Expand Configuration and Management Manual (G06.24+)

Tuning
Expand Configuration and Management Manual—523347-008
20-17
Multi-CPU Paths
•
At configurable times during the day. You can use the SCF ALTER PROCESS,
AUTOREBALANCE command to specify when rebalancing should occur. Both the
time of day and the interval between rebalance attempts can be specified, allowing
you to schedule a rebalance when traffic is minimal.
•
Immediately. You can use the SCF RESET PROCESS command to cause an
immediate rebalance.
•
When a path goes down. (In this case, the rebalancing algorithm is not actually
used; instead, new connections are set up according to the current load.)
Superpath Load Distribution
The Superpaths feature does not distribute the load equally over all paths. A superpath
distributes the load based on three criteria:
•
CPU Matching
•
Load Factor Balancing
•
Pair Count Balancing
CPU Matching
This takes effect when the two systems are directly connected with a superpath; that
is, they are direct neighbors. The system matches up the local and remote CPUs of the
two processes sending and receiving the messages with a line handler on the same
CPUs.
Figure 20-3 illustrates two systems that have a superpath connecting them, with a line
handler on CPU 1 and CPU 3:
Figure 20-3. CPU Matching
CPU 0
CPU 1
CPU 2
CPU 3
CPU 0
CPU 1
CPU 2
CPU 3
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