Moab Workload Manager

mshow -a

(Moab Show Available Resources)

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:

> mshow -a -w taskmem=1500,duration=600 ...

To view current and future resource availability, the 'future flag should be set as in the following example: > mshow -a -w taskmem=1500,duration=600 --flags=future ...

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:

> mshow -a -w minprocs=16,duration=1:00:00,nodefeature=fastcpu -w minprocs=2,nodefeature=fastio,duration=1:00:00 --flags=future

Partition     Procs  Nodes   StartOffset      Duration       StartDate
---------     -----  -----  ------------  ------------  --------------
ALL              16      8      00:00:00       1:00:00  13:00:18_08/25  ReqID=0
ALL               2      1      00:00:00       1:00:00  13:00:18_08/25  ReqID=1

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:

> mshow -a -w minprocs=16,nodefeature=fastcpu,duration=2:00:00 --flags=future,tid

Partition     Procs  Nodes   StartOffset      Duration       StartDate
---------     -----  -----  ------------  ------------  --------------
ALL              16     16      00:00:00       2:00:00  13:00:18_08/25  TID=26 ReqID=0

In the preceding example, the returned transaction id (TID) may then be used to reserve the available resources using the mrsvctl -c -R command:

> mrsvctl -c -R 26

reservation system.1 successfully created

Any TID can be printed out using the mschedctl -l trans command:

> mschedctl -l trans 26

TID[26]  A1='node01'  A2='600'  A3='1093465728'  A4='ADVRES'  A5='fastio'

Where A1 is the hostlist, A2 is the duration, A3 is the starttime, A4 are any flags, and A5 are any features.

Using Reservation Profiles

Reservation 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.

# moab.cfg

RSVPROFILE[test1] TRIGGER=Sets=$Var1.$Var2.$Var3.!Net,EType=start,AType=exec,Action=/tmp/host/triggers/,Timeout=1:00:00
RSVPROFILE[test1] TRIGGER=Requires=$Var1.$Var2.$Var3,Sets=$Var4.$Var5,EType=start,AType=exec,Action=/tmp/host/triggers/$Var1:$Var2:$Var3,Timeout=20:00
RSVPROFILE[test1] TRIGGER=Requires=$Var1.$Var2.$Var3.$Var4.$Var5,Sets=!NOOSinit.OSinit,Etype=start,AType=exec,Action=/tmp/host/triggers/$Var1:$Var2:$Var3:$Var4:$Var5
RSVPROFILE[test1] TRIGGER=Requires=NOOSini,AType=cancel,EType=start
RSVPROFILE[test1] TRIGGER=EType=start,Requires=OSinit,AType=exec,Action=/tmp/host/triggers/

To create a reservation with this profile the mrsvctl -c -P command is used:

> mrsvctl -c -P test1

reservation system.1 successfully created

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.

> mrsvctl -c -R 34,35,36

reservation system.99 successfully created
reservation system.100 successfully created
reservation system.101 successfully created

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.

See Also