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.
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After some calculations, Mathematica forgets previous results
After I do some calculations, the next calculation often just returns the previous declared result as a name and I have to start all over.
My "parallel kernel configuration" is set to "manual" with ...
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Nonsparse SparseArray crashes the Kernel
Bug introduced in 10.0 and fixed in 11.1
On Windows 10, 64 bit, version 11.0.1, my kernel just started crashing for no reason as for as I can see. Does/should the following crash your kernel?
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Can I run more than two kernels simultaneously on my MacBookAir laptop?
I'm running Version Number 10.0.1.0 with Platform
Mac OS X x86 (32-bit, 64-bit kernel).
I have two Mathematica programs running using "Local" and
"Alternative Local Kernel".
Is this the most I can ...
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Programmatically access the data from the Parallel Kernel Status window
I want to show the parallel kernel status within a notebook, and not in the separate Parallel Kernel Status window.
How can I programmatically access the Performance Measurements data shown in the ...
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Why FindMinimum crashes the kernel in specific situation
Bug introduced in 11.0.0 and fixed in 11.1
I have found that FindMinimum crahses is a certain situation. Here is my minimal working example:
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ParallelTable Automatically kill MathKernel
At the moment I continously encounter the problem that while using ParallelTable the process kswap needs all the memory, while the four running MathKernels receive almost zero %Memory, which slows ...
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Detecting kernel initialization
Certain operations do not work during kernel initialization. Code from Kernel/init.m, the Autoload directory, or packages set ...
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Restarting Mathematica automatically
I run a large computation in a loop. At each cycle of the loop
I produce large arrays that I save on a disk. At each cycle I would like to Quit Mathematica and ...
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Import JPEG Fails
Bug introduced in 11.0.0 and persists through 11.0.1
I have a set of .jpg files that not only fail Import[] but also crash the kernel. Sample file here.
There is ...
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Abort all evaluations via command
Is there a command to abort all evaluations in a Mathematica Kernel? Basically I want something like:
somecode;
AbortAll[];
morecode;
Where the ...
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Autocomplete in wolfram (the Wolfram Language kernel in a shell)
Is is possible to have an autocomplete feature in the CLI of Wolfram Language kernel?
I use the Raspberry Pi edition.
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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 ...
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Mma11 on Windows: Forgetful kernel?
I am seeing the following issue on Windows 7 x64, with the new Mma 11:
I define the simple function below, and evaluate it. The first time is fine, but after that the kernel seems to have forgotten ...
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Mathematica versions 10 and 11 fonts are broken on Linux
Any clues on how to fix the fonts? It seems the font kerning is wrong. It happens both in graphics and in all sorts of text styles...
This happens with Mathematica system fonts but also with certain ...
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How to tell Mathematica do parallel computation?
I am using NDSolve on a workstation with 6 kernels. To speed up the simulation I have used LaunchKernels[] to load all the ...
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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 ...
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Any kernel monitor alternatives?
Sometimes the Parallel Kernel Status looks like this:
Is there any way to visualize the kernels without using the built in tool?
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Simutaneously evaluate two expression in the same notebook [duplicate]
Suppose I have two expressions in the same note book but in different cells, both of them take much time to evaluate. In general, mathematica waits until the first expression is done, then evaluate ...
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Finish(Asynchronous)Dynamic[]
I have a question deriving from a recent topic Synchronizing Dynamics with EventActions.
tl;dr;
How to authoritatively explain the influence of ...
Kuba♦
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Why doesn't Mathematica abort evaluation when I tell it to?
This frequently happens to me. I'll have some code, execute it, and realize it's taking a long time. My PC isn't frozen, and Mathematica itself isn't even frozen: I can select stuff in the notebook, ...
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How does the Kernel know the $Context in a localized notebook
SetOptions[EvaluationNotebook[], CellContext -> Notebook]
$Context
"Notebook$$70$398424`"
And from different ...
Kuba♦
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Is the renaming mechanism of `With` flawed?
I'm confused about the renaming mechanism of With:
...
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Easy way to close all Mathematica kernels?
When developing functionalities with several parallel kernels, when a bug happens, I often have to manually close all parallel kernels (using the Task Manager in Windows) in order to start again from ...
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Kernel crash after simple input of variable defintion
Fixed in 10.3.0
I have encountered a very surprising and annoying kernel crash:
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Kernel randomly aborting
Bug introduced in 10.0 and fixed in 10.3
So after 2 days of trying to figure out what's going on, I figure I should post here as I don't have enough knowledge about the Mathematica evaluation process ...
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Mathematica does not responding [duplicate]
These days, when I opened mathematica 10.4 in Windows 10, I even cannot type three characters, and it stucks. Yes, every time when I type the third number or character, it stops. I found that, even, I ...
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Why would killing the kernel defreeze/unhang the front end?
My Mathematica front end will freeze occasionally for unreproducible reasons. This seems mostly associated with long (> 1 hour) computations, although not exclusively. If I click on the Mathematica ...
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Determine how Mathematica was started
I have a notebook that I also execute as a m file on the command line.
Depending on whether I run the notebook or the m file, I want to use slightly different commands.
For example, ...
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Is there any way to see a kernel function's code? [closed]
I was using the extremely useful function PrintDefinitions from the GeneralUtilities package and I encountered this:
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Global context seems to be shared between kernels when using Clear?
I am trying to understand the following behaviour, and determine if it's a bug in Mathematica 10. I am using Mathematica 10.3, and can't reproduce this behaviour under Mathematica 9. The test outlined ...
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Handling Kernel start. What is a full initialization stack and what place the Autoload has there?
According to: tutorial/WolframSystemSessions
Initialization
On startup, the Wolfram Language kernel does the following:
Performs license management operations.
Runs Wolfram Language ...
Kuba♦
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Handling Kernel quit
One can use $Epilog to do something when the Kernel is quit or put an end.m file next to the ...
Kuba♦
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What causes the error NotebookEvaluate::nbnfnd?
Help says:
NotebookEvaluate can take either a NotebookObject or a filename referencing a notebook file.
therefore, I wonder why
...
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Pitfalls of running multiple Mathematica kernels?
I've recently started running long calculations in one Mathematica kernel while I continue to work in another kernel. I thought this was safe, but yesterday I was running THIS CODE in which a ...
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ParallelTable should distribute dedicated evaluation range to different kernels
I have 4 kernels and would like that in ParallelTable:
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ParametricPlot3D crashes Kernel when called repeatedly in loop
I have a parametric function surf[u,v]. It can be plotted successfully like this: ...
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V 10.3.1 kernel crashes after an evaluation on Mac OS X El Capitan
I tried to solve a simple system of first order differential equations an then an algebraic system in Mathematica 10.3.1 on my MacBook Pro. I did't have a problem with Mathematica until today. Here's ...
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How to clean up temporary files when the kernel exits?
There are Mathematica packages that must create temporary files to function. If we are implementing such a package ourselves, how can we ensure that the temporary files will get cleaned up when the ...
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How to deal with MathLinkException in webMathematica
I'm using webMathematica, my license supports a maximum of two kernels running at the same time. Sometime an error occurs, I've seen three at least (from webMathematica.log):
...
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License not released after kernel is stopped for KernelTimeLimit reached? [closed]
Using webMathematica, doing massive tests of our functions (each call can take from 0 to 15 seconds). After a while we started getting lots of 403 Forbidden errors.
webMathematica.log:
...
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`ParallelTable` pending the MathKernel after execution
I have done a ParallelTable computation in script mode. After execution, the output is fine and I've got all the data I needed. but the kernel seems pending, ...
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Starting notebook from text mode
I am trying to start new notebook from a command line mode with command UsingFrontEnd@CreateDocument[] The notebook is created but it stays in minimized mode at the ...
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How to export a list of numerical data to a file in the terminal?
I have a very simple program that export a list to a data file in table form.
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How to restart computation when kernels die?
When an important process needs to be kept alive, there are monitoring tools to restart them if they die (e.g. god tasks in ruby), in my case I have an overnight scraping task that I need to have done ...
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how to share variables between subset of notebooks
I have some notebooks belonging to a project. I want them to share definitions with each other, but not with other notebooks.
Here is one approach that I thought would accomplish this: go to ...
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LaunchKernels behavior
I have one processor with 2 cores on my local computer.
CloseKernels[];LaunchKernels[]
(* {"KernelObject"[1, "local"], "KernelObject"[2, "local"]} *)
I can't ...
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Problems with Fedora 22 and Mathematica 10.2/10.3
I'm using Fedora 22 Linux distribution and since I switched to Mathematica 10.2 I'm experiencing some very weird behavior of the frontend. From time to time, the frontend would freenze for a few ...
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