Re: [bgl-discuss] Comparison between BGL nodes and standard PPCs

[Kazutomo Yoshii <kazutomo@xxxxxxxxxxx>]

Hi,

In my understanding, a compute node has 32-bit PowerPC 440(GP?) core with
double FPU.
440 is suitable for embedded purpose but it's not high perfomance cpu.
I think power3 is 64-bit.

probably, some cpu (ASIC) brief diagrams are available from Internet.

Thanks,
Kaz

>What are the major differences other than the presence of communication
>hardware between the BGL processors and other Power PC chips, Power 3, for
>example? I ask, since despite the fact that both this chip and the
>Power 3 have 2 floating point units and the rest of the unit has the
>Power PC architecture, and I use the same compiler (xlf), the performance
>I get from the 700 MHz BGL processor is less than half what I can get from
>a 375 MHz Power 3, even when I use the -qarch=440d.
>                                   Don Sinclair
>
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