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CentOS 7.0 - man page for ocamlrun (centos section 1)

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OCAMLRUN(1)									      OCAMLRUN(1)

       ocamlrun - The OCaml bytecode interpreter

       ocamlrun [ options ] filename argument ...

       The  ocamlrun(1)  command  executes  bytecode  files  produced by the linking phase of the
       ocamlc(1) command.

       The first non-option argument is taken to be the name of  the  file  containing	the  exe-
       cutable	bytecode. (That file is searched in the executable path as well as in the current
       directory.) The remaining arguments are passed to the OCaml program, in the  string  array
       Sys.argv.  Element 0 of this array is the name of the bytecode executable file; elements 1
       to n are the remaining arguments.

       In most cases, the bytecode executable files produced by the ocamlc(1) command  are  self-
       executable, and manage to launch the ocamlrun(1) command on themselves automatically.

       The following command-line options are recognized by ocamlrun(1).

       -b     When the program aborts due to an uncaught exception, print a detailed "back trace"
	      of the execution, showing where the exception was raised and which  function  calls
	      were  outstanding  at  this  point.  The back trace is printed only if the bytecode
	      executable contains debugging information, i.e. was compiled and linked with the -g
	      option  to  ocamlc(1)  set.  This option is equivalent to setting the b flag in the
	      OCAMLRUNPARAM environment variable (see below).

       -I dir Search the directory dir for dynamically-loaded libraries, in addition to the stan-
	      dard search path.

       -p     Print the names of the primitives known to this version of ocamlrun(1) and exit.

       -v     Direct  the  memory  manager  to print verbose messages on standard error.  This is
	      equivalent to setting v=63 in the OCAMLRUNPARAM environment variable (see below).

	      Print version string and exit.

       -vnum  Print short version number and exit.

       The following environment variable are also consulted:

	      Additional directories to search for dynamically-loaded libraries.

	      The directory containing the OCaml standard library.  (If OCAMLLIB is not set, CAM-
	      LLIB  will  be  used  instead.)  Used  to locate the ld.conf configuration file for
	      dynamic loading.	If not set, default to the library directory specified when  com-
	      piling OCaml.

	      Set  the	runtime  system options and garbage collection parameters.  (If OCAMLRUN-
	      PARAM is not set, CAMLRUNPARAM will be used instead.)   This  variable  must  be	a
	      sequence	of parameter specifications.  A parameter specification is an option let-
	      ter followed by an = sign, a decimal number (or a hexadecimal  number  prefixed  by
	      0x),  and  an optional multiplier.  There are nine options, six of which correspond
	      to the fields of the control record documented in The OCaml user's manual,  chapter
	      "Standard Library", section "Gc".

       b      Trigger  the  printing  of  a stack backtrace when an uncaught exception aborts the
	      program.	This option takes no argument.

       p      Turn on debugging support for ocamlyacc-generated parsers.  When this option is on,
	      the  pushdown  automaton	that  executes the parsers prints a trace of its actions.
	      This option takes no argument.

       a (allocation_policy)
	      The policy used for allocating in the OCaml heap.  Possible values are  0  for  the
	      next-fit	policy, and 1 for the first-fit policy.  Next-fit is somewhat faster, but
	      first-fit is better for avoiding fragmentation and the associated heap compactions.

       s (minor_heap_size)
	      The size of the minor heap (in words).

       i (major_heap_increment)
	      The default size increment for the major heap (in words).

       o (space_overhead)
	      The major GC speed setting.

       O (max_overhead)
	      The heap compaction trigger setting.

       l (stack_limit)
	      The limit (in words) of the stack size.

       h      The initial size of the major heap (in words).

       v (verbose)
	      What GC messages to print to stderr.  This is a sum of  values  selected	from  the

	      0x001 Start of major GC cycle.

	      0x002 Minor collection and major GC slice.

	      0x004 Growing and shrinking of the heap.

	      0x008 Resizing of stacks and memory manager tables.

	      0x010 Heap compaction.

	      0x020 Change of GC parameters.

	      0x040 Computation of major GC slice size.

	      0x080 Calling of finalisation functions.

	      0x100  Startup  messages	(loading  the  bytecode executable file, resolving shared

	      The multiplier is k, M or G, for multiplication by 2^10,	2^20,  and  2^30  respec-
	      tively.	For example, on a 32-bit machine under bash, the command export OCAMLRUN-
	      PARAM='s=256k,v=1' tells a subsequent ocamlrun to set its initial minor  heap  size
	      to 1 megabyte and to print a message at the start of each major GC cycle.

	      If  OCAMLRUNPARAM  is  not found in the environment, then CAMLRUNPARAM will be used
	      instead.	If CAMLRUNPARAM is not found, then the default values will be used.

       PATH   List of directories searched to find the bytecode executable file.

       The OCaml user's manual, chapter "Runtime system".

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