Thanks for the good explanation.
You happened to brought up my another question -- you said '
For a parallel job you will need to request more than one slot by a parallel
environment (PE) depending on the job requirements.
'
We have a multithreaded java app that at the most uses 4 cores on a
single node. Do I need a PE for it? If yes, can you give an example?
Thanks again!
Fan
On 05/04/2013 4:41 PM, Reuti wrote:
Hi,
Am 05.04.2013 um 22:21 schrieb Fan Dong:
Maybe someone here can clarify the concept of slots for me. I am very much confused by
the definition "The maximum number of concurrently executing jobs allowed in the
queue. Type is number, valid values are 0 to 9999999.".
Is the queue here cluster queue or queue instance? In my particular setting,
the host group @allhosts contains 4 hosts and 28 CPU in total. Run 'qconf -sq
all.q', giving the following by the default. The slots is 1 -- what does it
really mean?
Does that mean 1 active job per queue instance?
Yes, in detail: one serial job. You could phrase it also "slots" = "allowed user
processes" per queue instance, often set to the number of available cores in an exechost. For
a parallel job you will need to request more than one slot by a parallel environment (PE) depending
on the job requirements.
I have 4 queue instances and at the most I can have 4 jobs running
concurrently? I am really not sure....
qname all.q
hostlist @allhosts
seq_no 0
load_thresholds np_load_avg=1.75
suspend_thresholds NONE
nsuspend 1
suspend_interval 00:05:00
priority 0
min_cpu_interval 00:05:00
processors UNDEFINED
qtype BATCH INTERACTIVE
ckpt_list NONE
pe_list make
rerun FALSE
slots 1,[comp01=6],[comp02=6], [comp03=8],[comp04=8]
1 is the default for queue instances not listed after it. I.e. if you have an
uniform cluster where each machine has 16 cores one could write:
$ qconf -sq all.q
...
slots 16
Nevertheless:
$ qconf -sq all.q
...
slots 42,[@allhosts=16]
would result in the same slot count when all hosts are listed in the hostgroup
@allhosts.
-- Reuti
_______________________________________________
users mailing list
[email protected]
https://gridengine.org/mailman/listinfo/users
_______________________________________________
users mailing list
[email protected]
https://gridengine.org/mailman/listinfo/users
