インテル® VTune™ Amplifier 2018 ヘルプ
Intel® VTune™ Amplifier provides an option to generate a Profile-Guided Optimization (PGO) report for Intel® Compiler (Linux* only), Clang* compiler, and GCC* compiler. Using this information the compilers can provide a better performance optimization when compiling your code.
This is a PREVIEW FEATURE. A preview feature may or may not appear in a future production release. It is available for your use in the hopes that you will provide feedback on its usefulness and help determine its future. Data collected with a preview feature is not guaranteed to be backward compatible with future releases. Please send your feedback to parallel.studio.support@intel.com or to intelsystemstudio@intel.com.
To generate a PGO report, use the amplxe-pgo-report.sh utility located, by default, in the <install-dir>/bin64.
Use the following amplxe-pgo-report syntax to generate a report:
> amplxe-pgo-report.sh [options] -- app arg1 arg2...
where [options] are the following:
Option |
Description |
|---|---|
-r | --result <name> |
Specify a result directory and PGO report name template. Default template is r@@@pgo. |
-c | --compiler <compiler> |
Specify a compiler for PGO output format. Supported values are the following:
Default value is icc. |
-h | --help |
Show help. |
Example:
> amplxe-pgo-report.sh -r r@@@pgo -c icc -- /home/sample/myapp
This command line generates a PGO report based on the hardware event-based sampling analysis for the Intel® C++ compiler (icc). When the report is generated, the VTune Amplifier provides a message specifying the output file name and location on your system, for example: PGO report file was created: /home/foo/r000pgo_icc.pgo.
Use the *.pgo file generated by the VTune Amplifier for the profile-guided optimization with your compiler by adding the following options during compilation:
-prof-use-sampling=<pgo-file> for the icc compiler
-fprofile-sample-use=<pgo-file> for the clang compiler
-fauto-profile=<pgo-file> for the gcc compiler
For more details on the PGO support from the compiler side, explore the compiler documentation:
https://gcc.gnu.org/onlinedocs/gcc-6.3.0/gcc/Optimize-Options.html#Optimize-Options
https://clang.llvm.org/docs/UsersManual.html#using-sampling-profilers
Generating a PGO report for remote Linux applications is not supported.
Generating a PGO report is supported for the Launch Application mode. Profile System and Attach to Process modes are not supported.