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CRTL, Feature Logical Names, DECC$PIPE_BUFFER_SIZE
 *Conan The Librarian 

    The system default buffer size of 512 bytes for pipe write
    operations can limit performance and generate extra line feeds
    when handling messages longer than 512 bytes.

    DECC$PIPE_BUFFER_SIZE allows a larger buffer size to be used for
    pipe functions such as pipe and popen. A value of 512 to 65535
    bytes can be specified.

    If DECC$PIPE_BUFFER_SIZE is not specified, the default buffer
    size 512 is used.

    Default: 512

    Minimum: 512

    Maximum: 65535
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