Configuration File xrt.ini¶

XRT uses various parameters to control execution flow, debug, profiling, and message logging during host application and kernel execution in software emulation, hardware emulation, and system run on the acceleration board. These control parameters are optionally specified in a runtime initialization file xrt.ini

XRT looks for xrt.ini in host executable path and current directory in that order. It stops search when an xrt.ini is found. If xrt.ini is not found, XRT built-in defaults are used as described in the table below.

Runtime Initialization File Format¶

The runtime initialization file is a text file with groups of keys and their values. Any line beginning with a semicolon (;) or a hash (#) is a comment. The group names, keys, and key values are all case in-sensitive.

There are three group of keys as below

Runtime: The keys in this group impact general XRT flow

Debug: The keys in this group are used to generate and configure the debug related files such as profile report and timeline trace

Emulation: The keys in this group are related to the Emulation flow only

The following is a simple example that turns on profile timeline trace and sends the runtime log messages to the console.

#Start of Runtime group
[Runtime]
runtime_log = console

#Start of Debug group
[Debug]
timeline_trace = true

API Support: From 2020.2 release the runtime configuration options can also be provided through C or C++ APIs.

C APIs

xrtIniStringSet: Set a key and correspondong string value pair

xrtIniUintSet : Set a key and corresponding integer value pair

C++ API

xrt::ini::set

Example

xrt::ini::set("Runtime.runtime_log", "console");
xrt::ini::set("Runtime.verbosity", 5);

The following table lists all supported groups, keys, valid key values, and short descriptions on the function of the keys.

Runtime Group¶

Key	Valid Values	Description
api_checks	[true\|false]	Enable or disable OpenCL API checks: true: enable false: disable Default: true
runtime_log	[null\|console\|syslog\|filename]	Specify where the runtime logs are printed: null: Do not print any logs. console: Print logs to stdout syslog: Print logs to Linux syslog filename: Print logs to the specified file. Example, runtime_log=my_run.log Default: console
cpu_affinity	[{N,N,…}]	Pin all runtime threads to specified CPUs. Example: cpu_affinity = {4,5,6}
verbosity	[0\|1\|2\|3\|4\|5\|6\|7]	verbosity level of log messages. Higher number implies more verbosity Default: 4
exclusive_cu_context	[false\|true]	When setting true OpenCL process holds exclusive access of the Compute Units Default: false

Debug Group¶

Key	Valid Values	Description
profile	[true\|false]	Enable or disable OpenCL host code profile. Set true to generate profile_summary report Default: false
timeline_trace	[true\|false]	Enable or disable profile timeline trace. Set true to generate timeline_trace report Default: false
data_transfer_trace	[coarse\|fine\|off]	Enable device-level AXI transfers trace: coarse: Shows CU transfer activity fine: Shows all AXI level burst data transfer off: Does not show device-level AXI transfer Default: off
stall_trace	[dataflow\|memory\|pipe\|all\|off]	Specifies type of stalls to be captured in timeline trace report: dataflow: Stall related to intra-kernel streams memory: Stall related to memory transfer pipe: Inter-kernel pipes, applicable to OpenCL kernel all: All type of stalls off: Does not show stalls Default: off
app_debug	[true\|false]	If true, enable xprint and xstatus command during debugging with xgdb Default: false
trace_buffer_size	[N {K\|M\|G}]	Specifies the size of DDR/HBM memory for storing trace data: N: Integer K\|M\|G: Units Kilobyte or Megabyte or Gigabyte Note: This option only applicable in hardware flow If no unit is given byte is assumed Example: trace_buffer_size=100M Default: 1M
lop_trace	[false\|true]	Enables or disables low overhead profiling. false: Disable low overhead profiling true : Enable low overhead profiling Default: false
continuous_trace	[false\|true]	Enables the continuous offload of the device data while the application is running. In the event of a crash/hang a trace file will be available to help debugging. false: Disable continous trance true : Enable continuous trace Default: false
continuous_trace_inte- rval_ms	[N]	Specifies the interval in millisecond to offload the device data in continous trace mode (see above) Default: 10

Emulation Group¶

Key	Valid Values	Description
aliveness_message_interval	[N]	Specify the interval in seconds that aliveness messages need to be printed. Default:300
print_infos_in_console	[true\|false]	Controls the printing of emulation info messages to users console. Emulation info messages are always logged into a file called emulation_debug.log true = print in users console false = do not print in user console Default: true
print_warning_in_console	[true\|false]	Controls the printing of emulation warning messages to users console. Emulation warning messages are always logged into a file called emulation_debug.log true = print in users console false = do not print in user console Default: true
print_errors_in_console	[true\|false]	Controls the printing of emulation error messages to users console. Emulation error messages are always logged into a file called emulation_debug.log true = print in users console false = do not print in user console Default: true
launch_waveform	[off\|batch\|gui]	Specify how the waveform is saved and displayed during emulation: off: Do not launch simulator waveform GUI, and do not save wdb file batch: Do not launch simulator waveform GUI, but save wdb file gui: Launch simulator waveform GUI, and save wdb file Default: off Note: The kernel needs to be compiled with debug enabled for the waveform to be saved and displayed in the simulator GUI.
timeout_scale	[na\|ms\|sec\|min]	Specify the time scaling unit of timeout specified clPollStreams command, otherwise Emulation does not support timeout specified in clPollStreams command Default:na (not applicable)