Paul Davis wrote:
On Fri, Oct 23, 2009 at 1:27 PM, Norman Barker <[email protected]> wrote:
Hi,
is there a way (in Erlang) to open a couchdb document and to iterate
over the document body without having to open up all of the document
in memory?
I would like to use a chunked response to keep the system having a low
memory overhead.
Not a particular couch question, is there a method in erlang to find
the size (as in number of bytes) of a particular term?
many thanks,
Norman
Norman,
Well, for document JSON we store Erlang term binaries on disk so
there's no real way to stream a doc across the wire from disk without
loading the whole thing into RAM. Have you noticed CouchDB having
memory issues on read loads? Its generally pretty light on its memory
requirements for reads.
The only way to get the size of a Term in bytes that I know of is the
brute force: size(term_to_binary(Term)) method.
Paul Davis
Hello,
You can use the erts_debug:size(Term) and erts_debug:flat_size(Term)
functions. They are somewhat
documented here:
http://www.erlang.org/doc/efficiency_guide/processes.html . Note that
the returned
value is in words and not bytes (see erlang:system_info(wordsize). ).
Zoltan.
