问题
I would like to know all necessary criteria required for snakemake to decide that a job needs to be executed, but I couldn't find them in their documentation. The best source I have found is in snakemake author's slides from 2016, which says:
A job is executed if and only if
- output file is target and does not exist
- output file needed by another executed job and does not exist
- input file newer than output file
- input file will be updated by other job
- execution is enforced
However it appears he has stopped using that slide since then, which makes me wonder if above criteria have changed now.
回答1:
This page of their documentation has a link to the slides from 2019: https://snakemake.readthedocs.io/en/stable/tutorial/tutorial.html. On the page 26 of the slides you may see the same set of rules: https://slides.com/johanneskoester/snakemake-tutorial#/25:
Job execution
A job is executed if and only if
- output file is target and does not exist
- output file needed by another executed job and does not exist
- input file newer than output file
- input file will be updated by other job
- execution is enforced
determined via breadth-first-search on DAG of jobs
I guess that nothing has changed in these rules since 2019, especially taking in the consideration that this presentation is referenced from the official tutorial page.
来源：https://stackoverflow.com/questions/62419042/what-are-the-conditions-for-snakemake-to-execute-a-job