2.6.2 Environment Variables for bchscheme

These environment variables are referred to by bchscheme (not by scheme).

MITSCHEME_GC_DIRECTORY

The directory in which GC files are written. Overridden by --gc-directory. The default for this variable is the standard temporary directory (see TMPDIR in see Runtime Environment Variables).

MITSCHEME_GC_FILE (default: GCXXXXXX)

The name of the file to use for garbage collection. If it ends in 6 ‘X’s, the ‘X’s are replaced by a letter and process id of the scheme process, thus generating a unique name. Overridden by --gc-file.

MITSCHEME_GC_START_POSITION (default: ‘0’)

The first position in the GC file to use. Overridden by --gc-start-position.

MITSCHEME_GC_END_POSITION (default: start-position+heap-size)

The last position in the GC file to use. Overridden by --gc-end-position.

MITSCHEME_GC_WINDOW_SIZE (default: ‘16’)

The size in blocks of windows into new space (in the GC file). Overridden by --gc-window-size.

The following environment variables are only used by an experimental version of Bchscheme that uses unix System V-style shared memory, and then only if the gcdrone program is installed:

MITSCHEME_GC_DRONE (default: gcdrone)

The program to use as the I/O drone during garbage collection. Overridden by --gc-drone.

MITSCHEME_GC_READ_OVERLAP (default: ‘0’)

The maximum number of simultaneous read operations. Overridden by --gc-read-overlap.

MITSCHEME_GC_WRITE_OVERLAP (default: ‘0’)

The maximum number of simultaneous write operations. Overridden by --gc-write-overlap.