Parallel Programming: for Multicore and Cluster Systems- P35 pdf
Parallel Programming: for Multicore and Cluster Systems- P35 pdf
... team. This fork
operation is performed implicitly. The program code inside the parallel construct
is called a parallel region and is executed in parallel by all threads of the team.
The parallel ... sophisticated implementa-
tions may queue command for execution by one of a set of threads. For multicore
processors, several threads are typically available for the execution of...
Parallel Programming: for Multicore and Cluster Systems- P6 pdf
... description of XY routing for two-dimensional meshes and E-cube
routing for hypercubes as typical examples for dimension-order routing algorithms.
XY Routing for Two-Dimensional Meshes
For a two-dimensional ... {n
1
, ,n
k
} exists such that for 1 ≤ i < k each
message N
i
uses a link n
i
for transmission and waits for the release of link n
i+1
which is currently used f...
Parallel Programming: for Multicore and Cluster Systems- P16 pdf
... matrices [127].
The GA approach is provided as a library with interfaces for C, C++, and Fortran
for different parallel platforms. The GA approach is based on a global address space
in which global ... synchronization are performed by the runtime
system, and no low-level lock synchronization must be performed.
Chapel has been developed by Cray Inc. as a new parallel language for...
Parallel Programming: for Multicore and Cluster Systems- P44 pdf
... coefficient matrix A = (a
ij
) ∈ R
n×n
is
symmetric and positive definite, i.e., if a
ij
= a
ji
and x
T
Ax > 0 for all x ∈ R
n
with
x = 0. For a symmetric and positive definite n × n matrix A ∈ R
n×n
there ... Factorization for Sparse Matrices 431
identify its original position in the full matrix. Thus, a compressed storage scheme
for sparse matrices needs the space for the n...
Parallel Programming: for Multicore and Cluster Systems- P10 pdf
... memory accesses must be
atomic and since memory accesses must be performed one after another. There-
fore, processors may have to wait for quite a long time before memory accesses
that they have ... read and write operations which lie in the program before the synchronization
operation are completed before the synchronization operation.
• The synchronization operation is completed befor...
Parallel Programming: for Multicore and Cluster Systems- P12 pdf
... t1 and t2 are temporary array variables.
More information on parallel loops and their execution as well as on transforma-
tions to improve parallel execution can be found in [142, 175]. Parallel ... used for
distributed address space. The fork–join concept is, for example, used in OpenMP
for the creation of threads executing a parallel loop, see Sect. 6.3 for more detail...
Parallel Programming: for Multicore and Cluster Systems- P25 pdf
... communication partners in the form source/dest are given in this
order. For example, for the process with rank=5,itiscoords[1]=1, and there-
fore source=9 (lower neighbor in dimension 0) and dest=1 (upper ... and source for each pro-
cess. These are then used as parameters for MPI
Sendrecv(). The following
diagram illustrates the exchange. For each process, its rank, its Carte...
Parallel Programming: for Multicore and Cluster Systems- P29 pdf
... structure and initializing it with the argument values provided. Moreover,
the threads used for the execution of the tasks are generated and their IDs are stored
in tpl->threads[i] for i=0, ... no
threads waiting for cond. If there are several threads waiting for cond, one of
them is selected to be woken up. For the selection, the priorities of the wait-
ing threads and the...
Parallel Programming: for Multicore and Cluster Systems- P45 pdf
... entries and additional information about the row and column indices to
426 7 Algorithms for Systems of Linear Equations
*
*
*
j
*
*
*
*
*
*
j
j
*
*
*
j
*
*
*
*
*
*
j
data items used for the computation ... an
equality for column
˜
a
j
= (a
1 j
, ,a
nj
) and columns
˜
l
k
= (l
1k
, ,l
nk
)fork ≤ j:
˜
a
j
=
j
k=1
l
jk
˜
l
k
leading to
l
jj
˜
l
j
=
˜
a
j
−
j−1
k=1
l
jk
˜
l
k
(7.6...
Parallel Programming: for Multicore and Cluster Systems- P48 pdf
... 59
Parallel loop, 103
doall loop, 103
dopar loop, 102
forall loop, 102
in OpenMP, 343
Parallel matrix-vector product
column-oriented, 129
row-oriented, 126
Parallel region
in OpenMP, 340
Parallel ... 353
omp
unset nest lock, 353
parallel loop, 343
parallel region, 340, 346
pragma omp atomic, 349
pragma omp barrier, 349
pragma omp critical, 349
pragma omp flush, 351
pragma omp for,...
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