Feature #1755
Add "seed" parameter to cspull
| Status: | Closed | Start date: | 04/11/2016 | |
|---|---|---|---|---|
| Priority: | Normal | Due date: | ||
| Assigned To: |  Mayer Michael | % Done: | 0% | |
| Category: | - | |||
| Target version: | 1.1.0 | |||
| Duration: |
Description
I have the use case to generate pull distributions for a large observation container (>200 hours). When running cspull each individual trial takes quite some time to compute. Ideally, I would want to run cspull on several machines in parallel and merge the resulting files afterwards to do the plotting.
For this purpose it is necessary that each simulation runs with a different seed. I therefore propose to introduce the parameter seed in cspull that is then passed to the simulation. Thus the user could steer if each job of cspull would give same results or not.
Recurrence
No recurrence.
History
#1
Updated by Knödlseder Jürgen about 8 years ago
Fully agree. We can add a hidden seed parameter.
This brings up an interesting issue: how to parallelize Python scripts? Python itself cannot be parallelized due to a global interpreter lock. But there are modules, which however are not standard.
On the other hand: have you had several observations in a container, or was this just a single long observation. In the former case, ctobssim and ctlike should be parallelised.
#2
Updated by Mayer Michael about 8 years ago
On the other hand: have you had several observations in a container, or was this just a single long observation. In the former case, ctobssim and ctlike should be parallelised.
I was having a large number observations in the container with various pointing positions (>400 observations). My idea was to simply split the computation into several jobs. Each job running cspull with e.g. 20 trials. ctobssim and ctlike already support openmp internally.
We just have to take care that the seed for each ctobssim job is unique, that we don’t simulate things multiple times and thus falsify the pull distribution.
I can come up with a solution for cspull using the seed parameter.
#3
Updated by Mayer Michael about 8 years ago
- Status changed from New to Pull request
pull request on branch 1755-seed-for-cspull
#4
Updated by Knödlseder Jürgen about 8 years ago
- Status changed from Pull request to Closed
- Assigned To set to Mayer Michael
- Target version set to 1.1.0
- Start date set to 04/11/2016
Merged into devel.