HP NonStop G-Series - Manual (Page 157)

Balancing and Tuning a System
Measure User’s Guide — 520560-003
7- 21
Checking and Tuning Problem Areas
Response time should improve as the system is balanced. Do not treat response time
subjectively. A system can seem faster or slower depending on how much needs to be
accomplished.
Resolving Remaining Problems
If your system still has a performance problem:
•
For more tuning information on systems running Pathway applications, see the
NonStop TS/MP and Pathway System Management Guide and the NonStop
TS/MP and Pathway Management Reference Manual.
•
Check for application design problems. Poorly designed applications can cause
performance problems that simple load balancing cannot solve. These symptoms
indicate design problems:
°
Looping batch processes that overload disks
°
Poorly assigned application process priorities causing unnecessary queues
and underutilized CPUs
°
Frequent, unnecessary application process creations and file opens and closes
°
Unnecessary or overly long record locks, as indicated by a high
REQUESTS-BLOCKED counter in the DISC report
°
Long internal queues
PROCESS reports list MQC-ALLOCATIONS and MQC-ALLOC-FAILURES.
However, because an MQC request takes 10 seconds to fail, a CPU can waste
time waiting for MQCs without the problem appearing in MQC-ALLOC-FAILURES.
•
Reduce spooler overhead by specifying printer locations, combining small jobs into
a single large job, and suppressing banner pages whenever possible.