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OpenVMS System Performance Management

( Duration: 5 Days )

This OpenVMS System Performance Management training course presents OpenVMS performance under three subsystems: memory management, I/O, and CPU.

By attending OpenVMS System Performance Management workshop, delegates will learn to:

Isolate performance bottlenecks to one of the three subsystems
Identify the effects of SYSGEN parameters on each of the subsystems, when to change these parameters, and when other management modifications or the purchase of new hardware will be required
Keep the system running and tune the system
Understand and use AUTOGEN effectively

Attend a training on OpenVMS System Management or equivalent practical experience
Understanding of programming concepts (compiling, linking, and executing programs)

The OpenVMS System Performance Management class is ideal for:

OpenVMS system managers
OpenVMS system programmers

COURSE AGENDA

1

General Performance Topics

Performance issues
Performance bottlenecks
OpenVMS performance metrics
OpenVMS performance tools

2

Layout of Virtual Address Space

Layout of virtual address space (VAX, Alpha, IA64)
Address space
OpenVMS memory management
P0 space contents
P1 space layout
System space layout (Alpha, IA64)
System space
S0/S1 space
Monitoring pool
Nonpaged pool reclamation
Pool zones
Lock manager use of pool zones

3

Image Activation and Paging

Paging compared to swapping
Address translation
Page faults
Locating pages in virtual memory
Producing an image file
Image activation and paging
Free page list
Valid pages and the working set list
Free list fault rate
Modified list fault rate
Secondary hard faults

4

Interpreting Paging Metrics

Sample display from $ MONITOR PAGE
Interpreting the $ MONITOR PAGE display
Interpreting paging metrics
$ SHOW MEMORY (Alpha, IA64)
$ MONITOR PAGE

5

Working Sets and Automatic Working Set Adjustment

Working set list
Working set size vs. working set list size
Parameters affecting the working set list size
Automatic Working Set Adjustment (AWSA)
Working set performance considerations
AWSA performance considerations
AWSA parameters

6

Locality and Paging Performance

Locality
Locality issues
Effects of poor locality
Effect of improving locality

7

Shared Image Cost and Benefits

Shared image costs and benefits
Image activation and paging
Linking shareable images
Alpha & IA64 resident images
Shared address data

8

The Modified Page List and Modified Page Writing

Modified page list
Modified page list parameters and metrics
Modified page list performance considerations
MPL performance and analysis
Modified page writer parameter relationships

9

The Swapper and Memory Reclamation

The Swapper and memory reclamation
Free page list parameter relationships

10

General I/O Flow

General I/O flow
Geometry of disks
Time-based components of a disk transfer
Optimization of disk operations
Virtual I/O cache
Extended File Cache (XFC)
XFC SYSGEN parameters
Permanent vs. dynamic XFC cache size
Monitoring the XFC
$ SHOW MEMORY/CACHE
Monitoring volume activity
Monitoring file activity
Cache control
Resetting cache counters

11

Analyzing the Effects of Fragmentation

Determining I/O rates
Dump of header for X.DAT
Effect of making file contiguous
Effect of making both files contiguous
Using multiple spindles

12

Controller Optimizations

Controller optimizations
Locating bottlenecks
Other optimizations through layered products
RAID

13

Files-11 ODS-2, ODS-5 Concepts

Files-11 terminology
Directory concepts
File open operation

14

Contiguity and the File System

Contiguity and the file system
Window turns
Preventing fragmentation
Split transfers
Window turns vs. split transfers
Accessing sequential files
Accessing files randomly

15

File System Caches

File system caches
$ MONITOR FILE
Shared and private caches
Checking for shrunken caches

16

RMS Structures and Design Considerations

RMS file concepts
Summary of RMS file organizations
File structures
Indexed file organization for a file with no alternate keys
RMS interfaces for affecting file structure
Bucket splits
Indexed file growth
Factors affecting bucket splits
Duplicate keys for data records
Compression

17

RMS Utilities

File definition language
Techniques for creating data files using an FDL file
Creating a data file from an FDL file
Optimizing RMS indexed files
Examining file structures
Example using RMS utilities to tune an indexed file structure
Example testing random access of indexed files

18

RMS I/O Buffering Considerations

Buffers and buckets
Design considerations
Multiblock count example
Read ahead/write behind
Deferred write
Setting up multiple buffers
Determining the number of local buffers
Global buffers

19

MONITOR RMS

$ MONITOR RMS
$ MONITOR RMS example

20

Understanding CPU Performance

CISC vs. RISC vs. EPIC architectures
Understanding CPU performance
Alignment considerations example
Data alignment issues
Nonaligned data example
Nonaligned and compiler aligned data sample runs
Aligned data example
Badly aligned example
Well aligned example
C code with bad alignment
C small data accesses issues
C code with good alignment
Debugger issues
Using the BREAK/UNALIGNED Debugger Option
CPU performance and symmetric multiprocessing
Cell-based systems performance options
Galaxy shared-everything model
CPU migration options
Sample CPU migration using DCL
CPU and interrupt controls using DCL

21

Understanding Time Spent in Modes

OpenVMS access modes
Interrupt stack/state time
$ MONITOR TIMER
Sample $ MONITOR TIMER
Impact of high timer service rate
MP synchronization time
Dedicated CPU Lock Manager
Dedicated CPU Lock Manager interaction
Dedicated CPU Lock Manager examples
Impact of the Dedicated CPU Lock Manager
Dedicated CPU Lock Manager litmus test
Idle time
Examining time spent in access modes
Compatibility mode time
Analyzing time spent in modes

22

OpenVMS Scheduling and Priorities

Quantum and CPU time
Priorities
Waiting states
States of concern
Class scheduler
Class scheduler example

23

Locking Concepts

Locking concepts
Other characteristics of locks
Application design and locking performance
Locking considerations
Record options in RAB for locking shared files
Sample $ MONITOR LOCK/local buffers
$ MONITOR LOCK display (global buffers)
Interpreting the MONITOR LOCK display
Lock manager parameters
Global buffers
Global buffer read-mode bucket locking
RMS contention policies
Setting RMS contention policies
No query locking

24

Distributed Locking Concepts

Distributed locking concepts
LOCKDIRWT and PE1
PE1 processing
$ MONITOR RLOCK
Sample $ MONITOR RLOCK
Lock tree inbound example
Higher activity example
Higher LOCKDIRWT example
Performance issues with distributed locking
Distributed locking example

25

The MSCP Server

MSCP server
Interpreting $ MONITOR MSCP

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