Sniper configuration file

[abdulla...@brown.edu]

Hi, 

I am trying to use Sniper to model an AMD quad-core processor Athlon II x4. Is there any configuration file provided in Sniper to model such a processor? If I change the nehalem based config file, or gainstown provided with Sniper according to the specifications such as L1/L2 sizes, will it be a good approximate? 

At the moment, when I run McPat with Sniper with the gainstown and nehalem configuration file, it only gives me power for cores, different blocks in the cores , L1, and L2 cache, and bus power(very minimal). I am wondering what about the power for DDR memory controllers and I/Os? Is the total power provided by McPat consider the power from I/Os and memory controllers?

Thanks, 

Nowroz

[Trevor E. Carlson]

Nowroz,

There are many differences between the Intel and AMD micro-architecture, but you are right that a starting point would be to configure the cache configuration to match the system that you would like to model. The next step could be to model the instruction latencies and port interfaces. You will have to create a new core model based on your architecture. Take a look at sniper/common/performance_model/performance_models/core_model/core_model_nehalem.cc for an example, and update the core_model.cc file to enable your new core model. You'll have to think about the level of detail that you experiments require to determine how much of your core that you will need to model, compared to using the current models.

McPAT is computing the memory controller energy use. Take a look at their source code for additional details there. We added a basic DRAM I/O energy model and you can see the details of that in the sniper/tools/mcpay.py file.

Trevor

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[Ada Shaine]

Hello Trevor,

I just started using Sniper7.2. I want to know how we can change the number of cores(for example from 4 cores as default in small.cfg file to 8, and to 16)?

On Wednesday, March 27, 2013 at 1:37:50 AM UTC-6, Trevor E. Carlson wrote:

Nowroz,

There are many differences between the Intel and AMD micro-architecture, but you are right that a starting point would be to configure the cache configuration to match the system that you would like to model. The next step could be to model the instruction latencies and port interfaces. You will have to create a new core model based on your architecture. Take a look at sniper/common/performance_model/performance_models/core_model/core_model_nehalem.cc for an example, and update the core_model.cc file to enable your new core model. You'll have to think about the level of detail that you experiments require to determine how much of your core that you will need to model, compared to using the current models.

McPAT is computing the memory controller energy use. Take a look at their source code for additional details there. We added a basic DRAM I/O energy model and you can see the details of that in the sniper/tools/mcpay.py file.

Trevor

On Mar 26, 2013, at 11:09 PM, abdulla...@brown.edu wrote:

Hi, 

I am trying to use Sniper to model an AMD quad-core processor Athlon II x4. Is there any configuration file provided in Sniper to model such a processor? If I change the nehalem based config file, or gainstown provided with Sniper according to the specifications such as L1/L2 sizes, will it be a good approximate? 

At the moment, when I run McPat with Sniper with the gainstown and nehalem configuration file, it only gives me power for cores, different blocks in the cores , L1, and L2 cache, and bus power(very minimal). I am wondering what about the power for DDR memory controllers and I/Os? Is the total power provided by McPat consider the power from I/Os and memory controllers?

Thanks, 

Nowroz

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[Trevor E. Carlson]

Ada,

If you pass the -n parameter to Sniper on the command line, you’ll be able to set the number of cores to run.

For example:

$SNIPER_ROOT/run-sniper -n 4 -- $SNIPER_ROOT/test/fft/fft -p 4

Good luck,

Trevor

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[Ada Shaine]

Thank you Trevor,

I have another question: suppose we are trying to find the best cache which actually means having the lowest execution time by changing values of associativity and cache-size on RADIX, and if we are asked to repeat the analysis for FFT, do we need to change anything apart from the changes we made in RADIX for each cache?

Good luck,

Trevor

[ahmad sedigh]

Hi Ada

To the best of my knowledge, you can enforce any desired changes on configuration file using -g in command line for example :

$SNIPER_ROOT/run-sniper -n 4 -c gainestown -g --network/memory_model_1=emesh_hop_by_hop  -- $SNIPER_ROOT/test/fft/fft -p 4

this means that the sniper should pass 4 cores with the configuration of gainestown core with the emesh_hop_by_hop memory model in network for running 4 programs of fft.

the -c is for core configuration and -g changes any types of desired configs.

for further information look at the sniper manual provided in snipersim.org

also after every time running sniper you can investigate to the sim.cfg file created in current directory to see what configurations have been taken for the simulation.