Bugfix multimap size#6

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NavyaZaveri wants to merge 2 commits intowspeirs:masterfrom

NavyaZaveri:bugfix_multimap_size

Commits on May 21, 2020

Use sample_iter() to generate distrbution instead of deprecated gen_ascii_chars
NavyaZaveri
committed

Commits on May 22, 2020

fix bug in determining size of mmap
NavyaZaveri
committed