| NBPERF(1) | General Commands Manual | NBPERF(1) | 
nbperf —
| nbperf | [ -ps] [-aalgorithm] [-cutilisation] [-hhash] [-iiterations] [-mmap-file] [-nname] [-ooutput] [input] | 
nbperf reads a number of keys one per line from standard
  input or input. It computes a minimal perfect hash
  function and writes it to stdout or output. The default
  algorithm is “chm”.
The -m argument instructs
    nbperf to write the resulting key mapping to
    map-file. Each line gives the result of the hash
    function for the corresponding input key.
The parameter utilisation determines the space efficiency.
Supported arguments for -a:
Supported arguments for -h:
The number of iterations can be limited with
    -i. nbperf outputs a
    function matching uint32_t
    hash(const void * restrict,
    size_t) to stdout. The function expects the key length
    as second argument, for strings not including the terminating NUL. It is the
    responsibility of the caller to pass in only valid keys or compare the
    resulting index to the key. The function name can be changed using
    -n name. If the
    -s flag is specified, it will be static.
After each failing iteration, a dot is written to stderr.
nbperf checks for duplicate keys on the
    first iteration that passed basic hash distribution tests. In that case, an
    error message is printed and the program terminates.
If the -p flag is specified, the hash
    function is seeded in a stable way. This may take longer than the normal
    random seed, but ensures that the output is the same for repeated
    invocations as long as the input is constant.
nbperf utility exits 0 on success,
  and >0 if an error occurs.
| September 25, 2012 | NetBSD 9.4 |