Segment Flags................................................................................................................. | 196 |
Mapfile Segment Declaration Examples.............................................................................. | 197 |
Defining Mapfile Section Mapping Directives........................................................................... | 197 |
Internal Map Structure........................................................................................................... | 198 |
Placement of Segments in an Executable............................................................................. | 198 |
Mapping Input Sections to Segments.................................................................................. | 198 |
Interaction between User-defined and Default Mapfile Directives............................................. | 200 |
Mapfile Option Error Messages.............................................................................................. | 200 |
Fatal Errors..................................................................................................................... | 200 |
Warnings ...................................................................................................................... | 201 |
10 Improving Your Application Performance.................................................. | 202 |
Linker Optimizations.............................................................................................................. | 202 |
Invoking Linker Optimizations from the Compile Line............................................................. | 202 |
Incompatibilities with other Options ................................................................................... | 203 |
Unused Procedure Elimination with +Oprocelim................................................................... | 203 |
Complete Executables.................................................................................................. | 203 |
Incomplete Executables................................................................................................ | 204 |
Shared Libraries.......................................................................................................... | 204 |
Retain Unreferenced Symbols with +noprocelim_sym........................................................ | 204 |
Relocatable Objects.................................................................................................... | 204 |
Affects on Symbolic Debugging.................................................................................... | 204 |
Profile-Based Optimization (PA-RISC).................................................................................. | 204 |
General Information about PBO.................................................................................... | 204 |
Using PBO ................................................................................................................ | 205 |
When to Use PBO....................................................................................................... | 205 |
How to Use PBO......................................................................................................... | 205 |
Instrumenting (+I/-I)..................................................................................................... | 206 |
The Startup File icrt0.o............................................................................................ | 207 |
The -I Linker Option................................................................................................. | 207 |
Code Generation from I-SOMs................................................................................. | 207 |
Building Portable Code with Linker Optimization......................................................... | 208 |
Profiling..................................................................................................................... | 208 |
Choosing Input Data............................................................................................... | 208 |
The flow.data File................................................................................................... | 208 |
Storing Profile Information for Multiple Programs......................................................... | 209 |
Sharing the flow.data File Among Multiple Processes.................................................. | 209 |
Forking an Instrumented Application......................................................................... | 210 |
Optimizing Based on Profile Data (+P/-P)....................................................................... | 210 |
The -P Linker Option................................................................................................ | 210 |
Using The flow.data File.......................................................................................... | 211 |
Specifying a Different flow.data File with +df.............................................................. | 211 |
Specifying a Different flow.data with FLOW_DATA...................................................... | 211 |
Interaction between FLOW_DATA and +df ................................................................ | 211 |
Specifying a Different Program Name (+pgm)............................................................ | 211 |
Selecting an Optimization Level with PBO....................................................................... | 212 |
Using PBO to Optimize Shared Libraries........................................................................ | 212 |
Using PBO with ld -r.................................................................................................... | 213 |
Restrictions and Limitations of PBO................................................................................ | 214 |
Temporary Files...................................................................................................... | 214 |
Source Code Changes and PBO.............................................................................. | 214 |
Profile-Based Optimization (PBO) and High-Level Optimization (HLO)............................ | 214 |
I-SOM File Restrictions............................................................................................. | 215 |
Compatibility with 9.0 PBO..................................................................................... | 216 |
Compatibility with 9.0 PBO.......................................................................................... | 216 |