[Ecls-list] Memory problems during IO

[Juan Jose Garcia-Ripoll]

On Tue, Dec 1, 2009 at 4:59 AM, Waldek Hebisch <hebisch at math.uni.wroc.pl>wrote:

> The file has 122 MB, I compiled ECL without Unicode support, so
> the strings should take similare space in memory as in a file.
> So why there is so much consing?  For comparison sbcl needs
> 5.216 sec but conses only 13,360,144 bytes.  And for reading
> sbcl is much faster, 2.559 sec and 492,137,056 bytes consed
> (note that sbcl uses unicode strings, so the amount consed
> is essentially the same as space needed to store strings).


ECL uses some buffers and maybe they are not as large as you need. When
reading a string one reads until the buffer is full and then must adjust the
size of the string dynamically. The strategy for doing that may condition
how much memory is consed. And your file is not only large: it contains
rather large strings (20000 characters) when compared to normal use.

Juanjo


-- 
Instituto de Física Fundamental, CSIC
c/ Serrano, 113b, Madrid 28006 (Spain)
http://juanjose.garciaripoll.googlepages.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.common-lisp.net/pipermail/ecl-devel/attachments/20091201/aa2f10cb/attachment.html>