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Re: Does network data really cons strings?
From: |
Jesper Harder |
Subject: |
Re: Does network data really cons strings? |
Date: |
Tue, 13 Jan 2004 04:17:18 +0100 |
User-agent: |
Gnus/5.110002 (No Gnus v0.2) Emacs/21.3.50 (gnu/linux) |
Kevin Rodgers <ihs_4664@yahoo.com> writes:
> Jesper Harder wrote:
>
>> I was a bit surprised to see that network data (or any data received
>> from processes) conses Lisp strings.
>>
>> Is it just a quirk of `memory-use-counts' or is it for real? Why
>> does it need to cons Lisp strings if the data is only inserted in a
>> buffer?
>
> So that the data is available to the process filter?
Right, it would need to cons strings if there are filters. But it
also happens when there are no filters.
Hmm, I now notice that it also conses cons cells like mad:
(let (m1 process)
(with-current-buffer (get-buffer-create " *test*")
(erase-buffer))
(setq process (open-network-stream "test" " *test*" "news.gmane.org" 119))
(setq m1 (memory-use-counts))
(process-send-string process "LIST\n")
(sit-for 50)
(process-send-string process "QUIT\n")
(mapcar* '- (memory-use-counts) m1))
=> (48055 3 0 0 509059 2 0 2063)
(with-current-buffer " *test*" (buffer-size))
=> 252123
Roughly two char-cells for every byte of data received! That seems
rather excessive ... and I wonder what all those cons cells are used
for.
Emacs 20.5 seems to do _far_ better for the same data (on a faster
network connection, though):
(4103 0 0 0 4168 0 0)