other: slightly reduce the CPU time spent for draws #918
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We used to draw each data set separately as a new canvas. Now, in one canvas, we draw all datasets. Note that this changes how dataset lines are drawn - rather than drawing one on top of another, it now draws kinda all at once. This effect is *kinda* a bit better IMO, but it might also look a bit more cluttered.
Codecov ReportBase: 19.24% // Head: 19.22% // Decreases project coverage by
Additional details and impacted files@@ Coverage Diff @@
## master #918 +/- ##
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- Coverage 19.24% 19.22% -0.02%
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Files 74 74
Lines 14069 14094 +25
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+ Hits 2708 2710 +2
- Misses 11361 11384 +23
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Flamegraphs showed that this area seems to be a bit heavy at times with some inefficient use of iterators and collection. This change should hopefully optimize this a bit by reducing some collections or reallocations. There can also be some further optimizations with less allocations from callers.
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Description
A description of the change, what it does, and why it was made. If relevant (such as any change that modifies the UI), please provide screenshots of the changes:
Slightly reduces CPU time spent on drawing through two small changes:
truncate_texta bit.The first change results in graphs with a lot of stacked datasets like the "all" CPU graph looking like this instead:
(For small graphs with few/one dataset, it looks the same):
We can replicate the old effect by switching layers on each draw, but I'm not sure if it's better or worse.
Perfromance-wise can see the general effects through flamegraphs (
cargo flamegraph --bin btm, withdebug = trueandstrip = false):Before the change, drawing took almost 40% of the flamegraph time (measured over ~30 minutes):
After, it's taking only about 14% (also ~30 minutes):
The other usage from the flamegraph is about the same, so it should hopefully be a reasonable comparison. Running the pre-change and post-change binaries together also shows less CPU time spent on the post-change binary.
Issue
If applicable, what issue does this address?
Closes: #
Testing
If relevant, please state how this was tested. All changes must be tested to work:
If this is a code change, please also indicate which platforms were tested:
Checklist
If relevant, ensure the following have been met:
cargo fmt)README.md, help menu, doc pages, etc.)