Re: [Gems-users] how to construct a CMP system with 32 or 64 cores

["Bruno Coutinho" <coutinho@xxxxxxxxxxx>]

You can create a serengeti machine up to 64 cores using a cluster configuration and fake several serengeti machines into one.

Caution: the system will have holes in numbering CPU numbering:
0-24
25-56
57-72

This is due that in serengeti architecture 8 of the 32 machines slots must be populated by I/O cards.

Here are links showing how to do this (from simics forum):
https://www.simics.net/mwf/topic_show.pl?tid=9375

2008/5/22 Guoqiang Yang <nkyangguoqiang@xxxxxxxxx>:

Hi there,

I'm now wondering how we could figure a CMP system with 32, 64 or even
more # of cores. To be precisely, Opal only decodes ultrasparc III ISA
while serengeti could only support up to 24 CPUs. And when I modified
the include file "serengeti-6800-system.include" in simics and try to
make a checkpoint, I got the following errors:
================
Cannot connect 'system_cmp0' to 'board_cmp6'. The 'system_cmp0'
component does not have any 'cpu-slot6' connector.

[./serengeti-6800-system.include:37] the command did not complete
properly; interrupting script
================

Could someone please kindly help me out?

Many thanks,

Guoqiang Yang

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