Hp XC System 2.x Software Manuel d'utilisateur télécharger pdf (Page 80)

Yo u can use a parameterized "format string" to systematically generate unique n ames for

(usually) multiple I/O files, each of which receives some job I/O depending on the naming

scheme that you choose. You can subdivide the received I/O into separate files by job ID,

step ID , node (name or sequence number), or individual task. In each case, srun opens the

appropriate number of files and associates each with the appropriate subset of tasks.

Available parameters with which to construct the format string, and thereby to split the I/O

among separate files, include the following:

(uppercase) Creates one file for each job ID/step ID combination for this running

job, and embeds jobid.stepid in each file’s name (for example, out%J

might yield files out4812.0, out4812.1, a nd so on).

%j Creates one file for each job ID, and em beds jobid in its name (for example,

job%j might yield file job4812).

Creates one file for each step ID, and embeds stepid in its name (for example,

step%s.out would yield files step0.out, step1.out, a nd so on).

Creates one file for each node on which this job runs, and embeds that node’s

short hostname in the file name (for example, node.%N might yield files

node.mcr347, node.mcr348, and so on).

Creates one file for each node on which this job runs, and embeds that node’s

numerical identifier r elative to the job (where the each job’s first node is 0, then

1,andsoon)inthefilename(forexample,node%n would yield files node0,

node1,andsoon).

Creates one file for each separate task in this running job, and embeds that

task’s numerical identifier relative to the job (the first task is 0) in the file

name (for example, job%j-%t.out might yield files job4812-0.out,

job4812-1.out, and so on).

For all format string parameters except the nonnumeric case of %N, you can insert an integer

between the percent character and the letter (such as %3t) to "zero-pad" the r esu lting file names,

that is, to always use the integer number of character positions and to fill any empty positions

with zeros f ro m the left. Thus job%j-%3t.out might yield files job4812-000.out

and job4812-001.out.

6.4.7 srun Constraint Options

The srun con straint options limit the nodes on which y our job will execute to only those nodes

having the properties (constraints) that you specify. The following constraints are available:

-C clist (--constraint=clist)

The -C option runs y our job on those nodes having the properties in clist, where clist is a list of

features assigned for this purpose by SLURM system administrators (the features may vary

by network or machine).

To conjoin (AN D) multiple constraints, separate them in clist by using a comma (c1,c2).

To disjoin (OR) multiple constraints, separate them in c list b y using a v ertical bar (c3|c4).

If no nodes have the feature(s) that you require with -C, then the SLURM job manager will

reject your job.

6-10 Using SLURM

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Hp XC System 2.x Software Manuel d'utilisateur Page 80