Difference between revisions of "Example Build of an ARC/Condor Cluster"
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Revision as of 09:52, 11 September 2014
Contents
Introduction
A multi-core job is one which needs to use more than one processor on a node. Until recently, multi-core jobs have not been used much on the grid infrastructure. This has all changed because Atlas and other large users have now asked sites to enable multi-core on their clusters.
Unfortunately, it is not just a simple task of setting some parameter on the head node and sitting back while jobs arrive. Different grid system have varying levels of support for multi-core, ranging from non-existent to virtually full support.
This report discusses the multi-core configuration at Liverpool. We decided to build a test cluster using one of the most capable batch systems currently available, called HTCondor (or condor for short). We also decided to front the system with an ARC/Condor CE.
I should Andrew Lahiff at RAL for the initial configuration and many suggestions and help.
Infrastructure/Fabric
The multicore test cluster consists of an SL6 headnode to run the ARC CE and the Condor batch system. The headnode has a dedicated set of N workernodes of various types, providing a total of 96 single threads of execution.
Head Node
The headnode is a virtual system running on KVM.
| Host Name | OS | CPUs | RAM | Disk Space
|
|---|---|---|---|---|
| hepgrid2.ph.liv.ac.uk | SL6.4 | 1 | 2 gig | 35 gig |
Worker nodes
The physical workernodes are described below.
| Node names | CPU type | OS | RAM | Disk Space | CPUs Per Node | Slots used per cpu | Slots used per node | Total nodes | Total CPUs | Total slots | HepSpec per slot | Total hepspec
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| r21-n01 to n04 | E5620 | SL6.4 | 24 GB | 1.5 TB | 2 | 5 | 10 | 4 | 8 | 40 | 12.05 | 482 |
| r26-n05 to n11 | L5420 | SL6.4 | 16 GB | 1.7 TB | 2 | 4 | 8 | 7 | 14 | 56 | 8.86 | 502
|
Software Builds and Configuration
There are a few particulars of the Liverpool site that I want to get out of the way to start with. For the initial installation of an operating system on our head nodes and worker nodes, we use tools developed at Liverpool (BuildTools) based on Kickstart, NFS, TFTP and DHCP. The source (synctool.pl and linktool.pl) can be obtained from sjones@hep.ph.liv.ac.uk. Alternatively, similar functionality is said to exist in the Cobler suite, which is released as Open Source and some sites have based their initial install on that. Once the OS is on, the first reboot starts Puppet to give a personality to the node. Puppet is becoming something of a defacto standard in its own right, so I'll use puppet terminology within this document where some explanation of a particular feature is needed.
Special Software Control Measures
The software for the installation is all contained in various yum repositories. Here at Liverpool, we maintain two mirrored copies of the yum material. Once of them, the online repository, is mirrored daily from the internet. It is not used for any installation. The other copy, termed the local repository, is used to take a snapshot when necessary of the online respository. Installations are done from the local reposistory. Thus we maintain precise control of the software we use.
We'll start with the headnode and "work down" so to speak.
Head Node
Yum repos
Notwiststanding the special measures at Liverpool for software control, this table shows the origin of the software release via yum repositories.
Standard build
The basis for the initial build follows the standard model for any grid node at Liverpool. I won't explain that in detail – each site is likely to have its own standard, which is general all the components used to build any grid noide (such as a CE, ARGUS, BDII, TORQUE etc.) but prior to any middleware.
Additional Packages
These packages were needed to add the middleware reqwuired, i.e. Arc, Condor and ancilliary material.
| Package | Description |
|---|---|
| nordugrid-arc-compute-element | The ARC CE Middleware |
| condor | HT Condor, the main batch server package |
| apel-client | Accounting, ARC/Condor bypasses the APEL server and goes direct.
|
| ca_policy_igtf-classic | Certificates |
| lcas-plugins-basic | Security |
| lcas-plugins-voms | Security |
| lcas | Security |
| lcmaps | Security |
| lcmaps-plugins-basic | Security |
| lcmaps-plugins-c-pep | Security |
| lcmaps-plugins-verify-proxy | Security |
| lcmaps-plugins-voms | Security
|
| globus-ftp-control | Extra packages for Globus |
| globus-gsi-callback | Extra packages for Globus
|
| VomsSnooper | VOMS Helper, used to set up the LSC (list of Certificates) files |
| glite-yaim-core | Yaim,just use Yaim to make accounts. |
| yum-plugin-priorities.noarch | Helpers for Yum |
| yum-plugin-protectbase.noarch | Helpers for Yum |
| yum-utils | Helpers for Yum |
Special notes
After installing the Apel package, I had to make these chnages bu hand. On line 136 of the /usr/libexec/arc/ssmsend file, I had to add a parameter ; use_ssl = _use_ssl.
Worker Node
sdfsd
Performance/Tuning
fsd
