Configuring FDO Parameters

Before performing automatic FDO, modify the configuration file of the GCC FDO component and adjust the running parameters to meet compilation requirements.

Open the configuration file.
1
vi A-FOT/a-fot.ini

Press i to enter the insert mode and modify the configuration file as follows. For details about the parameters, see Table 1.

application_name=mysqld
bin_file=/usr/local/mysql-gcc/bin/mysqld
work_path=/tmp
build_script=/root/build.sh
run_script=/root/run.sh
max_waiting_time=600
opt_mode=AutoBOLT
perf_time=600
gcc_path=/usr/
check_success=1
build_mode=Wrapper

**Table 1** FDO parameters
Parameter	Description
application_name=mysqld	Application name.
bin_file=/usr/local/mysql-gcc/bin/mysqld	Path to the binary file of the application.
work_path=/tmp	Application working path, which is used to compile the application or store the profile.
build_script=/root/build.sh	Path to the application build script.
run_script=/root/run.sh	Path to the script for running the application. /root/run.sh is used as an example.
max_waiting_time=600	Maximum waiting time for the application to start, in seconds.
opt_mode=AutoBOLT	Optimization mode. The options are as follows: AutoFDO: automatic feedback-directed optimization. AutoPrefetch: automatic prefetch. AutoBOLT: automatic binary optimization. Auto_kernel_PGO: automatic kernel profile-guided optimization. The AutoBOLT mode is used in the MySQL database scenario.
perf_time=600	Perf sampling duration, in seconds. NOTICE: Set this parameter to a value less than or equal to the test execution duration.
gcc_path=/usr/	Path to the GCC compiler.
check_success=1	Checks whether the optimization is enabled. The value 1 indicates that this check is enabled, and the value 0 indicates that this check is disabled.
build_mode=Wrapper	Build mode, which can be set to Bear or Wrapper. The Wrapper mode is used in the MySQL database scenario.

Press Esc to exit the insert mode. Type :wq! and press Enter to save the file and exit.

Parent topic: Automatic FDO