From: movead.li@highgo.ca <movead.li@highgo.ca>
To: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Cc: bruce <bruce@momjian.us>
Cc: ahsan.hadi <ahsan.hadi@highgo.ca>
Cc: robertmhaas <robertmhaas@gmail.com>
Cc: thomas.munro <thomas.munro@gmail.com>
Cc: pgsql-hackers <pgsql-hackers@postgresql.org>
Cc: sfrost <sfrost@snowman.net>
Subject: Re: Append with naive multiplexing of FDWs
Date: Wed, 29 Jan 2020 17:58:57 +0800
Message-ID: <2020012917585385831113@highgo.ca> (raw)
References: <20200115204104.GC7201@momjian.us>
<20200116.155002.263144408387928025.horikyota.ntt@gmail.com>
<16ff008362d.edad0e7a133214.1991835179355654367@highgo.ca>
<20200129.173935.1752784195747118665.horikyota.ntt@gmail.com>
Hello,
>It is "asynchronous append on async-capable'd postgres-fdw scans". It
>could be called as such in the sense that it is intended to be used
>with sharding.
Yes that's it.
>Did you looked at my benchmarking result upthread? Even it gives
>significant gain even when gathering large number of tuples from
>multiple servers or even from a single server. It is because of its
>asynchronous nature.
I mean it gain performance at first, but it mets bottleneck while
increase the number of the nodes.
For example:
It has 2 nodes, it will gain 200% performance.
It has 3 nodes, it will gain 300% performance.
However,
It has 4 nodes, it gain 300% performance.
It has 5 nodes, it gain 300% performance.
...
----
Highgo Software (Canada/China/Pakistan)
URL : www.highgo.ca
EMAIL: mailto:movead(dot)li(at)highgo(dot)ca
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To: pgsql-hackers@postgresql.org
Cc: movead.li@highgo.ca, horikyota.ntt@gmail.com, bruce@momjian.us, ahsan.hadi@highgo.ca, robertmhaas@gmail.com, thomas.munro@gmail.com, sfrost@snowman.net
Subject: Re: Append with naive multiplexing of FDWs
In-Reply-To: <2020012917585385831113@highgo.ca>
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