Hi Ralph,
This is the continuous story of "Segmentation fault in oob_tcp.c of
openmpi-1.7.4a1r29646".
I found the cause.
Firstly, I noticed that your hostfile can work and mine can not.
Your host file:
cat hosts
bend001 slots=12
My host file:
cat hosts
node08
node08
...(total 8 lines)
I modified my script file to add "slots=1" to each line of my hostfile
just before launching mpirun. Then it worked.
My host file(modified):
cat hosts
node08 slots=1
node08 slots=1
...(total 8 lines)
Secondary, I confirmed that there's a slight difference between
orte/util/hostfile/hostfile.c of 1.7.3 and that of 1.7.4a1r29646.
$ diff
hostfile.c.org ../../../../openmpi-1.7.3/orte/util/hostfile/hostfile.c
394,401c394,399
< if (got_count) {
< node->slots_given = true;
< } else if (got_max) {
< node->slots = node->slots_max;
< node->slots_given = true;
< } else {
< /* should be set by obj_new, but just to be clear */
< node->slots_given = false;
---
> if (!got_count) {
> if (got_max) {
> node->slots = node->slots_max;
> } else {
> ++node->slots;
> }
....
Finally, I added the line 402 below just as a tentative trial.
Then, it worked.
cat -n orte/util/hostfile/hostfile.c:
...
394 if (got_count) {
395 node->slots_given = true;
396 } else if (got_max) {
397 node->slots = node->slots_max;
398 node->slots_given = true;
399 } else {
400 /* should be set by obj_new, but just to be clear */
401 node->slots_given = false;
402 ++node->slots; /* added by tmishima */
403 }
...
Please fix the problem properly, because it's just based on my
random guess. It's related to the treatment of hostfile where slots
information is not given.
Regards,
Tetsuya Mishima
