[Gems-users] Number of instructions executed in multi-core simulation

[sparsh mittal ISU <sparsh@xxxxxxxxxxx>]

Hello 
I made a checkpoint configuration for abisko, using $num_cpus=2.
I ran the following the code:

instruction-fetch-mode instruction-fetch-trace
...(other steps for initialization)...
load-module ruby
ruby0.setparam g_NUM_PROCESSORS 2
ruby0.init

load-module opal
opal0.init
opal0.sim-start opaloutput
date ; opal0.sim-step 50000 ; date ; 
ruby0.dump-stats file1;
Here is the part of the statistics I got:

instruction_executed: 141754 [ 50004 91750 ]
simics_cycles_executed: 4 [ 2 2 ]
cycles_per_instruction: 0.747591 [ 1.05966 0.577515 ]
misses_per_thousand_instructions: 4.59246 [ 7.4394 3.04087 ]

If I see the opal/system/system.C file, then the following loop in the function void system_t::simulate( uint64 instrCount )
while ( m_sim_status == SIMSTATUS_OK &&
          instrCount >= m_seq[0]->m_stat_committed[0] ) { ...}

it just takes into account the instructions committed in core 1 and not in core 2. So the core 2 has executed 91750, while core 1 has done (as expected) 50004 instructions.
Is the difference right(expected). If not, is  it possible that the instructions executed be quite close to 50000?

I would very much appreciate the explanation.



-- 
Thanks and Regards
Sparsh Mittal
Graduate Student
Electrical and Computer Engineering
Iowa State University, Iowa, USA