Re: [Gems-users] Data packet transmission through network

[Niket Agarwal <niketa@xxxxxxxxxxxxx>]

I am not sure how well GEMS supports "real Network" packet transmission.

2009/7/17 harry y <yh_0116@xxxxxxxxxxx>

Hi Niket,
 
Thanks a lot for your clarification. Actually I can see the naming convention in the parsing work in Topology.C. Thanks.
 
But I still have another problem in doubt. I would like to run some inter-thread (each thread is binded to one processor) communication application on an interconnected CMP. Building the network, and setting the routes, are no problem, but transmitting a REAL packet from one processor to another poses one to me. Since Ruby is no physical network but simulation concept from my understanding, I don't expect a system call in my C code to do the data transmission (would be great if any). So how can I realize a packet/data transmission in my code, or using simics commans?
 
I guess this question is not limited to Garnet but GEMS general concepts, so any clarification would be appreciated.
 
 
Best Regards,
Harry y

 

>
> If the Network topology is FILE_SPECIFIED, the file that is looked up is
> <g_CACHE_DESIGN>_Procs-<>_ProcsPerChip-<>_L2Banks-<>_Memories-<>.txtSo, your
> file should be correctly looked up. What you did, also seems to be enough
> for the network setup.
> One thing you might want to ensure is that the tester.defaults is not
> overwriting these parameters in rubyconfig.defaults.
>
> Not sure why the parameters are not being set. Did you make any other
> changes to the vanilla gems-2.1 checkout?
>
> -Niket
>
> 2009/7/8 harry y <yh_0116@xxxxxxxxxxx>
>
> >
> > Hi Gems guys,
> > I am attempting to build a simple 2x2 mesh network using Garnet, but kind
> > of lost in the process. Could anyone give guidance on my procedure below?
> >
> > 1. I build a MSI_MOSI_CMP_directory protocol.
> > ! 2. And in rubyconfig.defaults I set the following parameters
> >
> > g_NUM_PROCESSORS: 4
> > g_NUM_L2_BANKS: 4
> > g_NUM_MEMORIES: 1
> > g_PROCS_PER_CHIP: 1
> >
> > and garnet related following the GEMS wiki
> >
> > g_NETWORK_TOPOLOGY: FILE_SPECIFIED
> > g_GARNET_NETWORK: true
> > g_DETAIL_NETWORK: true
> > g_NETWORK_TESTING: false
> > g_FLIT_SIZE: 16
> > g_VCS_PER_CLASS: 1
> > g_BUFFER_SIZE: 4
> > g_CACHE_DESIGN: MESH
> > recompiled ruby.
> >
> > 3. Then I use the NetworkFileMaker.py at
> > $GEMS/ruby/network/simple/Network_Files to generated a topology file named
> > "MESH_Procs-4_ProcsPerChip-1_L2Banks-4_Memories-1.txt"
> > I am not sure whether those are enough to create a network. Several doubts
> > are:
> >
> > 1. Which file is the FILE_SPECIFIED ! pointed to? Should it be the one
> > generated above? How doe s it recognize it?
> > 2. How should I quickly test the network? Should I follow the gen-script.py
> > and build workload to test it? Actually I run the generated tester.exec, but
> > it give the following error:
> >
> >
> > ============================================================================
> > [harry@lnx7 bin]$ ./tester.exec
> > error: in fn int confio_t::applyConfiguration(attr_value_t*) in
> > ../common/ioutil/confio.C:472: error: "g_GARNET_NETWORK" not found. unable
> > to set value.
> > error: in fn int confio_t::applyConfiguration(attr_value_t*) in
> > ../common/ioutil/confio.C:472: error: "g_DETAIL_NETWORK" not found. unable
> > to set value.
> > error: in fn int confio_t::applyConfiguration(attr_value_t*) in
> > ../common/ioutil/confio.C:472: error: "g_NETWORK_TESTING" not found. unable
> > to set value.
> &gt! ; error: in fn int confio_t::applyConfiguration(attr_value_t*) in
> > ../common/ioutil/confio.C:472: error: "g_FLIT_SIZE" not found. unable to set
> > value.
> > error: in fn int confio_t::applyConfiguration(attr_value_t*) in
> > ../common/ioutil/confio.C:472: error: "g_VCS_PER_CLASS" not found. unable to
> > set value.
> > error: in fn int confio_t::applyConfiguration(attr_value_t*) in
> > ../common/ioutil/confio.C:472: erro! r: "g_BUFFER_SIZE" not found. unable to
> > set value.
> >
> > ============================================================================
> > Does it mean Garnet is not properly configured?
> >
> > Since I am new to GEMS, any guidance is highly appreciated. Thanks!
> >
> > Best Regards,
> > Harry
> >

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