magic-trace

> AMD chips don't have an equivalent to Intel PT. We'd love to add support as soon as they make one. (2022) [1] > since 2013, Intel offers a feature called "intel processor tracing [2] > [not answered] > When will AMD cpus introduce Intel-PT tech or the Intel branch trace store feature? (2024) [3] > [not answered] Is Intel-PT over-engineered and not really needed in practice? [1] https://github.com/janestreet/magic-trace/wiki/How-could-mag... [2] https://community.amd.com/t5/pc-processors/amd-ipt-intelpt-i... [3] https://community.amd.com/t5/pc-processors/will-amd-cpus-hav...

tbh I find magic trace to be more useful https://github.com/janestreet/magic-trace

I really like magic-trace [0]. https://github.com/janestreet/magic-trace Not that the exact tracing relies on Intel PT - support for AMD was added recently but uses perf so suffers from the same sampling/skew issues, but is still very useful.

Would love to see this integrate with magic trace [1]. I'll need to look at the code for the flamegraph plugin, because handling nanosecond timestamps in flamegraphs seems to break most tools due to float precision. (1) https://github.com/janestreet/magic-trace

I really hope he can work with cloud vendors and Intel to make Processor Trace a more popular and easier to use capability. It's unfortunate how https://github.com/janestreet/magic-trace and PMUs in general can't be used by lots of people using cloud VMs.

We are similarly sad about how unavailable Intel PT is in VMs. In 2022, being unavailable on Macs and VMs raises the barrier to entry extraordinarily high for many people in our target audience. Not sure if working outside of work is your cup of tea, but we've found Intel NUCs to be <$1000 and an unobtrusive way to play with these features at home. Good point about overhead. I've moved the 2%-10% number front and center, and wrote up a bit more detail about where that comes from in a new wiki page: https://github.com/janestreet/magic-trace/wiki/Overhead We'll think about adding flame graphs. We unfortunately have little experience writing responsive web UIs, the excellent Perfetto developers did all of the heavy lifting on that front. But who knows, maybe an enterprising Open Source Contributor could help us out. I see Matt Godbolt was as

Looks like you can use magic-trace with a perfetto based UI. https://github.com/janestreet/magic-trace

Broadwell works, Skylake or later works better. We go into more detail about what platforms we support and why in https://github.com/janestreet/magic-trace/wiki/Supported-pla...

Absolutely, check out https://github.com/janestreet/magic-trace#privacy-policy and https://github.com/janestreet/magic-trace/wiki/Setting-up-a-.... With a bit of extra configuration, magic-trace can host its own UI locally. You just need to build the UI from source, and point magic-trace to it (via an environment variable).

Yes, in fact this is how we've been narrowing down performance problems in it and its dependencies :) - https://github.com/let-def/owee/issues/23 - https://github.com/janestreet/magic-trace/issues/93

Apparently it works with virtualization at least with KVM according to https://github.com/janestreet/magic-trace/wiki/Supported-pla... & https://github.com/janestreet/magic-trace/wiki/How-could-mag......

They mention that in the privacy section: https://github.com/janestreet/magic-trace#privacy-policy

You may also be interested in this wiki page: <https://github.com/janestreet/magic-trace/wiki/Supported-pla...> Intel PT has a bunch of rough edges that we've tried to paper over in magic-trace, but the gritty caveats are documented in the wiki.

We have a bit more color on compatibility in general up on <https://github.com/janestreet/magic-trace/wiki/How-could-mag...> for those interested.