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spinlocks on HP-UX

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 (view raw or flat)
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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

[1] http://www.redbooks.ibm.com/redpapers/pdfs/redp4655.pdf

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