From: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
---|---|
To: | Andrew Dunstan <andrew(at)dunslane(dot)net> |
Cc: | Gregory Stark <stark(at)enterprisedb(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Straightforward changes for increased SMP scalability |
Date: | 2007-07-16 16:04:41 |
Message-ID: | 469B9719.1000604@commandprompt.com |
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Thread: | |
Lists: | pgsql-hackers |
Andrew Dunstan wrote:
>
>
> Joshua D. Drake wrote:
>> Gregory Stark wrote:
>>> "Joshua D. Drake" <jd(at)commandprompt(dot)com> writes:
>>>
>> If I have 16 cores, things are still really loud but I start to not be
>> able to tell the difference. The percentage of improvement is much lower.
>>
>> E.g, 16 cores works and PostgreSQL work great, but it is not nearly as
>> fantastic with 16 cores as 8 cores (in terms percentage gain).
>>
> That's not the same thing as slowing down, it just means that scaling
> isn't always linear, which isn't surprising.
Right. Which is why I reposted, but it also makes what Simon proposes
that much more attractive *because* it helps the linear problem (in theory).
Joshua D. Drake
>
> cheers
>
> andrew
>
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