Specifying Maximum and Minimum Walltime in Torque
Specifying Maximum and Minimum Walltime in the queue or globally within the Torque configuration is important or you have users who uses without restraint. At Torque Server, you can set maximum...
View ArticleDiagnostic Tools to diagnose Infiniband Device
There are a few Diagnostic Tools to diagnose Infiniband Devices.ibv_devinfo (Query RDMA devices)ibstat (Query basic status of InfiniBand device(s))ibstatus (Query basic status of InfiniBand...
View ArticleUnable to SSH due to failure of authentication with GSSAPI
I have a very slow or failed ssh connection due to failure with authentication with GSSAPI. See below my error.....debug1: Authentications that can continue: publickey,gssapi-with-mic,passworddebug1:...
View ArticleData ONTAP Cluster-Mode Vsim Tutorial
10 steps to a 2-node Data ONTAP 8.1.1 Cluster-Mode Vsim cluster. See https://www.youtube.com/watch?feature=player_embedded&v=prEf5J0wvi0
View ArticleUnable to restart pbs_mom on nodes
I was unable to restart the pbs_mom from one of the compute node. A look at the log file at /var/spool/torque/mom_logs shows # less /var/spool/torque/mom_logspbs_mom;Svr;pbs_mom;LOG_ERROR::pbs_mom,...
View ArticleGeneral run-time tuning for Open MPI 1.4 and later (Part1)
Taken from 17. How do I tell Open MPI to use processor and/or memory affinity in Open MPI v1.4.x? (How do I use the –by* and –bind-to-* options?) During the mpirun, you can put in the parameter of the...
View ArticleUseful Repositories for CentOS 5
RPMForge - This repository is a collaboration of Dag i386 # wgethttp://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el5.rf.i386.rpmx86_64 #...
View ArticleDisplay information about the Open MPI installation - ompi_info
ompi_info provides detailed information about the Open MPI installation. It is useful for checking local configuration and seeing how Open MPI was installed and listing of installed Open MPI Plugins...
View ArticleHandling inputs flies on PBS
The writeup on linuxcluster "Handling inputs flies on PBS" shows how you can handle inputs files on PBS both on Single Input File (Serial Run) and Multiple Input Files (Serial Run).Do read
View ArticleShow Start Estimate for MAUI
The reference is taken from showstart reference from MOAB Workload ManagerThis command displays the estimated start time of a job. Since MAUI is a free basic version of MOAB, from what I know, we do...
View ArticleInstalling PHP 5.4 on CentOS 5
First thing first, install the Repository as listed in Useful Repositories for CentOS 5 especiallyIUS Community Repository.Once you have installed repositories, do the following# yum install php54...
View ArticleDisplaying Repository List with yum
If you wish to display a list of configured repositories which are enabled, you can use the command # yum repolistrepo id repo name statusepel...
View ArticleError when yum install ganglia on CentOS 5.8
I was doing a yum install of Ganglia on CentOS 5.8, # yum install php rrdtool ganglia ganglia-gmetad ganglia-gmond ganglia-web httpdI got the error as below. ganglia-web-3.1.7-3.el5.rf.x86_64 from...
View ArticleRunning OpenMPI in oversubscribe nodes
Taken from OpenMPI FAQ 21. Can I oversubscribe nodes (run more processes than processors)? Open MPI basically runs its message passing progression engine in two modes: aggressive and...
View ArticleSingCERT Alerts - SPAM Emails from Yahoo Accounts
The Singapore Computer Emergency Response Team (SingCERT) has received reports of spam emails from Yahoo! accounts containing links to websites selling “work from home” schemes and packages.The spam...
View ArticleFinding the user who used excessive memory and crash the Server
Using linux tools, we can quickly deduce the users who have crashed the system. For me, one of the harder to trace are researchers who run large memory arrays. And if the array is not calculated...
View Articlexrdp_mm_process_login_response: login failed
If you encountered this error xrdp_mm_process_login_response: login failed when you use the remote desktop connection to connection to a vnc session. Even if you restart xrdp, the error still remain,...
View ArticleSequential execution of the Parallel or serial jobs on OpenPBS / Torque
If you have an requirement to execute jobs in sequence after the 1st job has completed, only then the 2nd job can launch, you can use the -W command For example, if you have a running job with a job ID...
View ArticleUsing iostat to report system input and output
The iostat command is used to monitor system input/output device loading by observing the time the device are active in relation to their average transfer rate.# iostat -m 2 10 -x /dev/sda1avg-cpu:...
View ArticleRunning Linpack (HPL) Test on Linux Cluster with OpenMPI and Intel Compilers
HPL is a software package that solves a (random) dense linear system in double precision (64 bits) arithmetic on distributed-memory computers. It can thus be regarded as a portable as well as freely...
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