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mempool: Add mempool tracepoints #26531

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merged 1 commit into from Mar 20, 2023
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mempool: Add mempool tracepoints #26531

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50 changes: 50 additions & 0 deletions contrib/tracing/README.md
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Expand Up @@ -286,3 +286,53 @@ Spent a05880b8c77971ed0b9f73062c7c4cdb0ff3856ab14cbf8bc481ed571cd34b83:1
Added eb689865f7d957938978d6207918748f74e6aa074f47874724327089445b0960:0 5589696005 2094513 No
Added eb689865f7d957938978d6207918748f74e6aa074f47874724327089445b0960:1 1565556 2094513 No
```

### mempool_monitor.py

A BCC Python script producing mempool statistics and an event log. Based on the
`mempool:added`, `mempool:removed`, `mempool:replaced`, and `mempool:rejected`
tracepoints.

Statistics include incidence and rate for each event type since the script was
started (`total`) as well as during the last minute (`1 min`) and ten minutes
(`10 min`). The event log shows mempool events in real time, each entry
comprising a timestamp along with all event data available via the event's
tracepoint.

```console
$ python3 contrib/tracing/mempool_monitor.py ./src/bitcoind
```

```
Mempool Monitor
Press CTRL-C to stop.

┌─Event count───────────────────────┐ ┌─Event rate──────────────────────────┐
│ Event total 1 min 10 min │ │ Event total 1 min 10 min │
│ added 1425tx 201tx 1425tx │ │ added 4.7tx/s 3.4tx/s 4.7tx/s │
│ removed 35tx 4tx 35tx │ │ removed 0.1tx/s 0.1tx/s 0.1tx/s │
│ replaced 35tx 4tx 35tx │ │ replaced 0.1tx/s 0.1tx/s 0.1tx/s │
│ rejected 0tx 0tx 0tx │ │ rejected 0.0tx/s 0.0tx/s 0.0tx/s │
└───────────────────────────────────┘ └─────────────────────────────────────┘

┌─Event log────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ 13:10:30Z added f9064ca5bfc87cdd191faa42bf697217cd920b2b94838c1f1192e4f06c4fd217 with feerate 8.92 sat/vB (981 sat, 110 vbytes) │
│ 13:10:30Z added 53ffa3afbe57b1bfe423e1755ca2b52c5b6cb4aa91b8b7ee9cb694953f47f234 with feerate 5.00 sat/vB (550 sat, 110 vbytes) │
│ 13:10:30Z added 4177df5e19465eb5e53c3f8b6830a293f57474921bc6c2ae89375e0986e1f0f9 with feerate 2.98 sat/vB (429 sat, 144 vbytes) │
│ 13:10:30Z added 931a10d83f0a268768da75dc4b9e199f2f055f12979ae5491cc304ee10f890ea with feerate 3.55 sat/vB (500 sat, 141 vbytes) │
│ 13:10:30Z added 4cf32b295723cc4ab73f2a2e51d4bb276c0042760a4c00a3eb9595b8ebb24721 with feerate 89.21 sat/vB (12668 sat, 142 vbytes) │
│ 13:10:31Z replaced d1eecf9d662121322f4f31f0c2267a752d14bb3956e6016ba96e87f47890e1db with feerate 27.12 sat/vB received 23.3 seconds ago (7213 sat, 266 vbytes) with c412db908│
│ 9b7ed53f3e5e36d2819dd291278b59ccaabaeb17fd37c3d87fdcd57 with feerate 28.12 sat/vB (8351 sat, 297 vbytes) │
│ 13:10:31Z added c412db9089b7ed53f3e5e36d2819dd291278b59ccaabaeb17fd37c3d87fdcd57 with feerate 28.12 sat/vB (8351 sat, 297 vbytes) │
│ 13:10:31Z added b8388a5bdc421b11460bdf477d5a85a1a39c2784e7dd7bffabe688740424ea57 with feerate 25.21 sat/vB (3554 sat, 141 vbytes) │
│ 13:10:31Z added 4ddb88bc90a122cd9eae8a664e73bdf5bebe75f3ef901241b4a251245854a98e with feerate 24.15 sat/vB (5072 sat, 210 vbytes) │
│ 13:10:31Z added 19101e4161bca5271ad5d03e7747f2faec7793b274dc2f3c4cf516b7cef1aac3 with feerate 7.06 sat/vB (1080 sat, 153 vbytes) │
│ 13:10:31Z removed d1eecf9d662121322f4f31f0c2267a752d14bb3956e6016ba96e87f47890e1db with feerate 27.12 sat/vB (7213 sat, 266 vbytes): replaced │
│ 13:10:31Z added 6c511c60d9b95b9eff81df6ecba5c86780f513fe62ce3ad6be2c5340d957025a with feerate 4.00 sat/vB (440 sat, 110 vbytes) │
│ 13:10:31Z added 44d66f7f004bd52c46be4dff3067cab700e51c7866a84282bd8aab560a5bfb79 with feerate 3.15 sat/vB (448 sat, 142 vbytes) │
│ 13:10:31Z added b17b7c9ec5acfbbf12f0eeef8e29826fad3105bb95eef7a47d2f1f22b4784643 with feerate 4.10 sat/vB (1348 sat, 329 vbytes) │
│ 13:10:31Z added b7a4ad93554e57454e8a8049bfc0bd803fa962bd3f0a08926aa72e7cb23e2276 with feerate 1.01 sat/vB (205 sat, 202 vbytes) │
│ 13:10:32Z added c78e87be86c828137a6e7e00a177c03b52202ce4c39029b99904c2a094b9da87 with feerate 11.00 sat/vB (1562 sat, 142 vbytes) │
│ │
└──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
```