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colcon build Slow? What Overlays, COLCON_IGNORE and –symlink-install Actually Save, Measured on ROS 2 Jazzy

On ROS 2 Jazzy, a no-change colcon build still cost time per package, and switching one CMake flag cost more than ignoring two packages saved.

더 읽기 colcon build Slow? What Overlays, COLCON_IGNORE and –symlink-install Actually Save, Measured on ROS 2 Jazzy
colcon build –executor sequential still runs make -jN: measured compilers, memory and build time

In measured runs, colcon –executor sequential built one package at a time but kept make -j2; only MAKEFLAGS=-j1 got it down to one compiler.

더 읽기 colcon build –executor sequential still runs make -jN: measured compilers, memory and build time
ROS 2 Liveliness vs Deadline: Which One Tells You a Sensor Topic Stopped?

On ROS 2 Jazzy with Fast DDS, a stalled sensor topic fired only deadline events; Automatic liveliness stayed alive until the driver process was killed.

더 읽기 ROS 2 Liveliness vs Deadline: Which One Tells You a Sensor Topic Stopped?
ROS 2 ‘Message Filter dropping message’: Find the Mismatched Clock with One Subtraction

Subtract the latest tf stamp from the laser stamp: a gap of billions of seconds, and its sign, shows which ROS 2 node has use_sim_time set wrong.

더 읽기 ROS 2 ‘Message Filter dropping message’: Find the Mismatched Clock with One Subtraction
ROS 2 transient_local: how many old messages does a late subscriber actually get? (measured)

Depth behaved as documented. A 0.45 s lifespan delivered 4 samples instead of 5 in every run, because history arrives after discovery.

더 읽기 ROS 2 transient_local: how many old messages does a late subscriber actually get? (measured)

ROS 2 troubleshooting guide · How these articles are made