I understood about profiler works, interpret the flame graphs, types of flame graphs. after watched this video I ordered the 'System Performance' and 'BPF programming guide' books which are written by Brendan Gregg. Thanks.
We've been troubleshooting Jenkins issues for almost 4 months now. The "top" tool shows kworker is at 100% cpu utilization. We can't figure out what the culprit really is. Using strace to attach to the process doesn't do anything. Jenkins java process is hung or frozen. Any tips on how we should debug this issue?
How do you display situation when a function appears on different call stacks? E.g. if F() does 100% of the job in your app, but 50% times it is called from A(), and 50% times it is called from B()? What would flame graph for this setup be?
Quick explanation to flame graph starts at 12:47
I understood about profiler works, interpret the flame graphs, types of flame graphs. after watched this video I ordered the 'System Performance' and 'BPF programming guide' books which are written by Brendan Gregg. Thanks.
Awesome, thanks!
Great talk, thanks.
We've been troubleshooting Jenkins issues for almost 4 months now. The "top" tool shows kworker is at 100% cpu utilization. We can't figure out what the culprit really is. Using strace to attach to the process doesn't do anything. Jenkins java process is hung or frozen. Any tips on how we should debug this issue?
Thanks for sharing ! You rock
What happens when function C is called by function A and also by function B? I kind of see C parallel to A and B but not on top of A and B.
How do you display situation when a function appears on different call stacks? E.g. if F() does 100% of the job in your app, but 50% times it is called from A(), and 50% times it is called from B()? What would flame graph for this setup be?
good question. I am no flamegraph expert so just wonder if you've found an answer yet?
Nope, still mystery to me :)
Mikhail Matrosov then you get 2 towers A-F, B-F, each with 50% width
Legendary
Good stuff!
good stuff.
Do you have any plans to have Netflix in North Korea and Syria ?