Viewing profile — brendangregg

I'm hoping for more Troughton too some day. And speaking of Jamie: https://www.brendangregg.com/blog/images/2025/brendan_hines....

Thanks, I never saw the Tech Crunch parodies before. I also didn't use the words "make/making the world a better place". I actually said "it's about saving the planet" based on all…

Given the widely reported issue of AI environmental cost, and being among the top people in the world who can fix it, I don't feel comfortable with _inaction_. I can reduce datacen…

No, that's not what they say.

When did I say I don't think comp is important?

As an engineer I can't comment on future company predictions. It sounds like a question for Sam Altman, as he has discussed risks in the past. My wife was paying for ChatGPT before…

Again, many comments here saying I only care about the money, and while comp is an important factor I think it characterizes me as someone I'm not, and forgets what I've been doing…

To answer a few people at once: I did mention compensation as a factor in the post, but I didn't elaborate details, so easy to miss. Comp is important of course, but so are the oth…

Funny to see this fixed in 2023 and the side effects. Back in 2004, before I focused on performance, I did some security work including inter-keystroke latency analysis of captured…

Yeah, different numbers, 110 customer meetings, the other post tracked 1-6am meetings. I'm glad I tracked 1-6am meetings since I've shared that number when people think that remote…

Right, laser 300 was called the VZ300 here. I'm out of desk space so I had to put the VZ300 on a stand above my C64C. Maybe AI can finally help me code some C64 and VZ games. :-)

I like to measure things. In real life and on computers. But I also have a couple of work reasons for it: As a remote worker, I'm under extra pressure to prove that remoteness work…

I actually only just got the C64C and was surprised I could get it to fit on my desk. C64Cs are massive. Now to connect it to some display...

Right, this kind of job can improve, and should improve. But right now there's talk of ending remote work entirely, without considering that people have been making the effort for …

Thanks, glad it's useful!

To everyone building these things: Please add a disclaimer to say something like: "This is not a vulnerability: eBPF currently requires root access to do this. Also, eBPF makes thi…

I could just regenerate these heat maps with 60 rows instead of 50. I'm limited by the sampling rate that was captured in the profile data file. To provide even more resolution (so…

The origin problem for flame graphs was MySQL server performance involving dozens of threads: as a timeline view you need dozens of timelines, one for each thread, since if you ren…

Nice tool. Looks like it uses what we now call a "flame chart" (not a flame graph). I don't know if it ever had an original name, but I've seen these in tools from at least the 199…

The answer has always been in the source of flamegraph.pl: # This was inspired by Neelakanth Nadgir's excellent function_call_graph.rb # program, which visualized function entry an…

Microsoft have been driving the work to make eBPF an IETF industry standard.

Yes, we know eBPF must attach to equivalent events to Linux, but given there are already many event sources and consumers in Windows, the work is to make eBPF another consumer -- n…

Right, and we wanted to talk about all security solutions and not make this about one company. We also wanted to avoid shaming since they have been seriously working on eBPF adopti…

Right; disabling eBPF doesn't solve this. And the bigger point is that this kind of eBPF is still super-user only. Apart from the more exotic facilities, the critical facilities th…

My preference is tools that give a rolling output as it let you capture the time-based pattern and share it with others, including in JIRA tickets and SRE chatrooms, whereas top's …