[gem5-users] m5ops with RISCV

[Vanchinathan Venkataramani]

Dear all

I would like to collect performance counters for a RISCV binary in gem5.

Is there a util/m5 patch for generating m5ops for RISCV? Any help really
appreciated.

Best regards
V Vanchinathan
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[gem5-users] About multiple cache copies and a related comment called "on the same path to memory"

[Gongjin Sun]

Hi All,

I noticed that there are some useful comments in the file cache.cc as like
these:

"// if a cache is responding, and it had the line in Owned
// rather than Modified state, we need to invalidate any
// copies that are not on the same path to memory
"
"// we get away with multiple caches (on
// the same path to memory) considering
// the block writeable as we always enter
// the cache hierarchy through a cache,
// and first snoop upwards in all other
// branches"

What is the meaning of "on the same path to memory"?

Assume we have two cpus and 3 cache levels. The third level is shared by
these two cpus. And packet is in the level 2 (L2) of cpu1 currently. If I
understand it correctly, taking the first comment for example,

the cache which is responding is L1 of cpu1, the "on the same path to
memory" means the path from current L2 of cpu1 to to L3 to memory and the
copies which need to be invalidated should be the ones from L1, L2 of cpu2
(not including the copies of L3) . Is my understanding correct? Please
correct me and clarify it if not.

Thanks in advance!

gjins
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[gem5-users] Fault injection by changing the instructions.

[Nidhi Kamath]

Hello,

I am running a simple program on gem5 SE mode , The program is as below



*int a = 2;int b = 3;b = a+12;*

In b=a+12 , the value of a is *loaded*, summed with 12 and *stored* in b.

Instead of executing the load a, I want to change it to store a , Is there
a way I can do it in Gem5 , If yes, then what changes should I be making.

Help would be appreciated.

Regards
Nidhi
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Re: [gem5-users] No module named google.protobuf

[tmn vnbl]

Hi all,

I'm sorry, the error occured during decoding of the trace, not during
playback.
During playback I get (a probably related error):


panic: Could not open fetchtrace.proto.gz for reading


where fetchtrace is my generated instruction trace file.


On Mon, Dec 18, 2017 at 3:16 PM, tmn vnbl  wrote:

> Hi all,
>
> I was running an instruction trace example using gem5, but I ran into this
> error when trying to replay the trace (generating the trace was not a
> problem):
>
>
> ImportError: No module named google.protobuf
>
> It seems like it cannot find protobuf, but however it is installed as the
> trace can be generated and during compilation of gem5, the check for
> protobuf passes as well.
>
> It seems like this is some python related error for protobuf. Do I have to
> build more than the c++ source of protobuf? My protobuf is in a custom
> location in which I have write access.
>
> Thanks for any hint,
>
> Timon
>
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[gem5-users] No module named google.protobuf

[tmn vnbl]

Hi all,

I was running an instruction trace example using gem5, but I ran into this
error when trying to replay the trace (generating the trace was not a
problem):


ImportError: No module named google.protobuf

It seems like it cannot find protobuf, but however it is installed as the
trace can be generated and during compilation of gem5, the check for
protobuf passes as well.

It seems like this is some python related error for protobuf. Do I have to
build more than the c++ source of protobuf? My protobuf is in a custom
location in which I have write access.

Thanks for any hint,

Timon
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