Building a QNX 7 Desktop

Post by Grazester » Sun, Apr 30, 2017, 4:50 PM UTC

feld wrote: post #55

tyingq wrote: post #48

Earlier quoted context omitted.

> Cisco doesn't use QNX Other than on their most expensive, powerful routers. https://en.wikipedia.org/wiki/IOS_XR

Wow, I forgot that even existed. Here I was thinking of every switch, firewall, and routing product they've done except this line. I guess it doesn't help that I've never had a reason to touch one as every carrier grade router I've used has been Juniper. I wonder why they went with a whole new platform based on QNX when you don't benefit from a realtime OS if all the packets are moved in hardware? Must be something a…

Post by fest » Sun, Apr 30, 2017, 5:29 PM UTC

terminalcommand wrote: post #56

fest wrote: post #51

Earlier quoted context omitted.

While I haven't used Erlang, I have used other systems with nice messaging systems (PX4 autopilot and ROS) so I will try: 1) Data is passed between threads/processes using a message bus (essentially, a queue). This means, no need to synchronize data access, as every subscriber gets it's own message copy. 2) Suddenly, you need access to certain data from another module. If the program was architected as regular class…

I don't have much experience in the field. Are you searching for something like Apache Kafka? On the web page it states that Apache Kafka is a distributed streaming platform. Kafka has four core APIs: The Producer API allows an application to publish a stream of records to one or more Kafka topics. The Consumer API allows an application to subscribe to one or more topics and process the stream of records produced to…

Post by Animats » Sun, Apr 30, 2017, 5:42 PM UTC

secure wrote: post #58

Animats wrote: post #10

That's nice, but sad. Until QNX 6.5, there was a full windowed desktop environment, with the Photon window manager. I used QNX on the desktop when developing a DARPA Grand Challenge vehicle from 2003-2005. Back then, at QNX 6.21, you had the window manager, the Eclipse development environment, Firebird (Firefox before the name change), and Thunderbird. Then QNX marketing cut off the free version, and all the free sof…

> The desktop environment had very consistent performance, because QNX doesn't swap. (It's a real time system, after all.) Is it possible to configure Linux towards this sort of behavior? I disabled swap, and whenever my memory is exhausted aggressively (think a runaway program writing to /tmp, which is on tmpfs), my system comes to a grinding halt. How does QNX deal with memory pressure?

Post by feld » Sun, Apr 30, 2017, 6:00 PM UTC

Grazester wrote: post #61

feld wrote: post #55

Earlier quoted context omitted.

Wow, I forgot that even existed. Here I was thinking of every switch, firewall, and routing product they've done except this line. I guess it doesn't help that I've never had a reason to touch one as every carrier grade router I've used has been Juniper. I wonder why they went with a whole new platform based on QNX when you don't benefit from a realtime OS if all the packets are moved in hardware? Must be something a…

"I've still yet to meet someone who actually prefers Cisco over Juniper MX. I wonder who is buying these?" You have met my ex-boss.He had no reason to necessarily prefer Cisco other than that's all he was accustomed to.

Post by asdaksdhksajd » Sun, Apr 30, 2017, 6:33 PM UTC

swiley wrote: post #37

geocar wrote: post #28

Earlier quoted context omitted.

It's not exactly because ssh can't forward `/dev/ttyS0` It takes more than someone just adding a special adapter to produce such an interface, because you also have to change all of the modem applications that consume the `/dev/ttyS0` interface to also consume the unix-domain or TCP-based interface. Meanwhile with Qnet, an application simply goes open("/net/node1/dev/ser1") and gets the modem attached to node1. Plan9…

Linux has 9p2000 support, I've never heard of people actually using it to export devices over the network though. Fuse also has support for ioctls and other weirdness so it's not impossible for something like sshfs to forward /dev over the network.