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Heatmap replay shows zero duration and sample rate #161008
Description
Bug report
Replaying a binary profile with --heatmap shows zero duration and sample rate even though both values are stored in the file
Repro:
import time
time.sleep(2)Run:
sudo ./python.exe -m profiling.sampling run --binary -o repro.bin repro.py
sudo ./python.exe -m profiling.sampling replay --heatmap -o repro-report repro.bin
We will get:
Captured 2,024 samples in 2.02 seconds
Sample rate: 999.94 samples/sec
Error rate: 0.00
Binary Encoding:
Records: 8
RLE repeat: 3 (37.5%) [2,019 samples]
Full stack: 5 (62.5%)
Suffix match: 0 (0.0%)
Pop-push: 0 (0.0%)
Frame Efficiency:
Frames written: 8
Frames saved: 12,039 (99.9%)
Bytes (pre-zstd): 6.0 KB
Binary profile written to repro.bin (2024 samples)
Replaying 2024 samples from repro.bin
Sample interval: 1000 us
Compression: zstd
[████████████████████████████████████████] 100.0% (2,024/2,024)
Heatmap output written to repro-report/
- Index: repro-report/index.html
- 1 source file analyzed
Replayed 2024 samples
if we will try to open the html report "missed samples" and "error rate" will always be N/A, "duration" will always be 0.0 (and without a unit of measurement)
Actual:
Expected:
Proposed fix: add set_replay_stats method for HeatmapCollector
I will work on the fix for that
CPython versions tested on:
CPython main branch
Operating systems tested on:
macOS
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