Hi,
When running MTT on the Cray XT3/XT4 machines, I found that MTT
does not
contain any support for ALPS. As a result, it always executes mpirun
with "-np 1". I patched lib/MTT/Values/Functions.pm with the
following
to overcome this:
-----Original Message-----
From: Matney Sr, Kenneth D.
Sent: Wednesday, August 13, 2008 5:57 PM
To: Shipman, Galen M.
Cc: Graham, Richard L.
Subject: FW: ALPS modifications for MTT
--- Functions-bak.pm 2008-08-06 14:31:26.256538000 -0400
+++ Functions.pm 2008-08-13 17:43:40.273641000 -0400
@@ -602,6 +602,8 @@
# Resource managers
return "SLURM"
if slurm_job();
+ return "ALPS"
+ if alps_job();
return "TM"
if pbs_job();
return "N1GE"
@@ -638,6 +640,8 @@
# Resource managers
return slurm_max_procs()
if slurm_job();
+ return alps_max_procs()
+ if alps_job();
return pbs_max_procs()
if pbs_job();
return n1ge_max_procs()
@@ -670,6 +674,8 @@
# Resource managers
return slurm_hosts()
if slurm_job();
+ return alps_hosts()
+ if alps_job();
return pbs_hosts()
if pbs_job();
return n1ge_hosts()
@@ -1004,6 +1010,70 @@
#-----------------------------------------------------------------------
---
+# Return "1" if we're running in an ALPS job; "0" otherwise.
+sub alps_job {
+ Debug("&alps_job\n");
+
+# It is true that ALPS can be run in an interactive access mode;
however,
+# this would not be a true managed environment. Such only can be
+# achieved under a batch scheduler.
+ return ((exists($ENV{BATCH_PARTITION_ID}) &&
+ exists($ENV{PBS_NNODES})) ? "1" : "0");
+}
+
+
#----------------------------------------------------------------------
----
+
+# If in an ALPS job, return the max number of processes we can run.
+# Otherwise, return 0.
+sub alps_max_procs {
+ Debug("&alps_max_procs\n");
+
+ return "0"
+ if (!alps_job());
+
+# If we were not running under PBS or some other batch system, we
would
+# not have the foggiest idea of how many processes mpirun could
spawn.
+ my $ret;
+ $ret=$ENV{PBS_NNODES};
+
+ Debug("&alps_max_procs returning: $ret\n");
+ return "$ret";
+}
+
+
#----------------------------------------------------------------------
----
+
+# If in an ALPS job, return the hosts we can run on. Otherwise,
return
+# "".
+sub alps_hosts {
+ Debug("&alps_hosts\n");
+
+ return ""
+ if (!alps_job());
+
+# Again, we need a batch system to achieve management; return the
uniq'ed
+# contents of $PBS_HOSTFILE. Actually, on the Cray XT, we can
return
the
+# NIDS allocated by ALPS; but, without launching servers to other
service
+# nodes, all communication is via the launching node and NIDS
actually
+# have no persistent resource allocated to the user. That is, all
file
+# resources accessible from a NID are shared with the launching
node.
+# And, since ALPS is managed by the batch system, only the
launching
node
+# can initiate communication with a NID. In effect, the Cray XT
model is
+# of a single service node with a varying number of compute
processors.
+ open (FILE, $ENV{PBS_NODEFILE}) || return "";
+ my $lines;
+ while (<FILE>) {
+ chomp;
+ $lines->{$_} = 1;
+ }
+
+ my @hosts = sort(keys(%$lines));
+ my $hosts = join(",", @hosts);
+ Debug("&alps_hosts returning: $hosts\n");
+ return "$hosts";
+}
+
+
#----------------------------------------------------------------------
----
+
# Return "1" if we're running in a PBS job; "0" otherwise.
sub pbs_job {
Debug("&pbs_job\n");
--
Ken
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