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Resource Allocation and Job Execution
=====================================
To run a [job](job-submission-and-execution.html),
[computational
resources](resources-allocation-policy.html) for this
particular job must be allocated. This is done via the PBS Pro job
workload manager software, which efficiently distributes workloads
across the supercomputer. Extensive informations about PBS Pro can be
found in the [official documentation
here](../../pbspro-documentation.html), especially in
the [PBS Pro User's
Guide](https://docs.it4i.cz/pbspro-documentation/pbspro-users-guide).
Resources Allocation Policy
---------------------------
The resources are allocated to the job in a fairshare fashion, subject
to constraints set by the queue and resources available to the Project.
[The Fairshare](job-priority.html) at Salomon ensures
that individual users may consume approximately equal amount of
resources per week. The resources are accessible via several queues for
queueing the jobs. The queues provide prioritized and exclusive access
to the computational resources. Following queues are available to Anselm
users:
- **qexp**, the \
- **qprod**, the \***
- **qlong**, the Long queue
- **qmpp**, the Massively parallel queue
- **qfat**, the queue to access SMP UV2000 machine
- **qfree,** the Free resource utilization queue
Check the queue status at <https://extranet.it4i.cz/rsweb/salomon/>
Read more on the [Resource Allocation
Policy](resources-allocation-policy.html) page.
Job submission and execution
----------------------------
Use the **qsub** command to submit your jobs.
The qsub submits the job into the queue. The qsub command creates a
request to the PBS Job manager for allocation of specified resources.
The **smallest allocation unit is entire node, 24 cores**, with
exception of the qexp queue. The resources will be allocated when
available, subject to allocation policies and constraints. **After the
resources are allocated the jobscript or interactive shell is executed
on first of the allocated nodes.**
Read more on the [Job submission and
execution](job-submission-and-execution.html) page.