Opened 12 years ago

Closed 9 years ago

Last modified 4 years ago

#447 closed Bug (wontfix)

IOF and cutting along latitude

Reported by: ebehrens Owned by: nemo
Priority: high Milestone:
Component: OCE Version: release-3.1
Severity: Keywords: IOF OFF
Cc: Branch review:
MP ready?: Task progress:

Description

We performed following experiments of NEMO 3.1 on NEC SX9:

-IOF 4x1 PE, 1215 timesteps (CPU TIME = 2667.269 sec.)

-IOF 1x4 PE, 1215 timesteps (CPU TIME = ) FAILED!!!

-OFFLINE 4x1 PE, 1215 timesteps (CPU TIME = 2661.805 sec )

-OFFLINE 1x4 PE, 1215 timesteps (CPU TIME = 1615.761 sec. )

The experiment with IOF and 1x4 failed with following error:

252 Floating-point zero divide PROG=sbcblk_core.psi_h ELN=29(4001fcd08)

Maybe their is a problem with IOF and extra halos and/or a SX9 specific problem. We can not profit from the performance of "latitude cutting" (1x4) and IOF, which would improve the performance (see http://forge.ipsl.jussieu.fr/nemo/ticket/445).

Commit History (0)

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Change History (7)

comment:1 in reply to: ↑ description ; follow-up: Changed 12 years ago by ebehrens

PS: It's ORCA05.

comment:2 in reply to: ↑ 1 Changed 12 years ago by ebehrens

I performed a further run with IOF and 1x3 and overlap in j of 2 grid cells to avoid any kind of irregular size of the sub domains. This run was successful, without any error.

comment:3 Changed 9 years ago by vichi

  • Resolution set to wontfix
  • Status changed from new to closed

comment:4 Changed 5 years ago by nicolasmartin

  • Keywords offline added; OFFLINE removed

comment:5 Changed 5 years ago by nicolasmartin

  • Keywords nemo_v3_1* added

comment:6 Changed 5 years ago by nicolasmartin

  • Keywords OFF added; offline removed

comment:7 Changed 4 years ago by nemo

  • Keywords nemo_v3_1* removed
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