Thanks for the help with how to set up the collectives file. I am unable to make it work though,
My simple alltoall test is still crashing, although I added even added a line specifically for my test commsize of 64 and 100 bytes using bruck.
daniels@kalkyl1:~/.openmpi > cat mca-params.conf
coll_tuned_use_dynamic_rules=1
coll_base_verbose=0
coll_tuned_dynamic_rules_filename="/home/daniels/.openmpi/dynamic_rules_file"
daniels@kalkyl1:~/.openmpi > cat dynamic_rules_file
1 # num of collectives
3 # ID = 3 Alltoall collective (ID in coll_tuned.h)
1 # number of com sizes
64 # comm size 64
3 # number of msg sizes
0 3 0 0 # for message size 0, bruck 1, topo 0, 0 segmentation
100 3 0 0 # for message size 100, bruck 1, topo 0, 0 segmentation
8192 2 0 0 # 8k+, pairwise 2, no topo or segmentation
# end of collective rule
Still it useful to know how to do this, when this issue gets fixed in the future!
Daniel
Den 2009-12-30 15:57:50 skrev Lenny Verkhovsky <lenny.verkhovsky@gmail.com>:
The only workaround that I found is a file with dynamic rules.
This is an example that George sent me once. It helped for me, until it will
be fixed.
" Lenny,
You asked for dynamic rules but it looks like you didn't provide them.
Dynamic rules allow the user to specify which algorithm to be used for each
collective based on a set of rules. I corrected the current behavior, so it
will not crash. However, as you didn't provide dynamic rules, it will just
switch back to default behavior (i.e. ignore the
coll_tuned_use_dynamic_rules MCA parameter).
As an example, here is a set of dynamic rules. I added some comment to
clarify it, but if you have any questions please ask.
2 # num of collectives
3 # ID = 3 Alltoall collective (ID in coll_tuned.h)
1 # number of com sizes
64 # comm size 64
2 # number of msg sizes
0 3 0 0 # for message size 0, bruck 1, topo 0, 0 segmentation
8192 2 0 0 # 8k+, pairwise 2, no topo or segmentation
# end of collective rule
#
2 # ID = 2 Allreduce collective (ID in coll_tuned.h)
1 # number of com sizes
1 # comm size 2
2 # number of msg sizes
0 1 0 0 # for message size 0, basic linear 1, topo 0, 0 segmentation
1024 2 0 0 # for messages size > 1024, nonoverlapping 2, topo 0, 0
segmentation
# end of collective rule
#
And here is what I have in my $(HOME)/.openmpi/mca-params.conf to activate
them:
#
# Dealing with collective
#
coll_base_verbose = 0
coll_tuned_use_dynamic_rules = 1
coll_tuned_dynamic_rules_filename = **the name of the file where you saved
the rules **
"
On Wed, Dec 30, 2009 at 4:44 PM, Daniel Spångberg <daniels@mkem.uu.se>wrote:
Interesting. I found your issue before I sent my report, but I did not
realise that this was the same problem. I see now that your example is
really for openmpi 1.3.4++
Do you know of a work around? I have not used a rule file before and seem
to be unable to find the documentation for how to use one, unfortunately.
Daniel
Den 2009-12-30 15:17:17 skrev Lenny Verkhovsky <lenny.verkhovsky@gmail.com
>:
This is the a knowing issue,
https://svn.open-mpi.org/trac/ompi/ticket/2087
Maybe it's priority should be raised up.
Lenny.
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Daniel Spångberg
Materialkemi
Uppsala Universitet
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