From: | Thomas Güttler <guettliml(at)thomas-guettler(dot)de> |
---|---|
To: | pgsql-general(at)lists(dot)postgresql(dot)org |
Subject: | Re: Script which shows performance of ByteA: ascii vs binary |
Date: | 2019-03-22 13:04:15 |
Message-ID: | f3d5b062-d0e2-3d28-b12d-7b216b47b7b3@thomas-guettler.de |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-general |
Am 22.03.19 um 13:40 schrieb Francisco Olarte:
> Thomas:
>
> On Fri, Mar 22, 2019 at 11:22 AM Thomas Güttler
> <guettliml(at)thomas-guettler(dot)de> wrote:
>> Thank you for asking several times for a benchmark.
>> I wrote it now and it is visible: inserting random bytes into bytea is much slower,
>> if you use the psycopg2 defaults.
>> Here is the chart:
>> https://github.com/guettli/misc/blob/master/bench-bytea-inserts-postrgres.png
>> And here is the script which creates the chart:
>> https://github.com/guettli/misc/blob/master/bench-bytea-inserts-postrgres.py
>
> I'm not too sure, but I read ( in the code ) you are measuring a
> nearly not compressible urandom data againtst a highly compressible (
> 'x'*i ) data,
> are you sure the difference is not due to data being compressed and
> generating much less disk usage in toast-tables/wal?
+1
for this case toast-tables/wal is a detail of the implementation.
This tests does not care about the "why it takes longer". It just generates
a performance chart.
Yes, it does exactly what you say: it compares
nearly not compressible urandom data against a highly compressible data.
In my case, will get nearly random data (binary PDF, JPG, ...). And that's why
I wanted to benchmark it.
Regards,
Thomas
--
Thomas Guettler http://www.thomas-guettler.de/
I am looking for feedback: https://github.com/guettli/programming-guidelines
From | Date | Subject | |
---|---|---|---|
Next Message | Tom Lane | 2019-03-22 14:11:48 | Re: How to check is connection encrypted |
Previous Message | Kenneth Marshall | 2019-03-22 12:48:32 | Re: Script which shows performance of ByteA: ascii vs binary |