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## Maui Scheduler Integration Guide

### Overview

Maui configuration is quite complicated and is really beyond the scope of any documents we could supply with SLURM. We don't intend SLURM to be a "wrapper" for Maui, or to subordinate Maui. The best (and practically only) resource for configuration Maui is the online documents at the site of Maui's developers: http://www.clusterresources.com/products/maui/docs/mauiadmin.shtml.

### Configuration

First, download the Maui scheduler kit from their web site http://www.clusterresources.com/products/maui. Note: maui-3.2.6p9 has been validated with SLURM, other versions should also work properly.

Make sure that SLURM is installed and running before building Maui. Then build Maui from its source distribution. This is a two step process:

1. ./configure --with-key=42 --with-wiki
2. gmake

The key of 42 is arbitrary. You can use any value, but will need to specify the same value as a SLURM configuration parameter.

Update the Maui configuration file maui.conf (Copy the file maui-3.2.6p9/maui.cfg.dist to maui.conf). Add the following configuration paramters to maui.conf:

    RMCFG[host]       TYPE=WIKI
    RMPORT            7321            # or whatever you choose as a port
    RMHOST            host
    RMAUTHTYPE[host]  NONE

host is the hostname where the SLURM controller is running. This must match the value of ControlMachine configured in slurm.conf. Note that localhost doesn't work. If you run Maui and SLURM on the same machine, you must specify the actual host name. The above example uses a TCP port number of 7321 for communications between SLURM and Maui, but you can pick any port that is available and accessible. You can also set a polling interval with

    RMPOLLINTERVAL  00:00:20

I like Maui to poll SLURM quite often -- in this case every 20 seconds. Note that a job submitted to an idle cluster will not be initiated until the Maui daemon polls SLURM and decides to make it run, so the value of RMPOLLINTERVAL should be set to a value appropriate for your site considering both the desired system responsiveness and the overhead of executing Maui daemons too frequently.

In order for Maui to be able to access your SLURM partition, you will need to define in maui.conf a partition with the same name as the SLURM partition(s). For example if nodes "linux[0-3]" are in SLURM partition "PartA", slurm.conf includes a line of this sort:

    PartitionName=PartA Default=yes Nodes=linux[0-3]

The add the corresponding lines to maui.cfg:

    PARTITIONMODE ON
    NODECFG[linux0]   PARTITION=PartA
    NODECFG[linux1]   PARTITION=PartA
    NODECFG[linux2]   PARTITION=PartA
    NODECFG[linux3]   PARTITION=PartA

Set the slurm.conf scheduler parameters as follows:

    SchedulerType=sched/wiki
    SchedulerPort=7321
    SchedulerAuth=42

In this case, "SchedulerAuth" has been set to 42, which was the key specified when Maui was configured above. Just make sure the numbers match. The Maui folks have assured me that the key won't always be a compiled-in feature.

Set the following environment variables and path:

    set path=(/root/MAUI/maui-3.2.6p9/bin $path)
    setenv MAUIHOMEDIR /root/MAUI/maui-3.2.6p9

For information about this page, contact slurm-dev@lists.llnl.gov.