Re: [Gems-users] "assertion fault"

[Alaa Alameldeen <alaa@xxxxxxxxxxx>]

The parameter L2_CACHE_NUM_SETS_BITS should be bigger than the number of 
bits required to address an L2 bank. Since you have g_NUM_L2_BANKS=256, 
you need 8 bits to map an address to an L2 bank, and the remaining bits 
are used to map to a set. So your L2_CACHE_NUM_SET_BITS should be at 
least nine (though obviously you want it to be bigger since you want 
more than one or two blocks for each cache bank).
Another alternative is to reduce the number of cache banks.

-Alaa

Alessandro Bardine wrote:
> I am using gems (MOESI_CMP_NUCA) with the following parameters and commands:
> istc-disable
> dstc-disable
> instruction-fetch-mode instruction-fetch-trace
> load-module ruby
> load-module opal
> ruby0.setparam g_NUM_PROCESSORS 8
> ruby0.setparam g_PROCS_PER_CHIP 8
> ruby0.setparam L1_CACHE_NUM_SETS_BITS 8
> ruby0.setparam L1_CACHE_ASSOC 4
> ruby0.setparam g_NUM_L2_BANKS 256
> ruby0.setparam L2_CACHE_NUM_SETS_BITS 8
> ruby0.setparam L2_CACHE_ASSOC 4
> ruby0.setparam_str g_NETWORK_TOPOLOGY FILE_SPECIFIED
> ruby0.setparam_str g_DYNAMIC_TIMEOUT_ENABLED false
> ruby0.setparam_str REMOVE_SINGLE_CYCLE_DCACHE_FAST_PATH true
> ruby0.setparam_str g_CACHE_DESIGN NUCACOL
> ruby0.setparam_str g_adaptive_routing false
> ruby0.setparam NUMBER_OF_VIRTUAL_NETWORKS 7
> ruby0.setparam g_endpoint_bandwidth 1000
> ruby0.setparam_str g_NUCA_PREDICTOR_CONFIG DNUCA
> ruby0.setparam_str ENABLE_MIGRATION true
> ruby0.setparam_str COLLECTOR_HANDLES_OFF_CHIP_REQUESTS true
> ruby0.setparam_str PERFECT_DNUCA_SEARCH true
> ruby0.init
> opal0.init
> opal0.sim-start "output-dnuca.opal"
> opal0.sim-step 3
> ruby0.dump-stats "output-dnuca.ruby"
> opal0.stats
>
>
> and I get the following error when the sim-step starts:
>
> ...
>
> opalinterface: doing notify callback
> Opal: opal-ruby link established.
> OpalInterface: installation successful.
> [0]     PC 0x418634     NPC 0x4185e4    ctx 0x0
> [1]     PC 0x418618     NPC 0x41861c    ctx 0x0
> [2]     PC 0x418624     NPC 0x418628    ctx 0x0
> [3]     PC 0x418610     NPC 0x418614    ctx 0x0
> [4]     PC 0x418618     NPC 0x41861c    ctx 0x0
> [5]     PC 0x418628     NPC 0x41862c    ctx 0x0
> [6]     PC 0x41860c     NPC 0x418610    ctx 0x0
> [7]     PC 0x418620     NPC 0x418624    ctx 0x0
> failed assertion 'L2bank < RubyConfig::numberOfL2CachePerChip()/2' at fn
> MachineID map_L1CacheMachId_to_L2CacheLocalBank(const Address&, const
> MachineID&) in slicc_interface/RubySlicc_ComponentMapping.h:171
> failed assertion 'L2bank < RubyConfig::numberOfL2CachePerChip()/2' at fn
> MachineID map_L1CacheMachId_to_L2CacheLocalBank(const Address&, const
> MachineID&) in slicc_interface/RubySlicc_ComponentMapping.h:171
> At this point you might want to attach a debug to the running and get to the
> crash site; otherwise press enter to continue
> PID: 26055
>
> Now i try to dump the ruby stats I get a file containing:
>
> ...
> L2_CACHE_NUM_SETS_BITS 0
> ...
>
> I have tried various L2 cache size for block and associativity but I always
> get the same error.
> Where am I wrong?
>
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