Re: [Gems-users] Physical Memory Parameters

[Brinda Ganesh <brinda_ganesh@xxxxxxxxx>]

How does ruby pass back the installed memory size
information back to simics? Im assuming that this
information is conveyed somehow so that the os can
swap things in and out of disk if the virtual memory
size gets larger than the installed physical memory
size.

I tried resetting the number of memories to 1 so that
it was not equal to the number of processors (2) in
the system but it causes the system to crash... Is
there some other parameter tha t I need to reset?

failed assertion 'id < m_nodes' at fn void
SimpleNetwork::checkNetworkAllocation(NodeID, bool,
int) in network/simple/SimpleNetwork.C:199
failed assertion 'id < m_nodes' at fn void
SimpleNetwork::checkNetworkAllocation(NodeID, bool,
int) in network/simple/SimpleNetwork.C:199

Thanks
Brinda

--- Mike Marty <mikem@xxxxxxxxxxx> wrote:

> > Could someone please tell me what the parameters
> > g_MEMORY_MODULE_BITS / g_MEMORY_MODULE_BLOCKS
> refer
> > to?
> >
> 
> These are derived from g_MEMORY_SIZE_BYTES at
> runtime in
> ruby/config/RubyConfig.C:
> 
> 
>   g_MEMORY_MODULE_BITS = g_MEMORY_SIZE_BITS -
> g_DATA_BLOCK_BITS -
> g_NUM_MEMORIES_BITS;
>   g_MEMORY_MODULE_BLOCKS = (int64(1) <<
> g_MEMORY_MODULE_BITS);
> 
> It says how many blocks of memory are in each
> CacheMemory instance (or
> each Directory/Memory controller).  By default, the
> number of memory
> modules is equal to the number of processors.  But
> you can simulate an
> arbitrary number of modules if you wanted.
> 
> > Also does the variable g_MEMORY_SIZE_BYTES refer
> also
> > to the dram capacity installed in the system?
> >
> 
> Yes.
> 
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