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HP Integrity Servers: HP aC++/HP ANSI C Release Notes > Chapter 3 Installation Information

Hardware Requirements

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	IMPORTANT: Compiling files at optimization level 2 (-O or +O2) and above increases the amount of virtual memory needed by the compiler. In cases where very large functions or files are compiled at +O2, or in cases where aggressive (+O3 and above) optimization is used, ensure that the `maxdsiz` kernel tunable is set appropriately on the machine where compilation takes place. HP recommends a setting of 0x100000000, or 4 GB (the default for this parameter is 0x100000000, or 4 GB) for "maxdsiz_64bit" in such cases. Updating the "`maxdsiz_64bit`" tunable will ensure that the compiler does not run out of virtual memory when compiling large files or functions. In addition, "`maxssiz_64bit`" should be set to 128 MB for very large or complex input files. (Normally a "`maxssiz_64bit`" setting of 64 MB will be sufficient.) HP recommends not reducing the maxfiles setting below the default value of 2048. See the kctune man page for more information on how to change kernel tunable parameters.

HP aC++ requires approximately 115 MB for the files in

/opt/aCC

The other components require approximately:

32 MB for WDB
90 MB for u2comp/be
90 MB for HP Caliper
160 MB for HP Code Advisor

For more precise sizes, use the command:

/usr/sbin/swlist -a size B9007AA

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