[Octave-bug-tracker] [bug #65669] Cell array construction is memory-intensive

[Dmitri A. Sergatskov]

Follow-up Comment #32, bug #65669 (group octave):

It may be not as much as the actual value, but the fact that
MALLOC_TRIM_THRESHOLD_ is set (it prevents dynamic threshhold escalation).
>From "man mallopt):


Note: Nowadays, glibc uses a dynamic mmap threshold by
              default.  The initial value of the threshold is 128*1024,
              but when blocks larger than the current threshold and less
              than or equal to DEFAULT_MMAP_THRESHOLD_MAX are freed, the
              threshold is adjusted upward to the size of the freed
              block.  When dynamic mmap thresholding is in effect, the
              threshold for trimming the heap is also dynamically
              adjusted to be twice the dynamic mmap threshold.  Dynamic
              adjustment of the mmap threshold is disabled if any of the
              M_TRIM_THRESHOLD, M_TOP_PAD, M_MMAP_THRESHOLD, or
              M_MMAP_MAX parameters is set.



Dmitri.
-- 



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