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# Synchronization Validation Development
This document contains miscellaneous information related to development of synchronization validation.
## Error messages
### How to diff-compare error messages before and after the change
The syncval error reporting code uses helper routines to generate the parts of the error messages. One potential issues with this shared code is when modifying a specific error message it's possible to accidentally break another one. The easiest way to validate the scope of the changes is to compare the output of all negative tests before and after the change.
The following components of the error messages vary between the runs:
* gtest timing
* dispatchable handles
`--gtest_print_time=0` removes the timing information
Use [this patch](https://github.com/user-attachments/files/18318045/remove-dispatchable-handles.patch) to replace all dispatchable handles with zero values. It should be applied only locally to `layers/error_messages/logging.cpp`.
Run the negative tests before and after the change:
```
--gtest_filter=NegativeSyncVal*.* --print-vu --gtest_print_time=0 >syncval_{before/after}.txt
```
Diff-compare output files.
## SyncVal stats
Build the project with `VVL_ENABLE_SYNCVAL_STATS=1` preprocessor definition to enable the collection of syncval statistics. This can be set either as a -D option in CMake or modified manually in `layers/sync/sync_stats.h`
If `VVL_ENABLE_SYNCVAL_STATS=1` environment variable is also set, statistics will be printed to console when the application exits. During development, statistics can be printed at any time by calling `Stats::CreateReport()`. The statistics tracking object is a member of the syncval validator (`SyncValidator::stats`) and can be inspected directly during development.
If the *mimalloc* allocator is used, syncval statistics can also collect allocation information using the mimalloc stats system. The mimalloc dependency must be build with `MI_STAT=1` preprocessor definition. The total amount of allocated memory is tracked in `Stats::total_allocated_memory`, and all mimalloc stats are stored in `Stats::mi_stats`.
The mimalloc statistics are updated at fixed points: `vkQueueSubmit`, `vkQueuePresent`, and when generating a report via `Stats::CreateReport()`. To update mimalloc stats manually at arbitrary point, call `Stats::UpdateMemoryStats`.
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