Message 199457 - Python tracker

Message199457

Author	pitrou
Recipients	barry, christian.heimes, kristjan.jonsson, pitrou, vstinner
Date	2013-10-11.09:56:06
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<691672221.68628960.1381485360180.JavaMail.root@zimbra10-e2.priv.proxad.net>
In-reply-to	<1882276521.68616056.1381485110088.JavaMail.root@zimbra10-e2.priv.proxad.net>

Content
> > Reading the code, I see we now maintain a small internal buffer in > > the file object, rather than using stack allocation at the call > > sites. It is unclear to me how this saves memory, since the amount > > of memory copying should be the same. > > No, memory copying is suppressed in many cases. To clarify: the import logic uses marshal.loads(), not marshal.load(). So the aim is really to speed up unmarshalling from memory.

Content

> > Reading the code, I see we now maintain a small internal buffer in
> > the file object, rather than using stack allocation at the call
> > sites.  It is unclear to me how this saves memory, since the amount
> > of memory copying should be the same.
> 
> No, memory copying is suppressed in many cases.

To clarify: the import logic uses marshal.loads(), not marshal.load().
So the aim is really to speed up unmarshalling from memory.

History
Date	User	Action	Args
2013-10-11 09:56:07	pitrou	set	recipients: + pitrou, barry, kristjan.jonsson, vstinner, christian.heimes
2013-10-11 09:56:07	pitrou	link	issue19219 messages
2013-10-11 09:56:07	pitrou	create