Please help with Threading

[Peter Otten]

Jurgens de Bruin wrote:

> This is my first script where I want to use the python threading module. I
> have a large dataset which is a list of dict this can be as much as 200
> dictionaries in the list. The final goal is a  histogram for each dict 16
> histograms on a page ( 4x4 ) - this already works.
> What I currently do is a create a nested list [ [ {}  ], [ {} ] ] each
> inner list contains 16 dictionaries, thus each inner list is a single page
> of 16 histograms. Iterating over the outer-list  and creating the graphs
> takes to long. So I would like multiple inner-list to be processes
> simultaneously and creating the graphs in "parallel".
> I am trying to use the python threading for this. I create 4 threads loop
> over the outer-list and send a inner-list to the thread. This seems to
> work if my nested lists only contains 2 elements - thus less elements than
> threads. Currently the scripts runs and then seems to get hung up. I
> monitor the resource  on my mac and python starts off good using 80% and
> when the 4-thread is created the CPU usages drops to 0%.
> 
> My thread creating is based on the following :
> http://www.tutorialspoint.com/python/python_multithreading.htm
> 
> Any help would be create!!!

Can you show us the code?