Message 66994 - Python tracker

➜

This issue tracker has been migrated to GitHub , and is currently read-only.
For more information, see the GitHub FAQs in the Python's Developer Guide.

In-reply-to
Author	loewis
Recipients	georg.brandl, loewis, schuppenies
Date	2008年05月17日.13:46:44
SpamBayes Score	0.041469432
Marked as misclassified	No
Message-id	<1211032009.49.0.6289145402.issue2898@psf.upfronthosting.co.za>

Content
It's actually not possible, in general, to compute the memory consumption of an object using basicsize and itemsize. An example is the dictionary, where there is no way to find out how many slots are currently allocated. Even for the things such as lists where the formula basicsize+len*itemsize would be correct it may fail, e.g. a list reports its itemsize as zero, even though each list item consumes four bytes (on a 32-bit system). I don't really see a problem with calling it sizeof, so I would then propose sys.sizeof as the appropriate location.

Content

It's actually not possible, in general, to compute the memory
consumption of an object using basicsize and itemsize. An example is the
dictionary, where there is no way to find out how many slots are
currently allocated.
Even for the things such as lists where the formula
basicsize+len*itemsize would be correct it may fail, e.g. a list reports
its itemsize as zero, even though each list item consumes four bytes (on
a 32-bit system).
I don't really see a problem with calling it sizeof, so I would then
propose sys.sizeof as the appropriate location.

History
Date	User	Action	Args
2008年05月17日 13:46:50	loewis	set	spambayes_score: 0.0414694 -> 0.041469432 recipients: + loewis, georg.brandl, schuppenies
2008年05月17日 13:46:50	loewis	set	spambayes_score: 0.0414694 -> 0.0414694 messageid: <1211032009.49.0.6289145402.issue2898@psf.upfronthosting.co.za>
2008年05月17日 13:46:48	loewis	link	issue2898 messages
2008年05月17日 13:46:46	loewis	create

homepage