Basic Current and Future Requests
The mshow command can report information on many aspects of the scheduling environment. To request information on available resources, the '-a' flag should be used. By default, the mshow command resource availability query only reports resources that are immediately available. To request information on specific resources, the type of resources required can be specified using the '-w' flag as in the following example:
To view current and future resource availability, the 'future flag should be set as in the following example:
Co-allocation Resources Queries
In many cases, a particular request will need simultaneous access to resources of different types. The mshow command supports a co-allocation request specified by using multiple '-w' arguments. For example, to request 16 nodes with feature fastcpu and 2 nodes with feature fastio, the following request might be used:
The mshow -a documentation contains a list of the different resources that may be queried as well as examples on using mshow.
Using Transaction IDs
By default, the mshow command reports simply when and where the requested resources are available. However, when the 'tid' flag is specified, the mshow command returns both resource availability information and a handle to these resources called a Transaction ID as in the following example:
In the preceding example, the returned transaction id (TID) may then be used to reserve the available resources using the mrsvctl -c -R command:
Where A1 is the hostlist, A2 is the duration, A3 is the starttime, A4 are any flags, and A5 are any features.
Using Reservation ProfilesReservation profiles (RSVPROFILE) stand as templates against which reservations can be created. They can contain a hostlist, startime, endtime, duration, access-control list, flags, triggers, variables, and most other attributes of an Administrative Reservation. The following example illustrates how to create a reservation with the exact same trigger-set.
To create a reservation with this profile the mrsvctl -c -P command is used:
Using Reservation Groups
Reservation groups are a way for Moab to tie reservations together. When a reservation is created using multiple Transaction IDs, these transactions and their resulting reservations are tied together into one group.
In the preceding example, these three reservations would be tied together into a single group. The mdiag -r command can be used to see which group a reservation belongs to. The mrsvctl -q diag -g command can also be used to print out a specific group of reservations. The mrsvctl -c -g command can also be used to release a group of reservations.
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