| slovo | definícia |
parallelism
(encz) | parallelism,podobnost n: Martin Král |
parallelism
(encz) | parallelism,rovnoběžnost n: Martin Král |
parallelism
(encz) | parallelism,souběžnost n: Martin Král |
Parallelism
(gcide) | Parallelism \Par"al*lel*ism\, n. [Gr. ?, fr. ? to place side by
side, or parallel: cf. F. parall['e]lisme.]
[1913 Webster]
1. The quality or state of being parallel.
[1913 Webster]
2. Resemblance; correspondence; similarity.
[1913 Webster]
A close parallelism of thought and incident. --T.
Warton.
[1913 Webster]
3. Similarity of construction or meaning of clauses placed
side by side, especially clauses expressing the same
sentiment with slight modifications, as is common in
Hebrew poetry; e. g.:
At her feet he bowed, he fell:
Where he bowed, there he fell down dead. --Judg. v.
27.
[1913 Webster] |
parallelism
(wn) | parallelism
n 1: similarity by virtue of corresponding [syn: parallelism,
correspondence] |
parallelism
(foldoc) | parallelism
1. parallel processing.
2. The maximum number of independent subtasks in a
given task at a given point in its execution. E.g. in
computing the expression
(a + b) *
(c + d) the expressions a, b, c and d can all be calculated in
parallel giving a degree of parallelism of (at least) four.
Once they have been evaluated then the expressions a + b and c
+ d can be calculated as two independent parallel processes.
The Bernstein condition states that processes P and Q can be
executed in parallel (or in either sequential order) only if:
(i) there is no overlap between the inputs of P and the
outputs of Q and vice versa and
(ii) there is no overlap between the outputs of P, the outputs
of Q and the inputs of any other task.
If process P outputs value v which process Q reads then P must
be executed before Q. If both processes write to some
variable then its final value will depend on their execution
order so they cannot be executed in parallel if any other
process depends on that variable's value.
(1995-05-07)
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| | podobné slovo | definícia |
Parallelism
(gcide) | Parallelism \Par"al*lel*ism\, n. [Gr. ?, fr. ? to place side by
side, or parallel: cf. F. parall['e]lisme.]
[1913 Webster]
1. The quality or state of being parallel.
[1913 Webster]
2. Resemblance; correspondence; similarity.
[1913 Webster]
A close parallelism of thought and incident. --T.
Warton.
[1913 Webster]
3. Similarity of construction or meaning of clauses placed
side by side, especially clauses expressing the same
sentiment with slight modifications, as is common in
Hebrew poetry; e. g.:
At her feet he bowed, he fell:
Where he bowed, there he fell down dead. --Judg. v.
27.
[1913 Webster] |
explicit parallelism
(foldoc) | explicit parallelism
A feature of a programming language for a {parallel
processing} system which allows or forces the programmer to
annotate his program to indicate which parts should be
executed as independent parallel tasks. This is obviously
more work for the programmer than a system with {implicit
parallelism} (where the system decides automatically which
parts to run in parallel) but may allow higher performance.
|
implicit parallelism
(foldoc) | implicit parallelism
A feature of a programming language for a {parallel
processing} system which decides automatically which parts to
run in parallel.
The best way of providing implicit parallelism is still (1995)
an active research topic. The problem is to generate the
right number of parallel tasks of the right size (or
"granularity"). Too many tasks and the system gets bogged
down in house-keeping, or memory for waiting tasks runs out,
too few tasks and processors are left idle.
The best performance is usually achieved with {explicit
parallelism} where the programmer can annotate his program to
indicate which parts should be executed as independent
parallel tasks.
(1995-02-16)
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