A few additional details. According to Linux Programmer's Manual
1. http://man7.org/linux/man-pages/man3/mallopt.3.html
2. http://man7.org/linux/man-pages/man3/malloc_trim.3.html
And if I understood everything correctly `free` could trigger `malloc_trim`
based on value of several environment variables - MALLOC_TOP_PAD_ and
MALLOC_TRIM_THRESHOLD_. However setting them as low as 1 or 0 doesn't have
any effect (but as I wrote in previous email manual call of `malloc_trim`
helps to release memory).
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