Re: [Gems-users] fifo buffer

[Mike Marty <mikem@xxxxxxxxxxx>]

> Thanks for your reply, Mike. I've looked at the Ruby
> network code. My current configuration is a
> 2-processor SMP system w/ SIMPLE_NETWORK
> (g_CACHE_DESIGN: NUCA). Does this mean that the
> NUCA_Procs-2_ProcsPerChip-1_L2Banks-2_Memories-2.txt
> file is used for network configuration? Or is there
> some other configuration file for SIMPLE_NETWORK?
>

To use a network file, use the FILE_SPECIFIED topology.

> Could you please tell me the format of the network
> code? For example, in
> NUCA_Procs-2_ProcsPerChip-1_L2Banks-2_Memories-2.txt,
> I understand that L1-0, L2-0, DIR-0 are connected to
> link 0 and L1-1, L2-1, DIR-1 are connected to link 1.
> Also, link 0 and link 1 are connected. Am I right? But
> I don't understand why there is no DIR-1 connection in
> NUCA_Procs-2_ProcsPerChip-2_L2Banks-2_Memories-2.txt.
>

There is both a Directory-0 and Directory-1 in that file:

processors:2
procs_per_chip:1
L2banks:2
memories:2
bw_unit:1000

ext_node:L1Cache:0 int_node:0 link_latency:1 bw_multiplier:64
ext_node:L2Cache:0 int_node:0 link_latency:1 bw_multiplier:64
ext_node:Directory:0 int_node:0 link_latency:40 bw_multiplier:10
int_node:0 int_node:1 link_latency:40 bw_multiplier:16

ext_node:L1Cache:1 int_node:1 link_latency:1 bw_multiplier:64
ext_node:L2Cache:1 int_node:1 link_latency:1 bw_multiplier:64
ext_node:Directory:1 int_node:1 link_latency:40 bw_multiplier:10


> The MessageBuffers in *.sm files are created based on
> the physical links in network code, right? If so, to
> create a fifo buffer, I should add physical links in
> network code and then create MessageBuffer in *.sm
> file, right?
>

Yes, each link has a PerfectSwitch and a Throttle.  Each of these
components includes MessageBuffers.

There are many ways to connect controllers together without using the
default network links.  One way is to extend the network code.  Another
way is to implement a special class that extends Consumer.  You can then
hook up your controllers to instatiations of this class that generates
wakeups to the controllers (see TimerTable.C for an example).  This is one
way to implement your own messaging.

--Mike