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* re-organize docs * add link among docs * add link to build docs * fix style * de-duplicate sections
105 lines
3.1 KiB
Markdown
105 lines
3.1 KiB
Markdown
# Debugging Tests Tips
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## How to run & execute or debug a specific test without anything else to keep the feedback loop short?
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There is a script called debug-test.sh in the scripts folder whose parameter takes a REGEX and an optional test number.
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For example, running the following command will output an interactive list from which you can select a test. It takes this form:
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`debug-test.sh [OPTION]... <test_regex> <test_number>`
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It will then build & run in the debugger for you.
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To just execute a test and get back a PASS or FAIL message run:
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```bash
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./scripts/debug-test.sh test-tokenizer
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```
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To test in GDB use the `-g` flag to enable gdb test mode.
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```bash
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./scripts/debug-test.sh -g test-tokenizer
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# Once in the debugger, i.e. at the chevrons prompt, setting a breakpoint could be as follows:
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>>> b main
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```
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To speed up the testing loop, if you know your test number you can just run it similar to below:
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```bash
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./scripts/debug-test.sh test 23
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```
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For further reference use `debug-test.sh -h` to print help.
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### How does the script work?
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If you want to be able to use the concepts contained in the script separately, the important ones are briefly outlined below.
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#### Step 1: Reset and Setup folder context
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From base of this repository, let's create `build-ci-debug` as our build context.
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```bash
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rm -rf build-ci-debug && mkdir build-ci-debug && cd build-ci-debug
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```
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#### Step 2: Setup Build Environment and Compile Test Binaries
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Setup and trigger a build under debug mode. You may adapt the arguments as needed, but in this case these are sane defaults.
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```bash
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cmake -DCMAKE_BUILD_TYPE=Debug -DLLAMA_CUDA=1 -DLLAMA_FATAL_WARNINGS=ON ..
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make -j
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```
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#### Step 3: Find all tests available that matches REGEX
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The output of this command will give you the command & arguments needed to run GDB.
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* `-R test-tokenizer` : looks for all the test files named `test-tokenizer*` (R=Regex)
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* `-N` : "show-only" disables test execution & shows test commands that you can feed to GDB.
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* `-V` : Verbose Mode
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```bash
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ctest -R "test-tokenizer" -V -N
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```
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This may return output similar to below (focusing on key lines to pay attention to):
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```bash
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...
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1: Test command: ~/llama.cpp/build-ci-debug/bin/test-tokenizer-0 "~/llama.cpp/tests/../models/ggml-vocab-llama-spm.gguf"
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1: Working Directory: .
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Labels: main
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Test #1: test-tokenizer-0-llama-spm
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...
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4: Test command: ~/llama.cpp/build-ci-debug/bin/test-tokenizer-0 "~/llama.cpp/tests/../models/ggml-vocab-falcon.gguf"
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4: Working Directory: .
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Labels: main
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Test #4: test-tokenizer-0-falcon
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...
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```
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#### Step 4: Identify Test Command for Debugging
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So for test #1 above we can tell these two pieces of relevant information:
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* Test Binary: `~/llama.cpp/build-ci-debug/bin/test-tokenizer-0`
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* Test GGUF Model: `~/llama.cpp/tests/../models/ggml-vocab-llama-spm.gguf`
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#### Step 5: Run GDB on test command
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Based on the ctest 'test command' report above we can then run a gdb session via this command below:
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```bash
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gdb --args ${Test Binary} ${Test GGUF Model}
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```
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Example:
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```bash
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gdb --args ~/llama.cpp/build-ci-debug/bin/test-tokenizer-0 "~/llama.cpp/tests/../models/ggml-vocab-llama-spm.gguf"
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```
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