems? Hi, The default is MI protocol in classic cache model, there are various protocols which you can find in build_opts directory. Also, you can find the build info by using —build-info flag. For example ./build/X86/gem5.opt —build-info On Wed, Dec 11, 2019 at 10:11 AM Francisco Carlos mailto:juninho.u...@hotmail.com>> wrote: Hi all, I am currently running simulation in a multicore processor. I connect the memory system as follow: for i in range(np): system.cpu[i].icache = L1_ICache() system.cpu[i].dcache = L1_DCache() system.cpu[i].icache.connectCPU(system.cpu[i]) system.cpu[i].dcache.connectCPU(system.cpu[i]) system.l2cache = L2Cache() system.l2bus = L2XBar() #np means number of processor and it is a parameter for i in range(np): system.cpu[i].icache.connectBus(system.l2bus) system.cpu[i].dcache.connectBus(system.l2bus) system.l2cache.connectCPUSideBus(system.l2bus) system.l2cache.connectMemSideBus(system.membus) In summary, to each core I have private Icache and Dcache which are connected to an L2 shared cache. So, my question is: how is the coherence guaranteed in the system, since I do not provide this information in my configuration file? Is there a default coherency used in the gem5? If so, which is it? Thanks in advance. -- Francisco Carlos Silva Junior Ph.D student at University of Brasilia ___ gem5-users mailing list gem5-users@gem5.org<mailto:gem5-users@gem5.org> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. ___ gem5-users mailing list gem5-users@gem5.org http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
Re: [gem5-users] What is the default coherence mechanism in gem5 for multicore systems?
Thank you both, Abhishek and Giocomo, for your quick reply. -- Francisco Carlos Silva Junior Ph.D Student De: gem5-users em nome de Giacomo Travaglini Enviado: quarta-feira, 11 de dezembro de 2019 14:02 Para: Abhishek Singh Cc: gem5 users mailing list Assunto: Re: [gem5-users] What is the default coherence mechanism in gem5 for multicore systems? No problem! 🙂 From: Abhishek Singh Sent: 11 December 2019 16:59 To: Giacomo Travaglini Cc: gem5 users mailing list Subject: Re: [gem5-users] What is the default coherence mechanism in gem5 for multicore systems? Thank you for the clarification. On Wed, Dec 11, 2019 at 11:40 AM Giacomo Travaglini mailto:giacomo.travagl...@arm.com>> wrote: The PROTOCOL env var (available in build_opts) is used in Ruby only. For the classic memory system, MOESI is used. Giacomo From: gem5-users mailto:gem5-users-boun...@gem5.org>> on behalf of Abhishek Singh mailto:abhishek.singh199...@gmail.com>> Sent: 11 December 2019 16:32 To: gem5 users mailing list mailto:gem5-users@gem5.org>> Subject: Re: [gem5-users] What is the default coherence mechanism in gem5 for multicore systems? Hi, The default is MI protocol in classic cache model, there are various protocols which you can find in build_opts directory. Also, you can find the build info by using —build-info flag. For example ./build/X86/gem5.opt —build-info On Wed, Dec 11, 2019 at 10:11 AM Francisco Carlos mailto:juninho.u...@hotmail.com>> wrote: Hi all, I am currently running simulation in a multicore processor. I connect the memory system as follow: for i in range(np): system.cpu[i].icache = L1_ICache() system.cpu[i].dcache = L1_DCache() system.cpu[i].icache.connectCPU(system.cpu[i]) system.cpu[i].dcache.connectCPU(system.cpu[i]) system.l2cache = L2Cache() system.l2bus = L2XBar() #np means number of processor and it is a parameter for i in range(np): system.cpu[i].icache.connectBus(system.l2bus) system.cpu[i].dcache.connectBus(system.l2bus) system.l2cache.connectCPUSideBus(system.l2bus) system.l2cache.connectMemSideBus(system.membus) In summary, to each core I have private Icache and Dcache which are connected to an L2 shared cache. So, my question is: how is the coherence guaranteed in the system, since I do not provide this information in my configuration file? Is there a default coherency used in the gem5? If so, which is it? Thanks in advance. -- Francisco Carlos Silva Junior Ph.D student at University of Brasilia ___ gem5-users mailing list gem5-users@gem5.org<mailto:gem5-users@gem5.org> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. ___ gem5-users mailing list gem5-users@gem5.org http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
