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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735 views

How is the Mathematica kernel structured internally, and how does evaluation work?

There is so much information available for Java--the internal details of (for example) the JVM memory manager are well-documented, and the performance considerations arising from its interaction with ...
6
votes
1answer
532 views

Accessing data on local machine from remote kernel

I have a remote kernel on a server that I would like to use to process some data. The connection works, i.e, I'm able to use the local front end and the remote kernel. However, I cannot figure out how ...
6
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2answers
322 views

Why does Mathematica stop when run in the background in command line mode?

If I try to start a Mathematica script in the background from the command line, like this: math -script someFile.m & then the process gets automatically ...
6
votes
1answer
418 views

Using “Raw MathLink Connections” to create a “Kernel Object”

Mathematica 8.0.0: I am stuck trying to get a Mathematica Mathlink connection from my Windows computer working that should connects to Linux over network (or vice versa) and then launches a Kernel on ...
6
votes
1answer
540 views

Remote Kernel configuration works in v9 but not in v10

I have both v9 and v10 currently installed on my computer (Windows 7). For reasons that are not entirely clear, if I create a new remote kernel in one version, it is accessible to the other; however, ...
6
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1answer
259 views

Context “Unique to This Notebook” makes variables black even if they're not defined?

I'm trying to use this technique to keep variables separated between different notebooks. It seems to be working fine, except that variables turn black as soon as they are evaluated — any ideas why ...
6
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1answer
100 views

When I run multiple Mathematica programs from terminal, are they supposed to use different Kernel?

Since I found that when I using notebook interface, I need to assign different kernels to different notebooks (if I want to run them at the same time), I wonder if I run those *.m files from terminal ...
6
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0answers
219 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 ...
6
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0answers
171 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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3answers
1k views

Remote Mathkernel: SSH encountered a networking error while launching kernel Error code = 1

I have a problem concerning the connection to a remote kernel via ssh on a vpn. I found a working configuration in this question: Connection to remote kernel can not be established - No specific ...
5
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1answer
86 views

How to avoid kernel shutdown when importing a file

I am importing a CIF file and the Kernel shutdown (Mathematica 10). The only instruction is this Import["myfilename.cif"] I tried CheckAbort unsuccessfully. How can I catch the error and keep ...
5
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2answers
125 views

How can I run a list of Tasks serially?

I have a list of ScheduledTask's to run in sequence one at a time. How can I set these to run in order so that the next one starts automatically after the previous one finishes?
5
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1answer
186 views

How to understand the difference between Sqrt and Log after ClearAll them

I came across this post, here I change the last line of the code Unprotect[Sqrt]; Sqrt[x_] = "blahblah"; Protect[Sqrt]; Sqrt[2] "blahblah" ...
5
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1answer
98 views

Is there a way to monitor the memory used by mathematica as a dynamic expression?

I always use the terminal's htop for this, but wouldn't it be nice to visualize per kernel the memory used in a dynamic expression?
5
votes
1answer
275 views

Why is $ProcessorCount different than the selected number of cores in PBS?

By using ParallelTable and submitting my Mathematica code to a cluster, I noticed that it was enhancing the speed even when I selected a single core in a single ...
5
votes
1answer
33 views

How could I set TimeConstrained globally?

I want to set TimeConstrained globally, I tried use $PrePrint as bellowed script: ...
5
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1answer
90 views

Changing MathKernel process priority on the startup

In the built-in Documentation there is an example how it is possible to change the priority of the MathKernel process using NetLink: ...
5
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2answers
100 views

Behavior of $PreRead in Kernel

I am interested in making a simple accounting style line calculator that allows me to interact with it something like this: ...
5
votes
1answer
109 views

Clean webMathematica Kernel

On my webMathematica server, certain input values are being saved between page loads on different computers. I assume this is because the kernel is not clearing the values after it finishes loading a ...
5
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0answers
289 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 ...
4
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2answers
316 views

Keep kernel running for execution of scheduled task

How can I keep a kernel running until all scheduled tasks have completed? For example upon running the following script bazinga.m: ...
4
votes
1answer
326 views

mathematica does not evaluate without internet access? [closed]

I am watching the video Hands-on Start to Mathematica Basic Graphics and for about 15 minutes I was trying to evaluate $\frac{\sin x}{x}$ and each time I encountered errors like: The result can ...
4
votes
1answer
91 views

ListVectorPlot crashes kernel after two evaluations

I am currently trying to produce many plots by using ListVectorPlot, but every time I re-evaluate my code, the kernel crashes. I have set $HistoryLength=0 and ...
4
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2answers
124 views

Running bits of code in a separate kernel

I am using Mathematica to generate 3D graphics frame for a video. The process goes as follows: Loop over a counter i Use ...
4
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1answer
829 views

Connection to remote kernel can not be established - No specific error shown

I was trying to set up a remote kernel using Mathematica 8, a Debian server and a Mac OSX 10.8 client. First I configured a VPN connection between server and client and went through all the basic ...
4
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1answer
77 views

How can I kill one evaluator from another?

I have a kernel named A in one notebook and other notebook with kernel B, how can I kill B from A?
4
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1answer
137 views

Kernels permanently consume 100% CPU

I have a problem with Mathematica kernels consuming 100% CPU, even when they seemingly idle: I start Mathematica (version 10.1.0 for Linux x86, 64 bit on Linux 2.6.32, server with 4 cores, 16 GB RAM). ...
4
votes
1answer
604 views

Forget past outputs to free memory

While tinkering with a notebook that loads a large chunk of data in memory, I noticed that if I run it multiple times, the past chunks reside in memory. I understand that the reason (or one of) for ...
4
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1answer
98 views

what's the meaning of “-mathlink” as part of Arg for LinkLaunch?

LinkLaunch["MathKernel -mathlink"] LinkLaunch["MathKernel"] The both code line above can launch a MathKernel. What's the difference of them? what's the meaning of ...
4
votes
2answers
69 views

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 ...
4
votes
1answer
228 views

Trouble with Datasets in Version 10.0.1

Almost every morning, when I start my work, I observe the same problem as already mentioned here: Dataset Mathematica 10.0 and here: Dataset: cannot reproduce a basic example. A bug? I opend this new ...
4
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0answers
123 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 ...
4
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0answers
152 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 ...
3
votes
2answers
221 views

Reasoning about Degree of Polynomial

Apologies if this is outside of the realm of Mathematica -- I'm still trying to figure out the limits of how expressive Mathematica is (and how much of my work can be automated). Suppose I define the ...
3
votes
2answers
880 views

Is there a way to get user input when running a script on a Linux terminal?

I have access to a node of a Linux cluster, on which Mathematica is installed. However, I do not have access to a Linux GUI. Typically I write and test Mathematica scripts on my Windows personal ...
3
votes
1answer
377 views

How to connect the front end of one raspberry pi with the kernel of another

I followed the instructions in this howto from wolfram, but I keep getting the error: ...
3
votes
1answer
241 views

How to correctly disconnect from the kernel?

I'm connecting to and disconnecting from the kernel but I'm doing something wrong. I crash the text formatting in the terminal and got some warnings. There are some instructions to connecting to the ...
3
votes
1answer
143 views

Difference between Directory[] and NotebookDirectory[] .. a trailing /?

The following was the code: Directory[] NotebookDirectory[] The output was ...
3
votes
1answer
77 views

kernel not running script

I'm on under OS X trying to run a script through the kernel. My actual plan is to run a bash script which would call mathematica with an address to process a file. I have finished the code (with ...
3
votes
1answer
415 views

kernel Local crashes during the course of a For loop

I want to find the minimum of the function r[x,p] subject to the constraint w[x,p,t]==0 (t ...
3
votes
1answer
282 views

Parallel kernel and front end

I have a piece of code which looks like this: ParallelTable[ Monitor[ Table[ <code here> ,{i,i1,i2]; ,i]; ] so basically a ...
3
votes
1answer
45 views

LaunchKernels behavior

I have one processor with 2 cores on my local computer. CloseKernels[];LaunchKernels[] (* {"KernelObject"[1, "local"], "KernelObject"[2, "local"]} *) I can't ...
3
votes
0answers
59 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 ...
3
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0answers
83 views

What part of the kernel is open sourced? [closed]

Where exactly is the "large swath of the code base" that Stephen Wolfram said was open sourced?
3
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0answers
61 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 ...
3
votes
0answers
293 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: ...
3
votes
0answers
467 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 ...
3
votes
0answers
206 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 ...
2
votes
1answer
109 views

Kernel crashed after $RecursionLimit = Infinity

$RecursionLimit = Infinity; T[n_, k_]:= T[n, k] = If[n == 0 || k == 1, 1, T[n, k-1] + If[n<k, 0, T[n-k, k]]]; Table[T[n!, n], {n, 1, 9}] Without ...
2
votes
2answers
135 views

Change Temporary Directory

How to change the value of $TemporaryDirectory ? I need to change it because there is not enough space on the C drive and the calculation seems to stop after a while !