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If you are facing this issue “Unable to determine user account for execution;”, it is likely casued by the fact that LSF cluster must be restarted if user authentication is switched from NIS to LDAP.
After user authentication method is switched from NIS to LDAP, all user jobs are pending with the pending reason: “Unable to determine user account for execution”.
If user authentication mode is changed, you have to restart LSF daemons on all LSF hosts for jobs to run successfully. On the LSF master master host do:
# lsadmin reconfig # badmin mbdrestart # badmin hrestart all
Platform LSF allowed you to pack or spread jobs as required. Before that, just a few terms to defined
- Packing means always placing jobs on the hosts with the least available slots first. Packing jobs can make room for bigger parallel jobs.
- Spreading tries to spread jobs out and places jobs on the hosts with the most available slots first. Spreading jobs maximizes the performance of individual jobs.
I will deal with one situation where I want to pack all the serial jobs neatly in as few nodes as possible.
But here are some terms from the LSF Wiki
The slots keyword represents available slots on each host and it is a built-in numeric decreasing resource. When a job occupies some of the job slots on the host, the slots resource value is decreased accordingly. For example, if MXJ of an LSF host is defined as 8, the slots value will be 8 when the host is empty. When 6 LSF job slots have been occupied, slots becomes 2. The slots resource can only be used in select and order sections of a job resource requirement string. To apply a job packing or spreading policy, you can use the order section in the job resource requirement. For example, -R “order[-slots]” will order candidate hosts based on the least available slots, while –R “order[slots]” will order candidate hosts based on the hosts with the most available slots.
To use ! in an order clause, you must set SCHED_PER_JOB_SORT=Y in lsb.params. To make the parameter take effect, run badmin mbdrestart or badmin reconfig on the master host to reconfigure mbatchd.
The following is an example of using the slots resource:
Step 1: Configure RES_REQ in a Queue section of lsb.queues.
Begin Queue QUEUE_NAME = myqueue … RES_REQ = order[-slots] … End Queue
Step 2: Make the configuration take effects
# badmin reconfig
Step 3: Check whether the configuration take effects.
# bqueues -l myqueue QUEUE: myqueue … RES_REQ: order[-slots]
You can also do it at the application level. For more information, please read the PLatfrom LSF Wiki
To setup Secondary Master Host on Platform LSF can be very easy.
Step 1: Update the LSF_MASTER_LIST parameter in lsf.conf by updating the current master host
# cd $LSF_ENVDIR # vim lsf.conf
At line 114
..... LSF_MASTER_LIST="h00 h01" .....
If you wish to switch the order of Master Host for maintenance, it can be done as well
Step 2: Reconfigure the cluster and restart the LSF mbatchd and mbschd processes
# lsadmin reconfig # badmin mbdrestart
Step 3: Update the master_hosts in lsb.hosts
# cd $LSF_ENVDIR/lsbatch/yourhpclcuster/configdir/configdir # vim lsb.hosts
Begin HostGroup GROUP_NAME GROUP_MEMBER #GROUP_ADMIN # Key words master_hosts (h00 h01) End HostGroup
Using a Pseudo-terminal to launch Interactive Job
Point 1: Submit a batch interactive job using a pseudo-terminal.
$ bsub -Ip vim output.log
Submits a batch interactive job to edit output.log.
Point 2: Submit a batch interactive job and create a pseudo-terminal with shell mode support.
$ bsub -Is bash
Submits a batch interactive job that starts up bash as an interactive shell.
When you specify the -Is option, bsub submits a batch interactive job and creates a pseudo-terminal with shell mode support when the job starts.
This refers to Parallel job abnormal task exit
This article is taken from Cleaning up Platform LSF parallel job execution problems
- Define an application profile in lsb.applications:
NAME = myApp
DESCRIPTION = Application profile example
- Run badmin reconfig as LSF administrator to make the configuration take effect.
- Submit an MPICH2 job with –app myApp:
$ bsub –app myApp –n4 –R “span[ptile=2]” mpiexec.hydra ./cpi
- Cleaning up parallel job execution problems
- Cleaning up Platform LSF parallel Job Execution Problems – Part 1
- Cleaning up Platform LSF parallel Job Execution Problems – Part 2
- Cleaning up Platform LSF parallel Job Execution Problems – Part 3
There is a useful link Common LSF problems whichI find very helpful in troubleshooting