On 1/28/2014 10:02 PM, Kristján Valur Jónsson wrote:
marshall is not guaranteed to be backward compatible between Python
versions, so it's generally not a good idea to use it for serialization.
How often I hear this argument :)
For many people, serialized data is not persisted. But used e.g.
python.org] On Behalf Of Barry Warsaw
> Sent: Tuesday, January 28, 2014 17:23
> To: python-dev@python.org
> Subject: Re: [Python-Dev] Python 3.4, marshal dumps slower (version 3
> protocol)
> marshall is not guaranteed to be backward compatible between Python
> versions, so it
n-Dev] Python 3.4, marshal dumps slower (version 3 protocol)
Hi,
I tested the latest beta from 3.4 (b3) and noticed there is a new marshal
protocol version 3.
The documentation is a little silent about the new features, not going into
detail.
I've run a performance test with the new pr
On 28.01.2014 10:23, Barry Warsaw wrote:
On Jan 28, 2014, at 09:17 AM, tds...@gmail.com wrote:
yes I know the main usage is to generate pyc files. But marshal is also used
for other stuff and is the fastest built in serialization method. For some
use cases it makes sense to use it instead of pi
On Tue, 28 Jan 2014 11:22:40 +0100
Victor Stinner wrote:
> 2014-01-28 "Martin v. Löwis" :
> > Debugging reveals that it is actually the many integer objects which
> > trigger the sharing code. So a much simplified example of Victor's
> > benchmarking code can use
> >
> > data = [0]*1000
> >
>
2014-01-28 "Martin v. Löwis" :
> Debugging reveals that it is actually the many integer objects which
> trigger the sharing code. So a much simplified example of Victor's
> benchmarking code can use
>
> data = [0]*1000
>
> The difference between version 2 and version 3 here is that v2 marshals
On Jan 28, 2014, at 09:17 AM, tds...@gmail.com wrote:
>yes I know the main usage is to generate pyc files. But marshal is also used
>for other stuff and is the fastest built in serialization method. For some
>use cases it makes sense to use it instead of pickle or others. And people
>use it not on
I've debugged this a little bit. I couldn't originally see where the
problem is, since I expected that the code dealing with shared
references shouldn't ever trigger - none of the tuples in the example
are actually shared (i.e. they all have a ref-count of 1, except for
the outer list, which is bot
n-dev-
bounces+kristjan=ccpgames@python.org] On Behalf Of Victor Stinner
Sent: Monday, January 27, 2014 23:35
To: Wolfgang
Cc: Python-Dev
Subject: Re: [Python-Dev] Python 3.4, marshal dumps slower (version 3
protocol)
Hi,
I'm surprised: marshal.dumps() doesn't raise an error if you
Of Victor Stinner
> Sent: Monday, January 27, 2014 23:35
> To: Wolfgang
> Cc: Python-Dev
> Subject: Re: [Python-Dev] Python 3.4, marshal dumps slower (version 3
> protocol)
>
> Hi,
>
> I'm surprised: marshal.dumps() doesn't raise an error if you pass an invali
27.01.14 17:35, Victor Stinner написав(ла):
Python 3.4 has two new versions: 3 and 4. The version 3 "shares common
object references", the version 4 adds short tuples and short strings
(produce smaller files).
Why we need two new versions added in one Python release?
_
Thanks Victor for improving this.
I also have to note, version 3 is only in the case of tuple in tuple
slower. If you use a flat tuple it is faster than version 2.
So I asked for this corner case and thought the recursion detection or
something else has a huge cost.
For pyc files, I think the hig
On Mon, Jan 27, 2014 at 10:42 AM, Paul Moore wrote:
> On 27 January 2014 15:35, Victor Stinner wrote:
> > Version 2 is the fastest in Python 3.3 and 3.4, but version 4 with
> > Python 3.4 produces the smallest file.
>
> Which version is used when creating pyc files? This benchmark might
> sugges
On 27 January 2014 15:35, Victor Stinner wrote:
> Version 2 is the fastest in Python 3.3 and 3.4, but version 4 with
> Python 3.4 produces the smallest file.
Which version is used when creating pyc files? This benchmark might
suggest that version 2 is the best...
Paul
___
Hi,
I'm surprised: marshal.dumps() doesn't raise an error if you pass an
invalid version. In fact, Python 3.3 only supports versions 0, 1 and
2. If you pass 3, it will use the version 2. (Same apply for version
99.)
Python 3.4 has two new versions: 3 and 4. The version 3 "shares common
object ref
Hi,
I tested the latest beta from 3.4 (b3) and noticed there is a new marshal
protocol version 3.
The documentation is a little silent about the new features, not going into
detail.
I've run a performance test with the new protocol version and noticed the
new version is two times slower in serial
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