Sorry, forgot to cc the list.
On Mon, Aug 29, 2011 at 10:12 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Also, if the PPC machine really is hyperthreaded (the internal webpage
> for it says "Hyper? True" but /proc/cpuinfo doesn't provide any clear
> indications), that might mean it's not going to scale too well past 16x
> the single-thread case.
According to IBM docs [1], 8406-71Y contains one 8 core POWER7 chip
that is 4-way multi-threaded and has 4 memory channels. X4600M2 should
have 16 memory channels, although at 2/3 the transfer rate. 6GB of
memory is a strange amount for the IBM, according to specs it should take
4 or 8GB DIMMs in pairs. Sounds like the server is split into multiple
partitions.
--
Ants Aasma
[1] http://www.redbooks.ibm.com/redpapers/pdfs/redp4655.pdf