CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > SU2

SU2 Scalability

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree1Likes
  • 1 Post By OVS

LinkBack Thread Tools Display Modes
Old   March 3, 2017, 18:24
Default SU2 Scalability
New Member
Oliver V
Join Date: Dec 2015
Posts: 17
Rep Power: 4
OVS is on a distinguished road

I am trying to solve a steady RANS airflow around a 3D Wing with 5 million nodes (15 M elts, unstructured cgns).

I have acces to a cluster, however it seems that after a given amount of cores (192) the solver has problems in the MPI communications and memory management department. It usually exits with a:

mpirun noticed that process rank XX with PID YYYYY on node ab1234 exited on signal 11 (Segmentation fault).
Talking with the technicians of the cluster they tell me that at some point SU2 violates its allocated memory for a given thread (which crashes the calculation). It seems to me that SU2 loads all the work into the master node either while reading (at the begining, if restarting) or writing solutions (be it the restart file or - mainly - when generating the flow.dat file).

I'm running on a cluster with 24 ppn and 32GB per node - swiching from 8 to 12 nodes to find the one configuration that *might* work -.

A problem of this size shouldn't be difficult to solve for this type of cluster... I asked around and a colleague solved a DNS simulation with around 200M nodes in roughly 100h with 144 cores (2 years ago), yet it takes me roughly 60h for a 5M node compressible steady RANS-SA simulation with 192 cores... which sometimes crashes because of single thread memory issues.

Has someone had problems scaling SU2 (using several processors)? How many processors have you managed to use at max? Have you done an efficiency test (to find the point where you no longer gain time with parallel calculations)? What about memory usage?

Haowang likes this.
OVS is offline   Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Official Release of SU2 V3.2 economon SU2 News & Announcements 6 April 17, 2015 23:28
Tool to download: SU2 post-processing Combas SU2 2 June 5, 2014 14:55
Pointwise-SU2 joint webinar (April 29th) and SU2 v3.1.0 new release fpalacios SU2 News & Announcements 1 April 30, 2014 02:40
Official release of SU2 V3.0 and SU2 Educational V1.0 fpalacios SU2 News & Announcements 2 January 22, 2014 06:28
Welcome to the Stanford University Unstructured (SU2) forum! economon SU2 0 January 7, 2013 03:48

All times are GMT -4. The time now is 23:33.