[CAMEL-19060] Scalability ceiling: seda

• Type: Task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.18.5, 4.0-M1
• Fix Version/s: 4.0-RC1
• Estimated Complexity: Unknown
• Assignee: Otavio Rodolfo Piske
• Reporter: Otavio Rodolfo Piske
• Created: 16/Feb/23 07:32
• Updated: 31/Aug/23 09:05
• Resolved: 25/May/23 11:07

Description

When using the Seda producer/consumer on a large core count machine, it seems that Camel's throughput peak at around 9 producer / 9 consumer threads and after that starts to decrease [1]. This seems to indicate some kind of coherence issue - the cost to keep the threads coherent exceeds the system's ability to handle the load / use the system's free capacity.

 

1. This, of course, taking in consideration that the thread pool had been adjusted and the machine has enough capacity. Both of which were true.

The attachments contains `perf` reports of the analysis of Camel 3.18.5, but similar patterns also happen w/ 4.0.0-M1. In particular, note the low "Instruction per cycle" reported on the attachment perf-stats.txt and the high incidence of Last Level Cache (LLC) misses to Remote Cache (HITM) in the attachment stats.txt.

Issue Links

• relates to: CAMEL-19815 camel-seda: cached queue reference can become invalid
• links to: GitHub Pull Request #9429
• links to: GitHub Pull Request #9431
• links to: GitHub Pull Request #9433
• links to: GitHub Pull Request #9452
• links to: GitHub Pull Request #10010
• links to: GitHub Pull Request #10076