Yes, yo are right, I do not understand what --ntasks means and
when to use it or --ntasks-per-node
I assumed it meant " n tasks " for the job, in my case, 2 tasks for
this job, running on 1 node with 1 cpu per task, which would make it 1
nodes/2 cpu allocation.
As for the "default is one task per node" : when using --nodes=1 I get
an allocation of 1 node/ 8 cpus :
NumNodes=1 NumCPUs=8 CPUs/Task=1
so I get a default of 1 task per cpu, not one task per node.
Thanks for your help,
Eva
On Tue, 23 Sep 2014, Trey Dockendorf wrote:
>
> Eva,
>
> I think your misunderstanding the purpose and default behavior of "--ntasks".
>
> If you read the last sentence of the description for --ntasks - "The default
> is one task per node".
>
> So from your first email, using "--nodes=1-1 --ntasks=2 --cpus-per-task=1"
> will not work. Your asking for 2 tasks and a max of one node, and the
> default for number of tasks is one per node (see quote above). If you just
> said "--nodes=1" then that may work since your max was undefined and as the
> docs mention for --nodes, the job will be allocated enough nodes to satisfy
> your number of tasks.
>
> Those options work just fine, and as expected, in 14.03.3 up to 14.03.6
> (versions I've used in past months).
>
> - Trey
>
> =============================
>
> Trey Dockendorf
> Systems Analyst I
> Texas A&M University
> Academy for Advanced Telecommunications and Learning Technologies
> Phone: (979)458-2396
> Email: [email protected]
> Jabber: [email protected]
>
> ----- Original Message -----
> > From: "Eva Hocks" <[email protected]>
> > To: "slurm-dev" <[email protected]>
> > Sent: Tuesday, September 23, 2014 5:59:28 PM
> > Subject: [slurm-dev] Re: Requested node configuration is not available
> >
> >
> >
> >
> >
> >
> >
> > I found
> >
> >
> > #SBATCH --ntasks-per-node=2
> >
> > and now the job runs with NumNodes=1-1 NumCPUs=2 CPUs/Task=2
> >
> >
> > The docu on www.schedmd.com/slurmdocs/sbatch.html
> >
> > shows
> >
> > -n, --ntasks ......
> >
> >
> > Is this flag still working for job steps to run within the allocation
> > will launch a maximum of "number" tasks ? Doesn't look like it.
> >
> > Thanks
> > Eva
> >
> >
> > On Tue, 23 Sep 2014, Eva Hocks wrote:
> >
> > >
> > >
> > >
> > >
> > > If I use
> > >
> > > #SBATCH -N 1-1
> > > #SBATCH -c 2 the job starts and uses
> > >
> > > NumNodes=1 NumCPUs=8 CPUs/Task=2
> > >
> > >
> > > Eva
> > >
> > >
> > >
> > > On Tue, 23 Sep 2014, Eva Hocks wrote:
> > >
> > > >
> > > >
> > > >
> > > >
> > > > slurm Version=14.03:
> > > >
> > > > I am trying to run a simple job with
> > > >
> > > > #SBATCH --nodes=1-1
> > > > #SBATCH --ntasks=2
> > > > #SBATCH --cpus-per-task=1
> > > >
> > > > on a test cluster with 2 nodes both configured:
> > > > CPUAlloc=0 CPUErr=0 CPUTot=8
> > > >
> > > > but whenever I try sbatch it refuses: Requested node
> > > > configuration is
> > > > not available. The nodes have 8 CPUs configured so why can't I
> > > > run a 2
> > > > task job on 2 of those CPUs? I can run a 1 task job or if I don't
> > > > include the ntasks I get by default 8 tasks, that works. But I
> > > > cannot
> > > > specify anything >1 task. sbatch --verbose isn't very helpful.
> > > > The slurm
> > > > log has:
> > > >
> > > >
> > > > [2014-09-23T14:58:03.834] cons_res: cr_job_test: evaluating job
> > > > 152 on 3 nodes
> > > > [2014-09-23T14:58:03.834] cons_res: _can_job_run_on_node: 8 cpus
> > > > on hpc-0-4(1), mem 0/24151
> > > > [2014-09-23T14:58:03.834] cons_res: _can_job_run_on_node: 8 cpus
> > > > on hpc-0-5(0), mem 0/24151
> > > > [2014-09-23T14:58:03.834] cons_res: _can_job_run_on_node: 8 cpus
> > > > on hpc-0-6(1), mem 0/24151
> > > > [2014-09-23T14:58:03.834] cons_res: eval_nodes:0 consec c=24 n=3
> > > > b=0 e=2 r=-1
> > > > [2014-09-23T14:58:03.834] cons_res: cr_job_test: test 0 fail:
> > > > insufficient resources
> > > > [2014-09-23T14:58:03.834] no job_resources info for job 152 rc=-1
> > > > [2014-09-23T14:58:03.834] _pick_best_nodes: job 152 never
> > > > runnable
> > > > [2014-09-23T14:58:03.835] _slurm_rpc_submit_batch_job: Requested
> > > > node configuration is not available
> > > >
> > > >
> > > >
> > > > and scontrol shows the job with
> > > > JobState=FAILED Reason=BadConstraints
> > > > NumNodes=1 NumCPUs=2 CPUs/Task=1
> > > >
> > > >
> > > > BTW mysql is running and I can with no problem connect to the
> > > > server
> > > > manually.
> > > >
> > > >
> > > > Any insight how to run a 1 node/2CPU job in slurm?
> > > >
> > > >
> > > > Thanks
> > > > Eva
> > > >
> > >
> > >
> >
>
