Parallel Programming: for Multicore and Cluster Systems- P2 pot
Parallel Programming: for Multicore and Cluster Systems- P2 pot
... techniques for selecting paths
through networks and switching techniques for message forwarding over a given
path. Section 2.7 considers memory hierarchies of sequential and parallel plat-
forms and ... the resources of parallel platforms and to exchange data and
information between these resources. Interconnection networks also play an impor-
tant role in multicore proces...
Parallel Programming: for Multicore and Cluster Systems- P5 pot
... using edges between nodes for communication, can be re-formulated for G with
the mapping function σ , thus using corresponding edges in G for communication.
The network of a parallel system should ... implies that
there is an edge between node α
0
α
j
α
k−1
and node α
0
¯α
j
α
k−1
for
0 ≤ j ≤ k − 1 where ¯α
j
= 1for
j
= 0 and ¯α
j
= 0for
j
= 1. Thus,
there is an edge betwe...
Parallel Programming: for Multicore and Cluster Systems- P8 pot
... receive
buffer and to select the output channel to be used by inspecting the header informa-
tion of the packet. Thus, for a path of length l, the entire time for packet transmission
with store -and- forward ... path have different
bandwidths as this is typically the case in wide area networks (WANs). In this case,
store -and- forward routing allows the utilization of the full bandwidth...
Parallel Programming: for Multicore and Cluster Systems- P15 pot
... Number of Threads and Sequentialization
Depending on the design and implementation, the runtime of a parallel program
based on threads can be quite different. For the design of a parallel program ... the case for the Pthreads library, see Sect. 6.1.10
for more details. The scheduler of the operating system on the other hand is tuned
for an efficient use of the hardware resource...
Parallel Programming: for Multicore and Cluster Systems- P20 pot
... real parallel machines for a large class of application areas in a satisfactory way.
One of the reasons is that there is a large variety of different architectures for parallel
machines and the ... addition
operations and r multiplication operations are performed.
The time for a single-accumulation operation depends on the specific intercon-
nection network and we consider the...
Parallel Programming: for Multicore and Cluster Systems- P30 pot
... queue and executes the operation (REQ
READ, REQ WRITE,
or REQ
QUIT) specified in the request. For the REQ READ operation, the prompt
specified with the request is output and a line is read in and ... object has to be allocated and initial-
ized before using the attribute object as parameter of pthread
create().An
attribute object for threads has type pthread
attr t. Before an attrib...
Parallel Programming: for Multicore and Cluster Systems- P36 potx
... reduction oper-
ation performed in parallel by the threads of a team. For this kind of calculation
OpenMP provides the reduction clause, which can be used for parallel,
sections, and for constructs. The ... The
second parallel loop performs the matrix multiplication in a nested for loop. The
for construct applies to the first for loop with iteration variable row and, thus,...
Parallel Programming: for Multicore and Cluster Systems- P39 potx
... operations are performed for one entry according to Formula (7.4),
the computation time is
max
q∈P
N
col>k
q
· N
row>k
q
·2t
op
.
In total, the parallel execution for all phases and all steps is
T ... 3t
op
, and
n(n−1)(2n−1)
3p
· t
op
are independent of the
specific choice of p
1
and p
2
and need not be considered. The terms
n(n−1)
2
1
p
1
t
op
and
t
c
p
2
(n − 1) log p...
Parallel Programming: for Multicore and Cluster Systems- P42 potx
... of A and the value
chosen for the relaxation parameter ω. For example the following property holds: If
A is symmetric and positive definite and ω ∈ (0, 2), then the SOR method converges
for every ... for Sparse Systems
The potential parallelism for the Gauss–Seidel iteration or the SOR method is lim-
ited because of data dependences so that a parallel implementation is only r...
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