The –concurrentize option allows Power Fortran to convert eligible loops to run in parallel throughout the source file, subject to use of directives within the source file (see “C*$* NOCONCURRENTIZE”).

The -noconcurrentize option disables conversion of eligible loops throughout the source file, subject to the use of the directives within the source file (see “C*$* CONCURRENTIZE”).

The option -directives=list enables interpretation of directives in the source file. The letters in list specify different classes of directives to be recognized:

The default is to enable all but Cray directives, since there are cases where the Cray CDIR$ IVDEP directive is unsafe in SGI Fortran (see “CDIR$ IVDEP”).

The options -nodirectives disables processing of all directives in the source file.

The –limit=n option reduces Power Fortran processing time by limiting the amount of time Power Fortran can spend trying to determine whether a loop is safe to run in parallel. Power Fortran estimates how much time is required to analyze each loop nest construct. If an outer loop looks like it would take too much time to analyze, Power Fortran ignores the outer loop and recursively visits the inner loops.

Larger limits often allow Power Fortran to generate parallel code for deeply nested loop structures that it might not otherwise be able to run safely in parallel. However, with larger limits Power Fortran can also take more time to analyze a program.The value of n does not correspond to the loop nest level. It is an estimate of the number of loop orderings that Power Fortran can generate from a loop nest.

The same processing limit can be specified within the source file using a directive; see “C*$* LIMIT”.

The –lines option sets the page size for the listing produced by Power Fortran. Specifying –lines=0 paginates at subroutine boundaries only.

The –listoptions=list option specifies the information to include in the listing file (.L). The letters in list include any combination of the letters in Table C-2. The default is –listoptions=ol.

The –minconcurrent=n option establishes the minimum amount of work needed inside a loop to make executing a loop in parallel worthwhile. If the loop does not contain at least this much work, the loop will not be run in parallel.

When the loop bounds are constants, Power Fortran can decide whether or not to transform the loop at compile time. If the loop bounds are not constants, Power Fortran transforms the loop to parallel form but includes an IF clause in the parallelizing directive to test at run time whether sufficient work exists.

The value n is a count of the number of operations (for example, add, multiply, load, store) in the loop, multiplied by the number of times the loop will be executed.

The –optimize=n option sets the optimization level. The higher you set the optimization level, the more code is optimized and the longer compilation takes Valid values for n are:

The –parallelio option enables the parallelization of loops that contain I/O statements. Use this option only on systems with parallel I/O capabilities or where I/O statements in loops are not executed.

The -noparallelio option (the default) disables transformation of any loop with an I/O statement in it.

The –suppress option lets you disable individual classes of Power Fortran messages that are normally included in the listing (.L) file These messages range from syntax warnings and error messages to messages about the optimizations performed. list is any combination of the option letters summarized in Table C-3.