On Wed, Apr 19, 2017 at 12:48 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Alvaro Herrera <alvherre@2ndquadrant.com> writes:
>> Tom Lane wrote:
>>> FWIW, I'm a bit suspicious of relocating the temp stats directory as
>>> being a reliable fix for this.
>
>> It's an SD card (the kind typically used in cameras and phones), not SSD.
>> Saying it's slow is an understatement. It's *excruciatingly* slow.
>
> Oh, I misread it ... but still, the modern definition of "excruciatingly
> slow" doesn't seem all that far off what 90s-era hard drives could do.
> It is clear from googling though that there's an enormous performance
> range in SD cards' random write performance, eg wikipedia's entry has
> a link to
>
> http://goughlui.com/2014/01/16/testing-sd-card-performance-round-up/
>
> Seems like it's hard to judge this without knowing exactly which
> SD card Michael has got in that thing.
Professional micro SD HC 8GB, with class 10, which is utterly slow in
the things I have tested up to now and of course I cannot find its
read/write properties. I had a SanDisk class 10 in it that died some
months ago, and that was way faster. RIP.
--
Michael
