| From: | Ants Aasma <ants(dot)aasma(at)eesti(dot)ee> |
|---|---|
| To: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | spinlocks on HP-UX |
| Date: | 2011-08-29 21:07:18 |
| Message-ID: | CA+CSw_ufKHvpjfkcZMiFQgLnB_MkmJ_EictSn4+y6dnTdYGW_A@mail.gmail.com |
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| Lists: | pgsql-hackers |
Sorry, forgot to cc the list.
On Mon, Aug 29, 2011 at 10:12 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)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
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