Обсуждение: Varlena and binary

Hi,

I'm sending small patch for textsend. It reduces unnecessary copies, and
memory usage for duplication of varlena data. May you look?

Kind regards,
Radosław Smogura

Radosław Smogura <mail@smogura.eu> writes:
> I'm sending small patch for textsend. It reduces unnecessary copies, and 
> memory usage for duplication of varlena data. May you look?

This code will break the day that text and bytea don't have the same
internal representation, which seems likely to be soon.  Barring some
compelling evidence of a major performance improvement obtainable this
way, I don't think we want this patch.
        regards, tom lane

Just from curious may I ask in which direction this will go, and how this will 
affect performance of text and binary format?

Actually I started to make smaller improvements, and I think about one big to 
encode text (when client and server encoding are different) directly to 
StringInfo, without intermediate buffer.

Thanks in advice
Radek

Tom Lane <tgl@sss.pgh.pa.us> Monday 07 February 2011 17:12:07
> Radosław Smogura <mail@smogura.eu> writes:
> > I'm sending small patch for textsend. It reduces unnecessary copies, and
> > memory usage for duplication of varlena data. May you look?
> 
> This code will break the day that text and bytea don't have the same
> internal representation, which seems likely to be soon.  Barring some
> compelling evidence of a major performance improvement obtainable this
> way, I don't think we want this patch.
> 
>             regards, tom lane

On Mon, Feb 7, 2011 at 11:12 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Radosław Smogura <mail@smogura.eu> writes:
>> I'm sending small patch for textsend. It reduces unnecessary copies, and
>> memory usage for duplication of varlena data. May you look?
>
> This code will break the day that text and bytea don't have the same
> internal representation, which seems likely to be soon.

Oh, really?

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company