Unanswered Questions
312 questions with no upvoted or accepted answers
20
votes
0
answers
260
views
Status of all Evaluators?
Since I have 4 cores on my machine I typically have 4 notebooks open each with their own kernel evaluator. I'd like to construct a dynamic pane similar to the parallel kernels status window:
But that ...
- 31.9k
17
votes
0
answers
711
views
Mathematica HPC on AWS vs. Azure
I am looking for advice on deploying Mathematica for HPC in an on-demand cloud environment. I occasionally have Mathematica projects that require parallel computing and large amounts of RAM. These ...
- 239k
17
votes
0
answers
5k
views
Threads vs Cores: How many kernels need to launch in parallel Mathematica?
I have a dual-core intel machine. I would like to test how many parallel local kernels should be launch to get the optimized performance. Knowing that the HyperThreading technology of Intel could run ...
- 1,811
13
votes
0
answers
2k
views
ParallelTable kernels die - maybe Mathlink timeout?
I am new to parallel computing in Mathematica. I am using
LaunchKernels[16]
ParallelTable[]
to parallelize calculations. The ParallelTable consists of approx ...
- 66.4k
12
votes
0
answers
292
views
How to parallelize Reap and Sow in Mathematica 14.0.0?
I'm working with a huge amount of data, so I'm avoiding using AppendTo. I used to use the Reap and ...
- 71.6k
10
votes
0
answers
693
views
WolframScript never exits (v11 only)
after updating to version 11, I came across a problem with the execution of package files via bash.
The WolframScript program runs the entire code, but frequently it does not exit properly and as a ...
- 181
8
votes
0
answers
583
views
How to force the compilation language to be C++ (not C) in CreateExecutable or CreateLibrary
I'm trying to speed up a section of a Mathematica 9.0.1 notebook by performing some calculations in C++ with the Cilk Plus and Threading Building Blocks tools available for the Intel C++ 14.0 compiler ...
- 7,272
7
votes
0
answers
236
views
Are all MMA computations single-core unless explicitly parallelized?
I was wondering if the WolframMark Benchmark uses more than one core. This becomes relevant when comparing Benchmark scores between, say, 4-core and 8-core machines.
I looked at Benchmark's code, and ...
- 3,693
7
votes
0
answers
189
views
How to do parallel computation when using LinearProgramming function?
I have a LP problem which contains 2n+3 variables with 4n+6 inequality constraints. I was trying to use Mathematica's LinearProgramming function. When n is small, like less than 30, it gives outcome ...
- 91
7
votes
0
answers
295
views
Bug: Calling `SetSharedVariable` while kernels are running hangs them up/crashes them
Bug introduced in 9.0 or earlier and persisting through 11.0.1 or later
Start a fresh kernel Quit, and maybe launch ...
CommunityBot
- 1
6
votes
0
answers
2k
views
ParallelTable::nopar: No parallel kernels available; proceeding with sequential evaluation
I am trying to use a the following code:
...
- 6,991
6
votes
0
answers
617
views
Can't Launch Kernels, Updating from Wolfram Research Server
So, I'm running Mathematica on an HPC cluster using the math module command line interface. I'm trying to figure out some problems with attempting to parallelize my ...
6
votes
0
answers
185
views
Parallelize Dataset Query: What is the best way to change Query "compilation"?
As per Mathematica Query documentation:
Before being applied, Query expressions are "compiled" into ordinary
compositions of ordinary Wolfram Language functions and their operator
forms. To ...
- 940
6
votes
0
answers
853
views
Death of parallel sub-kernels
EDIT : Finally, the new Mathematica 10.0 seems to fix it.
I have a little parallelization problem. I wrote a code to generate a quasicrystal by dynamical generation. Here the code:
...
- 4,371
6
votes
0
answers
600
views
Parallelizing is much slower than single kernel evaluation?
Starting with a vector of matrices, tVec, I would like to parallelize the multiplication of each element with the same matrix ...
