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xqute.scheduler

module

xqute.scheduler

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The scheduler to schedule jobs

Classes
  • Scheduler(workdir, forks, error_strategy, num_retries, prescript, postscript, jobname_prefix, recheck_interval, cwd, **kwargs) — The abstract class for scheduler</>
abstract class

xqute.scheduler.Scheduler(workdir, forks=1, error_strategy='ignore', num_retries=3, prescript='', postscript='', jobname_prefix=None, recheck_interval=600, cwd=None, **kwargs)

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The abstract class for scheduler

Attributes
  • jobcmd_wrapper_init — The init script for the job command wrapper
  • jobcmd_wrapper_init (str) — The init script for the job command wrapper</>
  • name — The name of the scheduler
Parameters
  • workdir (str | pathlib.path | cloudpathlib.cloudpath.cloudpath) — The working directory
  • forks (int, optional) — Max number of job forks
  • error_strategy (str, optional) — The strategy when there is error happened
  • num_retries (int, optional) — Max number of retries when error_strategy is retry
  • prescript (str, optional) — The prescript to run before the job commandIt is a piece of script that inserted into the wrapper script, running on the scheduler system.
  • postscript (str, optional) — The postscript to run when job finishedIt is a piece of script that inserted into the wrapper script, running on the scheduler system.
  • jobname_prefix (str | none, optional) — The prefix for the job name
  • recheck_interval (int, optional) — The interval to recheck the job status.Default is every 600 polls (each takes about 0.1 seconds).
  • cwd (str | pathlib.path, optional) — The working directory for the job command wrapper
  • **kwargs — Other arguments for the scheduler
Methods
method

create_job(index, cmd, envs=None)

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Create a job

Parameters
  • index (int) — The index of the job
  • cmd (Union) — The command of the job
Returns (Job)

The job

method

submit_job_and_update_status(job)

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Submit and update the status

  1. Check if the job is already submitted or running
  2. If not, run the hook
  3. If the hook is not cancelled, clean the job
  4. Submit the job, raising an exception if it fails
  5. If the job is submitted successfully, update the status
  6. If the job fails to submit, update the status and write stderr to the job file
Parameters
  • job (Job) — The job
method

retry_job(job)

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Retry a job

Parameters
  • job (Job) — The job
method

kill_job_and_update_status(job)

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Kill a job and update its status

Parameters
  • job (Job) — The job
method

polling_jobs(jobs, on, polling_counter)

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Check if all jobs are done or new jobs can submit

Parameters
  • jobs (List) — The list of jobs
  • on (str) — query on status: submittable or all_done
  • polling_counter (int) — The polling counter, used to limit the number of polls orskip some polls if the scheduler is busy.
Returns (bool)

True if yes otherwise False.

method

kill_running_jobs(jobs)

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Try to kill all running jobs

Parameters
  • jobs (List) — The list of jobs
method

job_is_submitted_or_running(job)

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Check if a job is already submitted or running

Parameters
  • job (Job) — The job
Returns (bool)

True if yes otherwise False.

method

job_fails_before_running(job)

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Check if a job fails before running.

For some schedulers, the job might fail before running (after submission). For example, the job might fail to allocate resources. In such a case, the wrapped script might not be executed, and the job status will not be updated (stays in SUBMITTED). We need to check such jobs and mark them as FAILED.

For the instant scheduler, for example, the local scheduler, the failure will be immediately reported when submitting the job, so we don't need to check such jobs.

Parameters
  • job (Job) — The job to check
Returns (bool)

True if the job fails before running, otherwise False.

method

jobcmd_shebang(job) → str

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The shebang of the wrapper script

method

jobcmd_init(job) → str

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The job command init

method

jobcmd_prep(job) → str

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The job command preparation

method

jobcmd_end(job) → str

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The job command end

method

wrap_job_script(job)

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Wrap the job script

Parameters
  • job (Job) — The job
Returns (str)

The wrapped script

method

wrapped_job_script(job)

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Get the wrapped job script

Parameters
  • job (Job) — The job
Returns (SpecPath)

The path of the wrapped job script

abstract method

submit_job(job)

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Submit a job

Parameters
  • job (Job) — The job
Returns (int | str)

The unique id in the scheduler system

abstract method

kill_job(job)

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Kill a job

Parameters
  • job (Job) — The job
abstract method

job_is_running(job)

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Check if a job is really running

Parameters
  • job (Job) — The job
Returns (bool)

True if yes otherwise False.