Tutorial: Debugging with Intel® Distribution for GDB*
Debugging Options¶
Auto-Attach¶
The auto-attach feature enables listening to debug events from the GPU.
This feature allows the debugger to launch a gdbserver-gt process to
listen to GPU debug events and add the gdbserver-gt to the debugger
as an inferior. This feature is designed to improve your debugging
experience and ensure that you can debug the kernel offloaded to GPU.
The auto-attach feature is enabled by default.
The feature does not affect the debugging capability on the CPU device.
However, to eliminate the extra output the feature creates, you can turn
it off with the INTELGT_AUTO_ATTACH_DISABLE environment variable. To
do it, execute the following command on the shell before starting
gbd-oneapi:
export INTELGT_AUTO_ATTACH_DISABLE=1
To enable the feature again:
unset INTELGT_AUTO_ATTACH_DISABLE
Pretty-Printing¶
The pretty-printing feature simplifies the display of complex objects. If a pretty-printer is registered for the type of value you are going to print, the debugger simplifies the output. Otherwise, the debugger prints the value normally.
Intel® Distribution for GDB* supports pretty-printing for SYCL* types
id, buffer, and range from the cl::sycl namespace.
To display the list of pretty-printers available, run the following command:
info pretty-print
Example output:
global pretty-printers:
SYCL
cl::sycl::buffer
cl::sycl::id
cl::sycl::range
builtin
mpx_bound128
Pretty-printing is enabled by default. For example, when you print a
value of the index variable:
print index
The output is the following:
$10 = cl::sycl::id<1> = {32}
To disable pretty-printing and display raw content instead, use the
/r flag:
print /r index
Example output:
$11 = {<cl::sycl::detail::array<1>> = {common_array = {32, <No data fields>}}}
To disable all pretty-printers, use the following command:
disable pretty-printer
To enable pretty-printers:
enable pretty-printer