Commit 261c2a1a authored by Leigh Stoller's avatar Leigh Stoller

Lets make it easier to manage pre reservations (Mike, this was Rob's


New script and table to manage node pre reservations. Lets just look
at the script.

To create a reservation:

    myboss> wap prereserve -t pc850 testbed 2
    Node reservation request for 2 nodes has been created.

To see the reservation status for testbed

    myboss> wap prereserve -i testbed
    Project         Cnt (Cur)  Creator    When               Pri Types
    testbed         1 (1)      stoller    2011-08-12 12:39:07 0   pc850

    which says 1 node is pending and 1 node has already been

To clear the above reservation request (and optionally, clean
reserved_pid from the nodes table).

    myboss> wap prereserve -c -r testbed

    The -r is optional, otherwise just the reservation request is
    cleared, and nodes continue to be pre-reserved to the project.

To see a list of all reservation requests:

    myboss> wap prereserve -l

So, when a node is released in nfree, we look at the reservation
status for the node and any pending reservation requests.

1. If the node has a reserved_pid and that request is still pending
   (still in the table), nothing is changed.

2. If the node has a reserved_pid, but the request has been cleared
   from the pending table, then clear reserved_pid.

3. If reserved_pid is null, and there are pending requests, then pick
   the highest priority, most recent dated, request, and set
   reserved_pid to that project.


* -n <pri> - is how you set a priority. Lowest is zero, choose a
  higher number if you want this reservation request to be considered
  before others. In a tie, look at the date of creation, and use the

* -t <typelist> - a comma separated list of types you want to
  consider. Types are considered in order, but not in the fancy way
  you might imagine.
parent 02f94859
......@@ -313,7 +313,7 @@ foreach my $type (@types) {
DBQueryFatal("unlock tables");
if ($current >= $count) {
print "Got as many nodes as you wanted the free pool. Yippie!\n";
print "Got as many nodes as you wanted from the free pool. Yippie!\n";
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