Dates and Events: |
OSADL Articles:
2023-11-12 12:00
Open Source License Obligations Checklists even better now
Import the checklists to other tools, create context diffs and merged lists
2022-07-11 12:00
Call for participation in phase #4 of Open Source OPC UA open62541 support project
Letter of Intent fulfills wish list from recent survey
2022-01-13 12:00
Phase #3 of OSADL project on OPC UA PubSub over TSN successfully completed
Another important milestone on the way to interoperable Open Source real-time Ethernet has been reached
2021-02-09 12:00
Open Source OPC UA PubSub over TSN project phase #3 launched
Letter of Intent with call for participation is now available |
COOL - Compact OSADL Online Lectures - November 2024 edition
OSADL talks at ESE Embedded Software Engineering Kongress
COOL - Compact OSADL Online Lectures - December 2024 edition
HOWTO: Latency Generator (used for calibration purposes)
Quick HOWTO
Download the file archive blocksys-0.5.tgz and type:
tar -xf blocksys-0.5.tgz
cd blocksys-0.5
make
modprobe blocksys
Then run the application
./mklatency
or, alternatively, a shell script with the same functionality
./mklatency.sh
Check out the generated latency:
tail /var/log/messages
[..]
[..] kernel: blocksys: CPU #0 will be blocked for 2000000 nops
[..] kernel: blocksys: CPU #0 blocked about 1270 us
You may then wish to check and to calibrate latency analysis tools such as cyclictest or the OSADL Latency Measurement Box by executing mklatency or mklatency.sh while these tools are running. The CYCLES constant in the mklatency.c source file and the $nops shell variable in mklatency.sh define the duration of the latency.
