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As is defined above SLURM is the utility used at Altamira for batch processing support, so all jobs must be run through it. This part provides information for getting started with job execution at Altamira, (see the official slurm documentation to get more information on how to create a job) .
| Info |
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| NOTE: In order to keep the login nodes in a proper load, a 10 minutes limitation in the CPU time is set for processes running interactively in these nodes. Any execution taking more than this limit should be carried out through the queue system. |
Manage Jobs
A job is the execution unit for the SLURM. A job is defined by a script containing a set of directives describing the job, and the commands to execute.
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| Directive | Description | Default value |
|---|---|---|
--job-name=value | The name of the job that appears in the batch queue | script_name |
--output=... | The name of the file to collect the standard output of the job. The %j part in the job directives will be sustitute by the job ID. | file-%j.out |
--error=... | The name of the file to collect the standard error of the job. The %j part in the job directives will be sustitute by the job ID. | file-%j.err |
--workdir=... | The working directory of your job (i.e. where the job will run). If not specified, it is the current working directory at the time the job was submitted. | submitting directory |
--qos=... | Quality of Service (or queue) where the job is allocated. By default, a queue is assigned for the user so this variable is not mandatory. | main |
--time=... | The limit of wall clock time. This is a mandatory field and you must set it to a value greater than the real execution time for your application and smaller than the time limits granted to the user. Notice that your job will be killed after the elapsed period. | qos default time limit |
--ntasks=... | The number of processes to alocated as parallel tasks. | 1 |
--cpus-per-task=... | Number of processors for each task. Without this option, the controller will just try to allocate one processor per task. The number of cpus per task must be between 1 and 16, since each node has 16 cores (one for each thread). | 1 |
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| --mem-per-cpu |
Job examples
Example for a sequential job:
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