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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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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100 views

How to prevent the kernel from exiting when a LibraryLink function segfaults?

I do realize that this might be controversial, but I believe I have a real need for it this time. If a process tries to access memory at a location it doesn't own, it will by default exit with a ...
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141 views

How to write crash-robust code?

When a notebook crashes all the work I was doing is lost - I'd like to ameliorate this situation! Is there a way to decorate a symbol so that it is saved to disk whenever it changes, or after a ...
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2k 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 ...
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245 views

How to determine reason for kernel crash? -> Nelder Mead optimisation

I am making use of the Nelder Mead algorithm inside Mathematica's NMaximize to find a parameter set by solving the Schrodinger equation for a given system. (see ...
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176 views

In .NET/Link, how do I not open multiple kernels?

I'm writing an ASP.NET page intended for multiple users. On the backend we have datatypes that are primarily mathematical, and interact with Mathematica for string-to-double evaluations, among ...
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316 views

Why FrontEnd`KernelExecute doesn't work in KeyEventTranslations.tr?

Which commands can you put in KeyEventTranslations.tr ? There is an extensive list of FrontEndTokens, but what else can you use? Why something like this doesn't ...
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132 views

Suspend computation so it can be resumed even after the PC is rebooted

Sometimes a computation takes a long time. But when I sleep in the night, I want to shutdown my PC. Next morning when I wake, I want to start Mathematica and resume the computation. If you are ...
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158 views

MathKernel with `-noprompt` hangs indefinitely when converting simple TeX expression

If I enter MathKernel -noprompt -run 'ToExpression["1", TeXForm]; Exit[]' the kernel hangs, apparently while running TeX.exe ...
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81 views

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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78 views

Shared variables between notebooks using the same kernel not working in mathematica 10.1?

I am trying to access the variables over two Mathematica documents, this works fine when I use Mathematica 9 but when I attempt to do the same on 10.1 it doesn't work. I have set both notebooks to ...
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336 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: ...
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541 views

Remote kernel shuts down after several seconds

I have Mathematica 9 installed on two Windows Server 2008 R2 machines. Now i want to try using one of them as a frontend with local kernels and the other one for remote kernels. OpenSSH 6.5 for ...
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227 views

Launching Remote Kernels takes a lot of time

I recently played around with establishing a remote kernel setup without using mathematica grid. To do this I use the LaunchKernels[] command and ...
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38 views

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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63 views

`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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0answers
62 views

Long delays before showing the result in a notebook

I'm new to Mathematica. I have Version 10.3.0 running under Windows 10, 64-bit. If I open the 10.3.0 kernel and type 2 + 2 Shift Return I get an immediate answer. If I open the main program and ...
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81 views

Is there a way to specify which kernel is used to import files (SOLVED)?

Following up on a previous question in which I encountered a memory leak in the JSON importer I have created a SandBox script that will run the Import and analysis on a separate kernel, which be ...
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87 views

Kernel crash during numerical integral related to internet connection and WolframAutoUpdate

I am having silent kernel crashes whenever I attempt to evaluate a difficult 2D numerical integral. It is not consistently repeatable, in the sense that sometimes the same integral will evaluate ...
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81 views

How many kernels to set based on CPU?

Looks like 4 kernels are enough? My CPU is i7 4790K as given here. Does it also depend on the tasks and the codes? My understanding is that regardless what the benchmark says, I could always use ...
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178 views

How can I launch kernels in series using mathlink

I have written below code to launch n kernels connected to one another in series using mathlinks. Before you read the code allow me to be more precise what i want to achieve: Source kernel(k1) ...
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81 views

Integrate with Subscript: does this crash your kernel too?

I encountered some strange behaviour running v10.0.1 on a Mac Pro, while working with Integrate and Subscript. Starting from a ...
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71 views

$Epilog does not work when exit

The following code does work: $Epilog := Print@1; Quit[]; But if I close the document and exit WM or click QuitKernel, it does not work. Why?
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251 views

Kernel quits upon evaluation of a limit

Using 9.0.1 on OS 10.9.3, I evaluated Limit[(1 + t/Sqrt[n])^-n, n -> Infinity] at the start of a session and it caused an error that made the kernel quit. ...
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598 views

Runaway MathKernel!

I was running a simulation and everything went south (my fault, stupid coding error). So I quit the kernel. Everything was running very slowly, as if it were doing some kind of large calculation. ...
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26 views

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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21 views

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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174 views

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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49 views

License not released after kernel is stopped for KernelTimeLimit reached?

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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55 views

Random “silent” crash when running a math kernel in terminal for a long time

I sometimes use Mathematica to run very long calculations in the terminal (Debian). To do this I use the command: math -script (filename) Now after several hours ...
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31 views

Distribute Definitions to different Evaluator

I would like to pass on a definition from one Kernel to the other. With that I mean manually configured Kernels. In this case, I do not want to use the inbuilt Parallelization options, in order to ...
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0answers
52 views

How can I rename the local kernel without causing issues?

I would like to name my kernels. However when I remove "Local" Mathematica becomes unstable, sometimes crashes sometimes doesn't initialize correctly. Is there something special about the name ...
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0answers
105 views

Multiple scripts run using same kernel

I have an external program that calls Mathematica scripts upon certain events. Each script requires a large Mathematica library to load (takes a while). Is there some way to run an initial script ...
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0answers
826 views

Configuring Remote Kernel via terminal in Linux

There's a server at work, which I would like to use as a remote kernel. I have access to it via terminal (server is running Red Hat, my client Windows 7). I don't know if the kernel is set up or not, ...
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168 views

How to kill the kernel process from the command line without killing the frontend?

Sometimes the kernel hangs and I'd like to see if I can kill the math-kernel process without destroying my front-end session and losing the changes in my unsaved notebook!
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0answers
54 views

Initiating another Kernel?

How can I start a separate kernel to do other work, while I have Mathematica working on a problem that requires lots of computation time? I have a program that must be run for many hours, preventing ...
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84 views

Evaluating expressions stored in notebook from Java

The Mathematica kernel can generally open a notebook and evaluate the functions present in the notebook using UsingFrontEnd Command. Example: ...
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193 views

Save open Mathematica Notebook from command line or second Notebook to avoid data loss

I was executing a long Mathematica Notebook over night. The Mathematica instance is running on a Linux workstation (in a vnc server session to be precise). Now I cannot access this session anymore, ...