[Dev-luatex] Memory leak in string.explode()?

Hans Hagen pragma at wxs.nl
Wed Nov 7 11:07:14 CET 2012


On 11/7/2012 10:33 AM, luigi scarso wrote:
>
>
> On Wed, Nov 7, 2012 at 10:07 AM, Hans Hagen <pragma at wxs.nl
> <mailto:pragma at wxs.nl>> wrote:
>
>     On 11/7/2012 1:50 AM, Reinhard Kotucha wrote:
>
>         What I don't grok is why it's 20 times slower to load a file at once
>         than in little chunks.  But what I'm mostly concerned about is
>         memory
>         consumption.  In xosview I can see that the garbage collector
>         reduces
>         the consumed memory from time to time, but it doesn't seem to be
>         overly hungry.  Even worse, I have the impression that memory
>         consumption grows exponentially with time.  With a slightly larger
>         test file my system (4GB RAM) would certainly run out of memory.
>
>
>     I think 20 times is somewhat off at your end because here I get this:
>
> Out of memory here  with a testfile of  662M
> Linux 32bit, 4GByte, PAE extension
>
> # time ./read_blocks.lua
>
> real    0m2.458s
> user    0m0.372s
> sys    0m1.084s
> # time ./read_whole_file.lua
> not enough memory
>
> real    0m17.125s
> user    0m11.737s
> sys    0m4.292s
>
> # texlua -v
> This is LuaTeX, Version beta-0.70.1-2012052416 (rev 4277)

Indeed not enough mem on my laptop for a 600M+ test.

Windows 8, 32 bit:

-- all      1.082   34176584    120272.328125
-- chunked  0.668   34176584    169908.59667969
-- once     1.065   34176584    111757.03710938

-- all      7.078   136706337   535063.34863281
-- chunked  3.441   136706337   787195.56933594
-- once     6.621   136706337   501559.83691406

the larger values for 'all' and 'once' still puzzle me.

Hans

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