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Descriptions of options used by HP for CPU2000:
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+A		Cause the linker ld(1) to use only archive libraries
		for all occurrences of the -l option.  Also inform the
		C++ run-time environment that no shared libraries will
		be used by the program.

-Ae		Enable ANSI compatibility mode with UNIX extensions.

+cat		Concatenate input source files.

-D		Set definition for preprocessor.

+DA<arch>	Generate code for the architecture specified.

+DS<arch>	Schedule code for the architecture specified.

+ESfic		Replace millicode calls with in-line code for 
		for indirect calls.

+ESlit		Put literals in read-only text space.

fastmem.o	Replacement for malloc/free that assumes ANSI compliant code.

+I/+P		Optimize/Instrument for profile based optimization.

-K		Use static storage for locals instead of stack storage. Same
		functionality as the +save option.  The default is +nosave.

Kernel Tunables (Listed separately)

+O1		Perform optimizations within basic blocks only.

+O2		Perform +O1 optimizations.  In addition perform global
		optimizations at the procedure level.  (Same as -O.)

+O3		Perform +O2 optimizations as well as interprocedural global
		optimizations within a file (including inlining).

+O4		Perform +O3 optimizations.  Also apply interprocedural
		optimizations across all files of the program.

+Oaggressive	Apply aggressive optimizations which include scheduling on
		procedure entry and exit code, replacing standard library
		calls with inlined code sequences, no auto-initialization
		of uninitialized local scalar non-static variables, and
		scheduling beyond basic block boundaries.

+Oall		Apply all optimizations that would be enabled by specifying
		+O4, +Oaggressive, and +Onolimit on the same command line.
		Detailed options countermanding components of +Oall override
		that component.

+Ocachepadcommon
		Pad common blocks to avoid cache collisions.

+Odataprefetch	Generate data prefetch instructions for data structures
		referenced within innermost loops.

+Oentrysched	Perform instruction scheduling on a subprogram's entry and
		exit sequences.

+O[no]fastaccess
		Enable [disable] fast access to global data items.

+fastallocatable
		Enables a different representation for allocatable
		arrays in the object code produced by the
		compiler.  This alternate representation avoids
		problems in optimizing code containing allocatable
		array references.  This alternate representation
		for allocatable arrays is binary compatible with
		the old representation.

+O[no]fltacc	Disable [enable] optimizations that cause imprecise
		floating-point results.

+Oinlinebudget=n
                The +Oinlinebudget option controls the
                aggressiveness of inlining.  n is an integer in
                the range 1 - 1000000 that specifies the level
                of aggressiveness as follows:
                                  n         Meaning
                                  = 100     Default level on inlining.
                                  > 100     More aggressive inlining.
                                  2 - 99    Less aggressive inlining.
                                  = 1       Only inline if it reduces code
                                            size.
                 This optimization can occur at optimization
                 levels 3, and 4.  The default is +Oinlinebudget=100.

+O[no]libcalls	Invoke [do not invoke] low call-overhead versions of
		select library routines.

+O[no]limit     Suppress [do not suppress] optimizations that
                significantly increase compile-time or consume
                enormous amounts of memory.  These optimizations
                can occur at levels 2, 3, and 4.  The default is +Olimit.

+O[no]loop_block
		Enable [disable] loopblocking for data cache optimizations.
		Available at optimization level 3 and above.

+O[no]loop_unroll
		Enable [disable] loop unrolling.

+Omultiprocessor
		Prevent instruction cache prefetching following subroutine 
		returns.  This can benefit some multithreaded applications.

+noeh		Disable exception handling.  Note that mixing objects
		compiled both with and without +noeh can have undesired
		results.  Object destruction, for example, will not be
		done for objects local to functions compiled with the
		+noeh option.

+O[no]promote_indirect_calls
		Enable [disable] the promotion of indirect calls
		to direct calls.  (Indirect calls occur with
		pointers to functions (and virtual calls for
		C++).) This option can be used at optimization
		levels 3 and 4.  The default is
		+Onopromote_indirect_calls.

+Optrs_strongly_typed 
		Assume that all pointers are type safe.

+O[no]ptrs_to_globals
		Optimize with assumption that global variables
		may [may not] be modified through pointers.

+Oregionsched	Perform scheduling across branches.

+Ostaticprediction
		Enable static branch prediction.

+O[no]vectorize	Replace eligible loops with calls to the vector library.

+Owhole_program_mode
		Hold global variables in registers longer and delete
		inlined or cloned global procedures.

-Wl,+FPD	Enable sudden underflow (flush to zero) of denormalized 
		values.

-Wl,-a,archive	Link with archive format libraries rather than shared.

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Descriptions of Kernel Tunables 
-------------------------------

dbc_max_pct     Maximum dynamic buffer cache size as a percent of system memory

dbc_min_pct     Minimum dynamic buffer cache size as a percent of system memory

vps_ceiling     Maximum System-Selected Page Size (in Kbytes)

vps_pagesize    Default user page size (in Kbytes)