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$ time ./llil4map long* long* long* | cksum
llil4map start
...
       real time     0m43.973s   0m27.461s
       user         25m08.532s  20m02.479s
       sys           0m55.602s   0m43.250s

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$ time ./llil4vec long* long* long* | cksum
llil4vec start
...
       real time     3m57.228s   3m38.118s   1m50.092s
       user         73m27.931s  70m13.776s  45m32.094s
       sys           2m42.941s   2m29.584s   2m20.917s

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#pragma omp parallel for schedule(static, 1) reduction(+:num_lines)
for (int i = 0; i < nfiles; ++i) {
...
         propvec.emplace_back(std::move(*it));
   }
}

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// Reduce a vector range (tally adjacent count fields of duplicate key
+ names)
static void reduce_vec(auto& vec)  
...
      vec.resize(std::distance(it1, ++itw));
   }
}

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string_cnt.h   - original + key length stored with count
string_cnt_f.h - fixed-length-only version
string_cnt_u.h - union std::array

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   // Free dynamically allocated memory in parallel.
#ifndef FIXED_LENGTH_ONLY
...
   for (size_t i = 0; i < propvec.size(); i++)
      propvec[i].free();
#endif