In #7724 we made a number of perf optimisations related to enqueuing. One of these optimisations included moving the enqueue logic - including expensive prep work and db writes - to a separate thread.
At the same time manual DB locking was abandoned in favor of WAL mode.
Finally, we set `check_same_thread=False` to allow multiple threads to access the connection at a given time.
I think this may be the cause of #7950:
- We start an enqueue in a thread (running in bg)
- We dequeue
- Dequeue pulls a partially-written queue item from DB and we get the errors in the linked issue
To be honest, I don't understand enough about SQLite to confidently say that this kind of race condition is actually possible. But:
- The error started popping up around the time we made this change.
- I have reviewed the logic from enqueue to dequeue very carefully _many_ times over the past month or so, and I am confident that the error is only possible if we are getting unexpectedly `NULL` values from the DB.
- The DB schema includes `NOT NULL` constraints for the column that is apparently returning `NULL`.
- Therefore, without some kind of race condition or schema issue, the error should not be possible.
- The `enqueue_batch` call is the only place I can find where we have the possibility of a race condition due to async logic. Everywhere else, all DB interaction for the queue is synchronous, as far as I can tell.
This change retains the perf benefits by running the heavy enqueue prep logic in a separate thread, but moves back to the main thread for the DB write. It also uses an explicit transaction for the write.
Will just have to wait and see if this fixes the issue.
This reduces peak memory usage at a negligible cost. Queue items typically take on the order of seconds, making the time cost of a GC essentially free.
Not a great idea on a hotter code path though.
We've long suspected there is a memory leak in Invoke, but that may not be true. What looks like a memory leak may in fact be the expected behaviour for our allocation patterns.
We observe ~20 to ~30 MB increase in memory usage per session executed. I did some prolonged tests, where I measured the process's RSS in bytes while doing 200 SDXL generations. I found that it eventually leveled off at around 100 generations, at which point memory usage had climbed by ~900MB from its starting point.
I used tracemalloc to diff the allocations of single session executions and found that we are allocating ~20MB or so per session in `ModelPatcher.apply_ti()`.
In `ModelPatcher.apply_ti()` we add tokens to the tokenizer when handling TIs. The added tokens should be scoped to only the current invocation, but there is no simple way to remove the tokens afterwards.
As a workaround for this, we clone the tokenizer, add the TI tokens to the clone, and use the clone to when running compel. Afterwards, this cloned tokenizer is discarded.
The tokenizer uses ~20MB of memory, and it has referrers/referents to other compel stuff. This is what is causing the observed increases in memory per session!
We'd expect these objects to be GC'd but python doesn't do it immediately. After creating the cond tensors, we quickly move on to denoising. So there isn't any time for the GC to happen to free up its existing memory arenas/blocks to reuse them. Instead, python needs to request more memory from the OS.
We can improve the situation by immediately calling `del` on the tokenizer clone and related objects. In fact, we already had some code in the compel nodes to `del` some of these objects, but not all.
Adding the `del`s vastly improves things. We hit peak RSS in half the sessions (~50 or less) and it's now ~100MB more than starting value. There is still a gradual increase in memory usage until we level off.
* build: prevent `opencv-python` from being installed
Fixes this error: `AttributeError: module 'cv2.ximgproc' has no attribute 'thinning'`
`opencv-contrib-python` supersedes `opencv-python`, providing the same API + additional features. The two packages should not be installed at the same time to avoid conflicts and/or errors.
The `invisible-watermark` package requires `opencv-python`, but we require the contrib variant.
This change updates `pyproject.toml` to prevent `opencv-python` from ever being installed using a `uv` features called dependency overrides.
* feat(ui): data viewer supports disabling wrap
* feat(api): list _all_ pkgs in app deps endpoint
* chore(ui): typegen
* feat(ui): update about modal to display new full deps list
* chore: uv lock
