From 7d28bc6a2bcf43a28ccf81212637134c9a80deee Mon Sep 17 00:00:00 2001
From: Divyansh Sharma <160004774+ddivyanshsharmaa@users.noreply.github.com>
Date: Sun, 1 Nov 2026 20:03:24 +0530
Subject: [PATCH] ci(coverage): use the sysmon tracing core to speed up the
 coverage job

On Python 3.12 the sysmon core counted exactly the same lines as the default
core (13958 of 16208, 86.118%) and cut the test time from 721 s to 521 s on one
run and from 1486 s to 483 s on another, on ubuntu-latest.

Refs #898
---
 .github/workflows/ci.yml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 611a1a4e9..0d7f56019 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -168,6 +168,10 @@ jobs:
           key: robot-descriptions-v2-${{ runner.os }}-3.12
 
       - name: Run coverage
+        env:
+          # Python 3.12's lighter tracing core (sys.monitoring). It counts exactly the
+          # same lines as the default core here, in far less time (#898).
+          COVERAGE_CORE: sysmon
         run: pytest tests/ --ignore=tests/test_blocks.py --cov=roboticstoolbox --cov-report=xml:coverage.xml -q
 
       - uses: codecov/codecov-action@303a32d7a59b442fa8d48b6a1cc6825c09c847a5  # v7.1.1