Skip to main content

remote access - Is there a way to detach/reattach the Frontend from a running Mathematica Kernel?


I perform long calculations on a fast remote machine running the Mathematica kernel, where I followed the very useful guide Remote Kernel Strategies to establish the connection. I wonder, however, if there is a way to detach the Frontend from the running kernel in the same way as one can use the Linux program screen to keep remote shell sessions alive. I couldn't find anything similar for Mathematica, even though such a feature would be very convenient. Is there a way of doing that?


Many thanks,


Andreas.




Answer



This comes a little late, but this is my solution:


Remote Machine running linux with tmux (similar to screen but newer, should work with screen but I dont know the commands) and Mathematica 10 installed.


Local Machine running MacOS Yosemite with Mathematica 10.




  1. Launch tmux in remote machine and execute Mathematica:


    tmux


    wolfram (executable to mathematica in terminal mode)





  2. Now create a link with TCPIP protocol. Record the linkname="linkPort1@remoteIP,linkPort2@remoteIP" generated.


    link=LinkCreate[LinkProtocol -> "TCPIP"]                                
    LinkObject[linkPort1@remoteIP,linkPort2@remoteIP, 72, 1]


  3. Now in local machine, start Mathematica and go to Evaluation->Kernel Configuration Options -> Add... and fill out the window just as showed below.Dont forget to replace (insert remote ip ) by the remote machine ip address and insertLinkName by the link name that was generated above enter image description here clic ok. Then open a new notebook and set the above created kernel as the notebooks kernel. Dont evaluate anything yet in this notebook.




  4. Go back to your remote machine and run



    $ParentLink=link


  5. Finally go back to the notebook in your local machine and evaluate something:


    $Version 


So now you are running the kernel in the remote machine with the front end in your local machine.





  1. To disconnect from the Kernel, evaluate the following in your notebook:


    LinkClose /@ Links[]


At this point your kernel is still running in the remote machine. To reattach follow steps 2 through 5.


This could be automatized with a script. Also if you know that a port is always available, you could set the link with a persisten name so that you dont have to reconfigure the remote kernel each time you attach.


Comments

Popular posts from this blog

mathematical optimization - Minimizing using indices, error: Part::pkspec1: The expression cannot be used as a part specification

I want to use Minimize where the variables to minimize are indices pointing into an array. Here a MWE that hopefully shows what my problem is. vars = u@# & /@ Range[3]; cons = Flatten@ { Table[(u[j] != #) & /@ vars[[j + 1 ;; -1]], {j, 1, 3 - 1}], 1 vec1 = {1, 2, 3}; vec2 = {1, 2, 3}; Minimize[{Total@((vec1[[#]] - vec2[[u[#]]])^2 & /@ Range[1, 3]), cons}, vars, Integers] The error I get: Part::pkspec1: The expression u[1] cannot be used as a part specification. >> Answer Ok, it seems that one can get around Mathematica trying to evaluate vec2[[u[1]]] too early by using the function Indexed[vec2,u[1]] . The working MWE would then look like the following: vars = u@# & /@ Range[3]; cons = Flatten@{ Table[(u[j] != #) & /@ vars[[j + 1 ;; -1]], {j, 1, 3 - 1}], 1 vec1 = {1, 2, 3}; vec2 = {1, 2, 3}; NMinimize[ {Total@((vec1[[#]] - Indexed[vec2, u[#]])^2 & /@ R...

functions - Get leading series expansion term?

Given a function f[x] , I would like to have a function leadingSeries that returns just the leading term in the series around x=0 . For example: leadingSeries[(1/x + 2)/(4 + 1/x^2 + x)] x and leadingSeries[(1/x + 2 + (1 - 1/x^3)/4)/(4 + x)] -(1/(16 x^3)) Is there such a function in Mathematica? Or maybe one can implement it efficiently? EDIT I finally went with the following implementation, based on Carl Woll 's answer: lds[ex_,x_]:=( (ex/.x->(x+O[x]^2))/.SeriesData[U_,Z_,L_List,Mi_,Ma_,De_]:>SeriesData[U,Z,{L[[1]]},Mi,Mi+1,De]//Quiet//Normal) The advantage is, that this one also properly works with functions whose leading term is a constant: lds[Exp[x],x] 1 Answer Update 1 Updated to eliminate SeriesData and to not return additional terms Perhaps you could use: leadingSeries[expr_, x_] := Normal[expr /. x->(x+O[x]^2) /. a_List :> Take[a, 1]] Then for your examples: leadingSeries[(1/x + 2)/(4 + 1/x^2 + x), x] leadingSeries[Exp[x], x] leadingSeries[(1/x + 2 + (1 - 1/x...

plotting - Plot 4D data with color as 4th dimension

I have a list of 4D data (x position, y position, amplitude, wavelength). I want to plot x, y, and amplitude on a 3D plot and have the color of the points correspond to the wavelength. I have seen many examples using functions to define color but my wavelength cannot be expressed by an analytic function. Is there a simple way to do this? Answer Here a another possible way to visualize 4D data: data = Flatten[Table[{x, y, x^2 + y^2, Sin[x - y]}, {x, -Pi, Pi,Pi/10}, {y,-Pi,Pi, Pi/10}], 1]; You can use the function Point along with VertexColors . Now the points are places using the first three elements and the color is determined by the fourth. In this case I used Hue, but you can use whatever you prefer. Graphics3D[ Point[data[[All, 1 ;; 3]], VertexColors -> Hue /@ data[[All, 4]]], Axes -> True, BoxRatios -> {1, 1, 1/GoldenRatio}]