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For some reason, answering from outlook yielded the weird automatic answer
above.
Here is my answer with inline comments below.
Hello
Have generated an ARM ISA gem5.opt executable, where the PROTOCOL CHI.
Runn
Javed Osmany wrote:
> Hello Gabriel
>
> Thank you for your answers.
>
> To address the points you have raised:
>
> > > [GB] First, downstream_destination is the set of
> > possible destinations for this component. It does not mean that it will
> > actually
> > communicate will all of them. It
Hi,
"Resource stall" means that you are running out of something to perform the
transition right now.
Something can be: room in the TBE table, banks in a cache tag or data array,
space in a message buffer, etc.
All these things are grouped under the concept of resources.
Before a transition tak
If I may add, I believe the YouTube version of the tutorial probably exhibits
the same issue that was resolved in
https://gem5.atlassian.net/browse/GEM5-988?atlOrigin=eyJpIjoiMWEzZTZkMmQ4MjJjNGYxM2I1NGM3MDJjZDIzM2RhNzAiLCJwIjoiaiJ9.
I suggest checking the text version of the tutorial that has be
Hi Javed,
Please, see my comments inline.
Best,
Gabriel
Javed Osmany wrote:
> Hello
>
> Trying to understand the following:
>
> So in example config scripts I see the following:
>
> system = System() // Is this then instantiating the default overall
> system ??
This is pretty much it
Hi Zhang,
I have not tested but perhaps using one of the --cpu-type options listed in the
error message would fix your issue:
"(choose from 'O3_ARM_v7a_3', 'TimingSimpleCPU', 'ex5_big', 'DerivO3CPU',
'TraceCPU')"
O3_ARM_v7a_3 or DerivO3CPU are the closest options to "O3CPU".
Best,
Gabriel
___
Hi Vedika,
That's bad luck and slightly surprising to me that functional reads are not
implemented in Garnet.
Because you use the SE mode, functional accesses are absolutely necessary for
syscall emulation, both functional reads and writes.
Now, why do Garnet only support functional writes? Acc
BTW: the standard CHI.py configuration file does not seem to support Garnet
anyway.
You might want to use SimpleNetwork if you want CHI to work or change the
protocol if you want Garnet to work.
I don't have much experience with these other networks and protocols so I can't
help you much on this
Well, you have likely set up a nasty time bomb here.
What you are basically doing is assuming that
- Valid data contained in the network is always present in a controller as
well
- Or the backing store data (memory) is up to date.
Only in that case you can forget about the data in the network
Hi,
O3_ARM_v7a_3 comes with predefined cache configurations that correspond to this
specific CPU: O3_ARM_v7a_DCache, O3_ARM_v7a_ICache, etc.
However, these caches are effectively used only if CacheConfig.config_cache()
is called. This does not happen if --ruby is used with the fs.py and se.py
f
Hi Qishen,
Can you first assert that gem5 compiles on your environment before adding your
own code?
Then, I would recommend double-checking your SConscript file against
src/learning_gem5/part2/SConscript.
BTW: at line 248 of simple_memobj.cc: you forgot const ;)
Best,
Gabriel
It looks like you are not using the latest version of the tutorial source code.
Where did you get the tutorial source code from?
I would recommend checking out the tag v21.0.0.0 and starting from the code in
src/learning_gem5/part2.
gem5 API has recently changed and any file older than a couple o
Hi Wang,
If by "write buffer queue", you mean the "mandatoryQueue", then you cannot
restrict its size wihtout risking an assert error as the sequencer does not
check the mandatoryQueue fullness before enqueuing.
Still, the maximum number of concurrent tag array and data array lookups can be
co
If you follow each step carefully starting from here, you should be good ;) The
tutorial has been updated recently to take the latest API changes into account.
https://www.gem5.org/getting_started/
Gabriel
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Hi Javed,
I don't think that you want to use devices.CpuCluster as it is used to manage
classic caches while you want to use Ruby caches.
My first approach would be, using se.py as is:
1- Define two more options in CHI.py to specify the number of big (B) and
the number of little (L) cpus fr
Hi Javed,
2- Yes, I meant to define L1ICache_big, L1ICache_little, etc. If you need
different cache configurations. However, I didn't get that you need private
L2s. But if you call the big and little clusters by the term "cluster", then I
believe that each cluster has a single entry point to th
Hi Javed,
This is an error from the dot file processing tool.
For some reason, likely a hard coded string buffer size, it does not support
lines longer that 16384 lines.
Luckily, you don’t need it and can ignore this error.
The second error says that one of the parameters has no set value.
In yo
Hi Balls,
You can use SimObject::find for that purpose. You can get the name of
SimObjects from m5out/config.ini.
You could also implement a search-by-type template method that returns a vector
of matching SimObjects.
Something like:
static template
std::vector findSimObjects() {
std::vect
My bad, static goes before the return type.
Gabriel
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Hi Thomas,
In addition to Jason's advises, I would like to add that if a simulation
crashes your whole system, it is likely that you are running out of physical
memory. Unless you are using unstable drivers on your host, which I believe you
don't, the easiest way to unintentionally crash a syst
Hi Javed,
This looks fine to me, at least regarding L2s being private.
CHI_config.py:538 in the line where you instantiate a cache memory per CPU and
CHI_config.py:557 is the line where you instantiate the CHI ruby controller
that makes use of that cache memory instance.
One way to check if two
Hi Will,
I am not exactly sure about what your final goal is. I am assuming that you
want a coherent cacheable write issued by L1 (typically caused by a write back)
to bypass L2 and directly hit L3. I am pretty confident saying that bypassing a
single cache level in gem5's classic cache system
Hi Majid,
Which protocol are you using?
With MESI_Two_Level and MESI_Three_Level, the L1 cache has an "enable_prefetch"
boolean parameter, juste like the L0.
You can then customize the prefetcher of each cache according to the options
available in RubyPrefetcher.py.
Best,
Gabriel
__
Indeed, only MESI_two_level's L1 cache has a prefetcher, my bad. From here,
your two only options to get an L2 prefetcher is either to use MESI_two_level
or to add prefetcher support to MESI_three_level's L1 cache, which will not be
an easy job, I think.
CHI, which is a MOESI implementation, sh
This is a complex question. CHI is an ARM protocol which obviously work for ARM
ISA's... At least. Does it work for x86? There are good chances that the answer
is "yes" because x86 memory model is more restrictive than ARM's. If you need
an assertive answer though, I can't give it to you. This i
Hi Duc,
Having the print not displayed on screen does not necessarily mean that it has
not been executed. It could just have been stuck in stdout buffer which was not
flush because of an abnormal program termination.
If you initialize you data with truly random and unbounded data, "number =
bl
Hi Javed,
addSharedL2Cache is only called on lines 465 and 470 of CHI.py and these lines
are touched only if options.littleclust_l2cache == 'shared'.
You don't set it in the command line and the default value is 'private', which
explains why it never gets called.
Also I suspect that on lines 47
Indeed, gem5 is designed to be deterministic so all random number generation
should rely on a deterministically seeded random number generator. This random
number generator normally is 'random_mt' located in src/base/random.cc. However
not all random number generated in gem5 relies on this gener
Hi Javed,
Woops, I didn't see the split option in your first post. My bad.
I think the l2 is actually named "system.cpu0.l1i.downstream_destinations" and
you will find it in the ini file. I think this is due to the way gem5 sets
SimObject names. When you assign a SimObject to several object att
Hi Gogineni,
If you REALLY CAN'T modify the app, I would then replace the file(s) your app
opens with a symlink to the file you want to open.
And if you feel in a hacky mood, you can dive in src/sim/syscall_emul.hh and
hardcode path override in openatFunc. Needless to say this is a terrible lon
Hi Javed,
I don't have a reliable answer for you. It is possible that the current CHI
cache implementation cannot be shared, although it would surprise me. I would
suggest you to ping Tiago Mück who wrote this stuff to ask him about that.
On your side, you can dig in the ProtocolTrace flag outp
Hi Boya,
This is indeed an argparse glitch. I am not aware of a way to specify an option
so that the next CL argument must be considered as an argument for that option.
https://stackoverflow.com/a/16175115/11350445 confirms this behavior and
recommends using an '=' sign to specify an option's a
Hi Javed,
First a note about the relationship of classes involved in the CHI model.
The L1 and L2 CHI caches are not derived from python class RubyCache
corresponding to C++ class CacheMemory. CacheMemory is only responsible for
managing the memory of the cache, not the protocol that goes around
Hi again ;),
Yes, Ruby should support any cacheline size (at least as long as it is a power
of two).
And yes, you need to change the parameter O3CPU.fetchBufferSize and defaulted
to 64 bytes. Not sure if it has any other implications but O3_ARM_v7a_3 sets it
to 16 for instance.
Regards,
Gabrie
You need to be root to connect to the docker Daemon. You can also add yourself
to the docker group and reboot if I remember correctly.
Gabriel
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Hi Sravani,
I can't find the '1s' you are talking about.
Overall, I would recommend reading a python tutorial as well as a C++ tutorial
if you want to feel comfortable enough while reading "Learning gem5".
Dependencies are either installed using apt (or any regular package manager) or
built wi
Hi,
I already answered a similar question from you. You need to be root or to be
part of the docker Unix group as detailed here:
https://www.journaldunet.fr/web-tech/developpement/1497415-comment-corriger-l-erreur-docker-got-permission-denied/.
Again, I would strongly advise that you get famili
As already answered in your previous question, you are likely running out of
memory and Linux is killing the offending process: the gem5 link process. As
already advised, increase your VirtualBox memory to at least 6GB. Also open you
browser in your native system instead of VirtualBox as it is a
One more time: this is not a dependency error! Read carefully the lines about
being not found: this is written "WARNING". This is an OPTIONAL feature
resulting in a non fatal warning if not present.
Your problem is a couple of lines above: "fatal error: ld terminated with
signal 9 [Killed]". A
What about running scons inside the gem5 directory instead of your home
directory? And don't run it with sudo.
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Hi,
SIGTRAP is what you should observe when hitting a breakpoint, so no error
there. The missing file is probably because you did not install the system
debug files package. You probably don't need them as the bug likely happens
before calling system functions. Finally, the segmentation fault i
Just read the error message you get. It cannot be more explicit than that: The
SConstruct file is missing from your gem5_gt directory. And not knowing where
this gem5_gt directory comes from and what it contains, what can I say?
git clone https://gem5.googlesource.com/public/gem5
cd gem5
scons b
Are you talking about Ruby, Garnet and the like? It is perfectly available in
the link I gave to you. git clone will provide you with gem5 v.21.1.0.2, the
very latest stable release as of today. There is no "special" public version of
gem5 I am aware of, anyway.
The commands I gave to you are,
Hi,
Arthur's answer still stands. As he said, sim_freq is the time resolution of
the simulator itself. It defines the points in time where you are 'allowed' to
schedule events. By default, you can schedule an event every 1e-12 second of
simulated time (1THz). That does not mean all components i
Hi,
Is there a way to obtain the delta-cycle semantics of SystemC using the
existing event management features in gem5?
In other words, I would like to be able to delta-schedule an event at the
current tick doing something like eventManager.schedule(event, curTick(),
delta=true) so that it tri
Hi,
1 and 2 or inoffensive warnings. To solve 3, can you please compile gem5.debug
and provide us with the output you get with it. The callstack will contain
symbols, as opposed to the one you copy pasted. Also, can you attach your
configuration script?
Regards,
Gabriel
___
Hi,
Yes, there is. Look at the CHI protocol. It is compiled by default starting
from gem5 20.0. You can find the documentation here:
https://www.gem5.org/documentation/general_docs/ruby/CHI/
Other protocols are available in src/mem/ruby/protocol: MI, MSI, MESI and MOESI
in different flavors.
Hi Tung,
You have a bunch of test and trace CPUs available under
src/cpu/{testers,trace}. The trace CPU replays traces recorded using DerivO3CPU
while the testers generate synthetic traffic. If you want to replay your own
traces, you must either convert them to gem5 traces or implement your own
Hi,
You basically have an address map or controller hierarchy specification issue.
CHI uses a different address to machineID mapping scheme than previous
protocols. CHI adds the concept of "downstream machine" in the sense of
"downstream in the memory hierarchy". When calling
AbstractControlle
Hi Sampad,
I don't think that you can import C++ enums in SLICC in a general and sage way.
SLICC does not support "external enums" so any enum declared in SLICC will
result in a C++ enum being generated under the gem5::ruby namespace.
One way of safely using external enums (any namespace, scope
Hi,
Prefetch implementation seems unchanged and incomplete since the first release
of the CHI protocol. In particular, the notifyPf* functions in
CHI-cache-funcs.sm are still all empty. I am also not aware of any related open
Jira issues.
Regards,
Gabriel
__
Hi,
I am not aware of a roadmap for any new version on the gem5 website yet.
But you can still use the develop branch of the public gem5 repository. This is
where the latest patches are pushed on a day-to-day basis before making their
way to stable upon releases. I believe this branch to be very
Hi Daecheol,
I agree with you, m_stall_time calculation does not make much sens to me
either. It is unreliable at best if you just look at its variations from one
run to the next. And looking at it again, I think it is even bugged since the
default copy constructor for Message has been added (m
Hi Victor,
It MAY result in different results depending on which components you are using
in gem5. As stated in my post you cited, the main random number generator which
is seeded by seedRandom (random_mt) is not always used in gem5, which is an
issue. Also, not every component in gem5 support
Hi Victor,
>From what I know, you might not get "true" randomness inside the simulated
>program that easily. And it is actually a good property for a simulator: its
>behavior should not change depending on the outer world state (e.g., time). I
>would rather get the seed from the command line an
Hi Victor,
No, it won't because the random number generator that you seed with seedRandom
is independent from the one you seed inside your program. seedRandom seeds
random_mt declared in base/random.hh which is not accessible from inside your
program as of the latest version of gem5. You can ea
Hi Vipin,
The solution will depend on the way you want to retrieve your saved messages.
If you want to retrieve them in the same order you saved them, just add an
extra MessageBuffer to the cache machine, initialize it in the python script
and enqueue/dequeue in it the messages you want to save
Hi Aritra,
When a cache access misses, the cache in turns issues a request to next level
cache or memory to request the line. Depending on whether the line needs to be
read or written and other heuristics and policies, the cache will require from
the line it gets back to have certain attributes
Hi Majid,
I'm no expert in the classic cache model but let me share my understanding of
the issue.
First, did you notice there is 2 coherentXBars in your system? You have the
system XBar (system.membus) and the L1s to L2 XBar. You are currently looking
at the L1s to L2 XBar. This crossbar shou
Hi,
If I remember correctly, SimObjects are never destructed, although they have a
virtual destructor. The memory is reclaimed by the OS at process exit. Thus, I
would also recommend not using the destructor and prefer registerExitCallback().
Gabriel
Hi Scott,
This is regular use of polymorphism through virtual member functions : you
**dynamically** allocate whatever subclass of std::ostream (e.g.,
std::ofstream) and you store the returned pointer value into a pointer to base
class (std::ostream*). When deleting this pointer, independently
Hi Liyichao,
You might be in luck! A patch fixing non-HN shared CHI cache has been pushed to
develop yesterday. You can cherry-pick it here:
https://gem5-review.googlesource.com/c/public/gem5/+/56810.
You can also have a look at the patch attached to the following issue:
https://gem5.atlassian.
Hi and welcome Jianda,
You are in the right place! Feel free to subscribe to this mailing list to get
notified upon new post. You can also post any question related to gem5. You
will usually get an answer within a working day or two. You can also monitor
the Jira to learn about what is going on
Hi,
I believe what you are trying to achieve is what is commonly called a
"functional access". Though, I am not exactly sure about what is your intent
when you say that you want to "bypass caches in order to maintain coherence" as
it sounds contradictory to me.
If you chose to mix regular and
Hi,
I've also experienced long/very long link times with the GNU linker. I suggest
you try LLD, the LLVM linker that has been significantly faster for me.
Regards,
Gabriel
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Hi,
The tester got an unexpected value that triggered this panic.
Basically, the tester did not get back the latest value it wrote to the
mentioned address.
This can be caused by countless reasons.
Which protocol are you using?
If you are using your own protocol, then you likely have a bug. Good
Hi,
Just make your create declaration const in hello_object.cc.
I looks like you are a victim of a recent parameter system update that must
have introduced this const qualifier in the automatically generated python code.
Refer to SimObject documentation in src/sim/sim_object.hh. It specifically
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