Hi,
Am 29.11.2007 um 14:14 schrieb amjad ali:
I want to develop and run my parallel code (MPI based) on a Beowulf
cluster. I have no problem as such that many user might log on to
the cluster simultaneously. Suppose that I am free to use cluster
dedicatedly for my single parallel application.
1) Do I really need a cluster scheduler installed on the cluster?
Should I use scheduler?
if you intend to manage all by hand: no. But it will ease the usage
of the cluster for your own, as it avoids that you have to look on
your own which nodes are free.
2) Is there any effect/benefit on the running of a parallel code
with or without cluster job scheduler?
It makes sense to install them even on a single machine, especially
if it has 4 cores: just to serialize your own workflow. This way you
can submit many jobs Friday evening, and all will be processed in a
controlled manner over the weekend.
3) How you differentiate between cluster scheduler and cluster
resource manager?
The scheduler will define the order of jobs to be executed (by a set
up policy) and put it on nodes according to the constraints of the
resource manger.
4) If there is any significant difference between a scheduler and
manager then plaese tell me that which of the fall in which category:
OpenPBS, PBS Professional, SGE, Maui, Moab, Torque, Scyld, LSF,
SLURM etc.
- Torque (as the successor of OpenPBS) is a DRM with has a FIFO
scheduling strategy.
If you have parallel jobs with a varying amount of processes, the
FIFO scheduler might not be good enough to avoid starvation of jobs
with a high request for cpus as always smaller jobs slip in.
- Maui is a scheduler which needs some DRM to work for.
- SGE is a DRM which has a capable scheduler already built-in.
5) What is maent by " PBS/SGE/LSF supports integration with the
Maui scheduler?
The built-in scheduler of these can be replaced by Maui (which is
only a scheduler). But in the clusters I saw which do it, I found it
always confusing to have a "qstat" command from e.g. Torque, and a
"showq" from Maui. At least for SGE I would suggest to stay with the
already built-in one.
-- Reuti
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