- In C ``
x left one bit'', an operation that
most machines do very efficiently. The binary number system and
why shifting left is equivalent to multiplication will be
described later in this chapter, and the C programming language
is described in the chapter on programming languages.
register is a small piece of memory large enough to hold a single
- Combining primaries to make
secondary and other colors is very different for additive,
light-based colors than it is for subtractive,
paint-based colors. With
paints, the primaries are red, blue, and yellow. As an example,
combining red and yellow paint in equal proportions creates an
orange paint. To create an orange light, however, one needs to
combine two parts red, one part green, and no blue. X windows
users who are curious to see how RGB primaries are combined
to make their favorite colors can look at the system color
database, usually in a file named
- What constitutes ``massive''
parallelism is not clearly defined. Most authors reserve the term
for systems with 1000 or more individual processors.
- A processor is said to have a ``Harvard
architecture'' if it has two separate memory channels, one for
instructions and one for data.
- Most single-bus
microprocessors use a design known as write-through cache
in which values written to memory are sent simultaneously to
the cache and to the main memory.
- In the Linpak benchmark tables
the theoretical peak performance of the Cray-1S is listed as 160
MFLOPS, probably because it was realistic to keep only two
pipelines chained together for any reasonable period of time