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Hi Fabien,
Fabien COELHO schrieb am 19.02.2016 um 16:04:
>
>>> [...] Ubuntu 12.04 LTS (precise)
>>
>> That's with 12.04's standard kernel?
>
> Yes.
Kernel 3.2 is extremely bad for Postgresql, as the vm seems to amplify IO somehow. The difference
to 3.13 (the latest LTS kernel for 12.04) is huge.
https://medium.com/postgresql-talk/benchmarking-postgresql-with-different-linux-kernel-versions-on-ubuntu-lts-e61d57b70dd4#.6dx44vipu
You might consider upgrading your kernel to 3.13 LTS. It's quite easy normally:
https://wiki.ubuntu.com/Kernel/LTSEnablementStack
/Patric
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