Questions tagged [kernel]
The Kernel is the back-end application thread that does the actual evaluation of all non-graphical expressions. It can be accessed directly through the console but is more commonly working behind the scenes to power the Notebook Interface. Multiple Kernels may be run for parallel computation.
359
questions
1
vote
0
answers
48
views
Independent and interdependent notebooks
My Mathematica 11.2 home edition license under Windows 10 allows only for two independent notebooks/processes at a time. Is this what the Mathematica license calls "2 Frontends"? Does this ...
- 401
0
votes
1
answer
25
views
Setting shared function values in parallel is running sequentially
I am trying to define a function whose values can be updated across different Kernels running in parallel, where each Kernel might have to use values defined by other Kernels previously in the process....
- 1,146
0
votes
0
answers
32
views
Parallelization with Do and ParallelSubmit
I have quite a large expression that I need to integrate. My ansatz was to Expand the expression (easiest case results in ~5.5 million terms) and parallelize the ...
- 1,441
0
votes
0
answers
22
views
Relaunch failed kernels at runtime
I'm running a local calculation that takes around 4 days to complete. After the first time, I noticed that it started on 16 kernels but subsequently some of those kernels failed (and the workload was ...
- 1,441
0
votes
2
answers
81
views
Need help to understand subtle difference using Replace in Association
Consider these two rules, which I initially considered as equivalent. Now I use rulesPlusMultScalarAssociationA as a "bug fix" in my code and use it instead of my "buggy" ...
- 3,680
2
votes
1
answer
64
views
Not able to use multiple notebook at a time
I have recently shifted to Macbook Pro M3 and having problem in running multiple notebook at a time. In Ubuntu I could open as many notebook as I want directly by clicking the notebooks. Now in Mac, ...
- 21
2
votes
0
answers
73
views
Changes in the kernel across versions
I was going through the Power programming book by David Wagner, and I tried:
...
- 669
1
vote
1
answer
88
views
How to show all bandwidth in adaptive bandwitdh KDE?
I have implemented the KDE distribution finding for a dataset. I apply the adaptive bandwidth method; I want to plot the change in bandwidth over the entire distribution. How can I do it? Thank you!
2
votes
0
answers
128
views
ParallelTable does not execute in parallel
I would like to construct a Table in Parallel in Mathematica. However, it only uses one Kernel for the calculation, the others run idle. My code looks like this (I will remove a big chunk of the ...
- 21
0
votes
0
answers
57
views
Is loading several packages in the same cell safe, or it may cause probems?
My Mathematica 13.3 crashed after working 30 minutes. It produced a beep and no output. After that, it lost the capability of loading packages. I will reinstall it now. I wonder if this happened to ...
- 1,982
1
vote
2
answers
151
views
Mathematica kernel dies
When I run the following code, the kernel dies. I have tried making a new kernel, but that also does not work. The memory usage never crosses 33% of the total RAM available. I have no clue how to fix ...
- 141
2
votes
0
answers
43
views
How can I cap calculation speed?
Sorry if I wasn't able to find an existing answer!
I'm trying out Mathematica, and was running through some sample problems at night. My roommate is sleeping, and my computer fan can get decently loud....
- 21
6
votes
0
answers
152
views
ListLinePlot in Version 13.3.0 causes the kernel to stop
Bug introduced in 13.3.0 or earlier and persisting through 13.3.1 or later
I have upgraded to version 13.3.0. I find that when I plot a data set using ListLinePlot ...
- 16.6k
3
votes
0
answers
79
views
Why global name context in 13.3 is not empty?
Today I tried 13.3.0 and immediately find that global name context again is not empty, i.e.
...
- 3,680
6
votes
2
answers
180
views
Recovering results during front-end hang
When working with large expressions I sometimes mistakenly ask Mathematica to show some output which causes the front end to hang. Sometimes it just needs to format notebook contents but sometimes, it ...
- 1,620
4
votes
2
answers
198
views
Automate quitting and restarting Kernel while doing Evaluate Notebook
I have multiple notebooks open, with similar variable declaration (am studying test cases), and I want all notebooks to be independent of each other, and also forget it's own evaluation after ...
- 143
3
votes
1
answer
432
views
Mathematica can't communicate with subkernels
i was working some huge matrices in the context of FEM, so sometimes it seems they were too big and the kernel crashed. Normally that isn't a problem, but after one time i couldn't connect to the ...
- 91
0
votes
0
answers
20
views
Best practice to persist symbols between sessions and a problem with $Epilog [duplicate]
I often define functions like this in my notebooks:
ClearAll[f];
f[a_, b_, c_] := f[a, b, c] = f[b, a, c] = somethingExpensive[a, b, c]
where I use memoization to ...
- 3,033
2
votes
0
answers
80
views
How to automatically open/create/run each notebook using its own kernel?
I am not asking question such as new kernel for notebook where one needs each time to explicitly create and name new kernel, then again issue a command in the notebook to use that named kernel.
This ...
- 149k
3
votes
1
answer
48
views
Parallel Kernel inheritance problem for Protect
for the following program:
Unprotect[Power];
Power[0, 0] = 1;
Protect[Power];
ParallelTable[0^0, {4}]
I have the following result:
(kernel 1) Power::indet : ...
- 421
1
vote
0
answers
264
views
Mathematica does not recognize all CPU kernels/cores [closed]
I am using Ubuntu 22 and Mathematica 13. According to the description of my laptop I should have four CPU cores, as seen in the following screenshot:
However, Mathematica only seems to recognize two ...
4
votes
3
answers
126
views
How to evaluate EXPR in a subsession of a different already running kernel and get the output?
Is there a way to evaluate some expression in a subsession of another already running kernel, collecting the output, from a Local monitoring kernel? Something like
...
2
votes
1
answer
54
views
Aborting the loop using external events
If we run one Wolfram Kernel (Wolfram Engine) there is one thread we can use
While[True,
doSmth;
Pause[0.1];
];
since there is a sort of interruption ...
- 1,365
1
vote
0
answers
101
views
How to configure and acess Remote Kernel step-by-step?
I want to access a kernel from another computer. However, I have no idea how to set up the remote kernel and how to access it. I have gone through a lot of articles on this website and others, but ...
- 2,688
3
votes
0
answers
79
views
Maximum number of concurrent notebooks
I am running MMA v13.2 on Windows 10, x86.
If I open two different notebooks, everything is fine.
Try opening a third and it displays
Of course, the operation fails because the software is already ...
- 3,410
2
votes
0
answers
112
views
Restart kernel after each evaluation in Table
I am trying to integrate a two-dimensional function purely numerically. For one coordinate the integrand can oscillate rapidly while for the other coordinate the integrand is not behaving in a special ...
- 21
2
votes
1
answer
69
views
Why does the console REPL parse input differently from ToExpression?
In the console REPL, we can see that input is parsed in a certain way, that is not equivalent to simply calling ToExpression on the input string. From math.exe using Mathematica 13.1:
...
- 21
0
votes
0
answers
52
views
TimeConstrained[] Not working
Is there a way to force the kernel to quit if some code runs for x seconds? Currently, I have:
...
- 33
2
votes
1
answer
176
views
How do I know which kernel is handling which .nb file? [closed]
OS : window 10
Mathematica : v12.2
By my mistake, I opened another mathematica kernel, not knowing a kernel was already running.
I created a lot of .nb files and worked on them in another kernel,
...
- 4,325
1
vote
0
answers
75
views
How to determine why Mathematica killed an evaluation and cleared all variables? [closed]
I am curious if Mathematica stores a system log somewhere or if there is a way to set up my notebook such that it details why Mathematica silently kills an evaluation and clears all variables in the ...
- 11
1
vote
1
answer
56
views
Unexpected quitting of the kernel when discretizing parametric region
I have a region defined parametrically (-actually the union and difference of several ones), and when I try to discretize it Mathematica suddenly quits the kernel, as show in the picture below (I'm ...
- 609
1
vote
0
answers
124
views
Execute wolfram command from java & j/link along with set of variables [closed]
I have been trying to execute some expression/formula which may have multiple variable, and I want to set values(like how we do on kernel command tool). We are using J/Link to connect kernel from java....
- 11
0
votes
0
answers
46
views
Remote kernel works in terminal but not in Notebook
I am using a Mac OS 12.2.1 computer that's trying to connect to a remote kernel in a Windows 10 computer. I am able to connect to that computer via ssh in terminal. Inside the terminal, I can launch a ...
- 2,031
0
votes
0
answers
118
views
FullSimplify crashes kernel
I'm trying to simplify an enormous analytic expression as much as possible. When I use Simplify, I get a half-decent result in about 20 seconds. However when I use <...
- 431
4
votes
0
answers
72
views
Area mapped over list of 2 polygons crashes kernel depending on order
I have a list of 2 Polygon objects (see below for the list polys and a visualization). They are all seem valid. Still, when I ...
- 295
6
votes
2
answers
93
views
Error message not reproduced at reevaluation, SetDelayed cache?
Mathematica v13.0:
nr:=HoldForm@Evaluate@Function[t,x@t][]
then evaluate
...
- 889
10
votes
3
answers
1k
views
How to clear up RAM without exiting kernel?
I am trying to implement the code which generates some table, works with it, extracts some numbers, add them to some other table, then clears the table (only the table and not the other elements of ...
- 5,913
4
votes
0
answers
432
views
How to allocate more physical memory to Mathematica?
My MacBook Pro (2019) has 32 GB of memory, but when I work with a large array reaching 1 GB of storage, the Mathematica Kernel only gets a little more of 1 GB, but gets allocated a lot of virtual ...
- 1,258
0
votes
0
answers
235
views
Best way to run multiple calculations simultaneously?
I feel this question probably has been asked before, but I can't find a thread with a clear enough answer. Let me know if you can help locate anything useful.
As the title suggests, I want to run ...
- 4,738
1
vote
0
answers
53
views
How module checks if syntax is correct?
I would like to understand the following module subtlety.
Consider two seemingly equivalent instances
Module[{temp}, Sequence[x, x]]
(Module::argrx: Module called ...
- 3,680
0
votes
1
answer
82
views
How to count Kernel evaluations then call a function on every nth evaluation
On every nth (2) evaluation autoEval should invoke a function check[]. The thing which is supposed to listen for all ...
- 2,467
1
vote
2
answers
329
views
Mathematica: How can I solve the problem "The Kernel Local has quit (exited) during the course of an evaluation"
I am using a Mac Book with Monterey and 16GB RAM for a calculation with 2 nested For loops.
I am relatively new to Mathematika and still trying to learn the language properly, so I hope the problem is ...
2
votes
0
answers
500
views
Mathematica 12.3 won't launch. Freezes on 'opening welcome screen' and turns off [closed]
Mathematica 12.3 won't launch. Freezes on 'opening welcome screen' and turns off.
Mathematica Kernel works properly.
Specifications:
Version: 12.3.1 for Microsoft Windows (64-bit) (June 24, 2021)
...
- 21
0
votes
0
answers
164
views
How can we tell if an evaluation has corrupted or is still on-going properly?
I was trying to evaluate a NDSolveValue function of mathematica, but it is taking excessively long time (~30 min) now. I am not sure if I shall leave it alone or quit the kernel.
Is there a general ...
- 53
0
votes
0
answers
51
views
Is it possible to run kernel in address space of another process?
Kernel executables seem to be relatively small wrappers around "dynamic link library" that contains all the functionality of the kernel.
Is it possible to load the kernel (as a dynamic link ...
- 1,345
0
votes
0
answers
493
views
how to run multiple notebook at the same time using multiple kernels
My problem is that the second notebook file opens but waits for the first notebook to be evaluated. I want to execute both file1.nb and file2.nb at the same time. Here is my code.
any idea?
...
4
votes
1
answer
139
views
How to add new coordinate chart?
I want to add my own coordinate system to existing CoordinateChartData[All], which would mimic the standard functionality as much as possible. As a simple work ...
- 3,680
0
votes
0
answers
51
views
Using generalized hypergeometrics in RegionPlot hangs the Kernel
This simple code, is just an example, hangs the kernel:
RegionPlot[
x + y + HypergeometricPFQ[{1, 2.5, 3.1}, {4.65, 3.28}, 0.2] >
0, {x, -1, 2}, {y, -2, 3}]
...
5
votes
0
answers
203
views
How to allow one process to take advantage of all available cores while other processes run in parallel?
I have to run multiple tasks simultaneously:
Data download from stock exchange during live market session and append it to a global variable.
Process the data by taking the data from the front of the ...
- 413
4
votes
0
answers
75
views
On auto-limiting memory and other resource usage
I play fast and loose with my evaluations, so try to calculate something much too large at least once a day. Life has gotten a lot easier ever since I started setting:
...
- 763