Re: [gem5-users] x86 floating point instruction

[Tariq Azmy]

Thanks Gabe. Yeah it does not impact the program but it's just that the
statistic is incorrect.

By the way, I applied the patch and stats now shows correct micro-ops
entries.

Appreciate your help. Thanks again

On Wed, May 23, 2018 at 6:51 PM, Gabe Black  wrote:

> Yep, those microops aren't given a operand class, and so the isa parser is
> guessing and making the FloatAddOp. I haven't really tested this beyond
> making sure it compiles, but here's a patch that might get this working for
> you.
>
> https://gem5-review.googlesource.com/c/public/gem5/+/10541
>
> Gabe
>
> On Wed, May 23, 2018 at 4:13 PM, Gabe Black  wrote:
>
>> I'm confident they aren't implemented with floating point add. It's
>> likely either that the microops are misclassified, or they're unimplemented
>> and printing a warning, but the fact that they don't actually do any math
>> isn't impacting your program for whatever reason. I'll take a quick look.
>>
>> Gabe
>>
>> On Wed, May 23, 2018 at 2:07 PM, Tariq Azmy 
>> wrote:
>>
>>> Hi,
>>>
>>> I wrote simple code that does simple floating point multiplication and
>>> division operation and from the assembly, I can see there are MULSS and
>>> DIVSS instructions. But after I ran the simulation on gem5 and looked at
>>> the stat.txt, I can only see the entries in 
>>> system.cpu.iq.FU_type_0::FloatAdd,
>>> where as the entries in FloatMul and FloatDiv remains 0.
>>>
>>> If I understand correctly, these stats refer to the micro-ops. Does that
>>> mean the MULSS and DIVSS instruction are broken down and executed with
>>> floating point Add?
>>>
>>> Thanks
>>>
>>>
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>>
>>
>
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[gem5-users] x86 floating point instruction

[Tariq Azmy]

Hi,

I wrote simple code that does simple floating point multiplication and
division operation and from the assembly, I can see there are MULSS and
DIVSS instructions. But after I ran the simulation on gem5 and looked at
the stat.txt, I can only see the entries in
system.cpu.iq.FU_type_0::FloatAdd, where as the entries in FloatMul and
FloatDiv remains 0.

If I understand correctly, these stats refer to the micro-ops. Does that
mean the MULSS and DIVSS instruction are broken down and executed with
floating point Add?

Thanks
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[gem5-users] Failed to find stat 'system.bigCluster.clk_domain.clock' and others

[Yara Gowayed]

Hi all

I am currently working on power modeling using gem5 for arm bigLITTLE
architecture. I am using the fs_power.py script already found in the gem5
repo but I wanted to change the dummy equations for static and dynamic
power to more meaningful equations.
The stats I need to do so are all found in stats.txt but when I try to
formulate the equations it gives me "failed to find stat" error.

I already can use some stats like dcache.overall_misses ,
dcache.overall_accesses,
numCycles,voltage, dtb_walker_cache.overall_misses, icache.overall_misses ,
icache.overall_accesses.
 But when it comes to :
system.clk_domain.clock,system.bigCluster.cpus0.iew.iewExecutedInsts,system.
bigCluster.cpus2.iq.FU_type_0::IntAlu or any other instructions(MULT,DIV)
it fails.

I kind of have an intuition where the problem is, I went through the
documentation of doxygen and all the stats that failed needs to be accessed
from a certain object that I dont know.

For example the stats::overall_misses should be accessed from BaseCache
class and I did so in dcache.overall_misses but for the others I tried to
do the same and it failed.

Any clue how to be able to access the given stats? It doesn't have to be
per core a sum of them will do the same job.

Also I tried to do the calculations after the simulation ends using scripts
that process data from the stats.txt and that worked, I just want it now to
be online during the simulation.

Thanks alot!
Yara
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[gem5-users] parsec3.0 compilation by aarch64-linux-gnu-gcc cross compiler.

[commerce _com]

I installed aarch64-linux-gnu-gcc cross compiler in my ubuntu system to
compile parsec3.0, and I typed the following commands:

source ./env.sh
parsecmgmt -a build -c gcc-hooks -p blackscholes

and I found this compilation result:

[PARSEC] Packages to build:  parsec.blackscholes

[PARSEC] [== Building package parsec.blackscholes [1] ==]
[PARSEC] [-- Analyzing package parsec.blackscholes --]
[PARSEC] Package parsec.blackscholes already exists, proceeding.
[PARSEC]
[PARSEC] BIBLIOGRAPHY
[PARSEC]
[PARSEC] [1] Bienia. Benchmarking Modern Multiprocessors. Ph.D. Thesis,
2011.
[PARSEC]
[PARSEC] Done.

*nb*:I found the binarie in the following path:

/parsec-3.0/pkgs/apps/blackscholes/inst/amd64-linux.gcc-hooks/bin/
blackscholes

please is this method true?


thanks.
commerce.
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[gem5-users] Terminating multi-core simulation

[Muhammad Avais]

Dear All,

 I want to measure dynamic energy of L2 cache for multi-core
simulations. For this purpose, i measure stats from gem5 like # of hits,  #
of misses and # of writebacks.
 As, multi-core simulation in gem5 terminates, as soon as, any workload
reaches maximum count. Therefore, while comparing different schemes, each
scheme terminates after different number of instructions, so stats like  #
of hits,  # of misses and # of writebacks are not useful.
   Is there any  other metric that can be used to compare energy in
multicore systems like weighted speed up for performance. Or is it possible
that simulation always runs for fixed number of instruction.

Many Thanks,
Best Regards,
Avais
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