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The spool directory for each execd is the greatest source of NFS traffic for Grid Engine. When jobs are dispatched to an exec host, the job script gets transferred via the commd and then written to the spool directory. Each job gets its own subdirectory, into which additional information is written by both the execd and the job shepherd process. Logfiles are also written into the spool directory, for both the execd as well as the individual jobs.
By configuring local spool directories, all that traffic can be redirected to the local disk on each compute host, thus isolating it from the rest of the network as well as reducing the I/O latency. One disadvantage is that, in order to view the logfiles for a particular job, you need to log onto the system where the job ran, instead of simply looking in the shared directory. But, this would only be necessary for detailed debugging of a job problem.
The path to the spool directory controlled by the parameter execd_spool_dir;
it should be set to a directory on the local compute host which is owned by the
admin user and which ideally can handle intensive reading/writing (e.g., /var/spool/sge).
The execd_spool_dir parameter can be specified when running the install_qmaster script. However, this directory must already existed and be owned by the admin user, or else the script will complain and the execd will not function properly. Alternatively, the execd_spool_dir parameter can be changed in the cluster configuration (man sge_conf); the execds need to be halted before this change can be made. Please make you read sge_conf(5)
The path to the spool directory controlled by the parameter execd_spool_dir; it should be set to a directory on the local compute host which is owned by the admin user and which ideally can handle intensive reading/writing (e.g., /var/spool/sge). The execd_spool_dir parameter can be specified when running the install_qmaster script. However, this directory must already existed and be owned by the admin user, or else the script will complain and the execd will not function properly. Alternatively, the execd_spool_dir parameter can be changed in the cluster configuration (man sge_conf); the execds need to be halted before this change can be made. Please make you read sge_conf(5)
To change execd_spool_dir to, say, /var/spool/sge you need to perform the following steps:
mkdir -p /var/spool/sge/`hostname`/active_jobs
chown -R sge:sge /var/spool/sge # if SGE is installed not as root, but as sge
$SGE_ROOT/$SGE_CELL/default/common/sgeexecd start
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