On Fri, Jul 13, 2018 at 5:03 AM André Malo <n...@perlig.de> wrote: > > * INADA Naoki wrote: > > > Is there any real application which marshal.dumps() performance is > > critical? > > I'm using it for spooling big chunks of data on disk, exactly for the reason > that it's faster than pickle. > > Cheers,
Does your data contains repetition of same object (not same value)? If yes, this change will affects you. If no, you can use older version which doesn't have overhead of checking object identity. >>> x = [0]*100 >>> y = [0]*100 >>> data = [x,y,x] >>> import marshal >>> len(marshal.dumps(data)) # x is marshaled once 1020 >>> d[0] is d[2] True >>> d[0] is d[1] False >>> import json >>> len(json.dumps(data)) # x is marshaled twice 906 >>> d = marshal.loads(marshal.dumps(data, 2)) # x is marshaled twice >>> len(d) 1520 >>> d[0] is d[2] False -- INADA Naoki <songofaca...@gmail.com> _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
