I discovered a similar limit for inter-node connections, effectively
limiting the maximum cluster size to 100 nodes (or so):
https://sourceforge.net/p/opensaf/tickets/2240/
I made some progress refactoring DTM to use epoll instead of poll, so
that the 100-node limit could be removed without sacrificing
performance. This refactoring focused on the inter-node communication,
but we could do the same also for intra-node communication.
regards,
Anders Widell
On 07/11/2017 11:16 PM, Carroll, James R wrote:
All,
I am using opensaf 5.0, configured to use TCP. We recently encountered an
issue with the DTM_INTRANODE_MAX_PROCESSES=100.
We were unaware if this seemingly random restriction, and we just happened to
be starting a large number of processes, easily exceeding the default value of
100. It took quite some time to figure out that we had exceeded this limit.
Setting the value to a larger value resolved the issue.
The error messages generated by exceeding this number were not very helpful,
often just indicating MDS messaging errors.
It would have been much more helpful to have a message of the form "MAX Processes
exceeded, cannot start remaining processes".
Instead, the obscure error messages led us down a path where we thought
processes were getting starved out, etc,
Is there any type of open ticket regarding this limitation? Can one be added?
Thanks.
Jim
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