Can not load trace when using current trace-cmd master

[subdiff]

Following error message appears in GPUVis log:

[Error] handle_options: unknown option 11
[Error] read_trace_file: setjmp error called for trace_06-15-2020_20-11-53.dat.
[Error] load_trace_file(trace_06-15-2020_20-11-53.dat) failed.

[subdiff]

Repo: https://git.kernel.org/pub/scm/utils/trace-cmd/trace-cmd.git Checkout at: 27ee7e41e5f5e3f134ce985fec03b1386f30e45f

[Oschowa]

This issue seems to back with a different error message when trying to open traces captured with trace-cmd 3.0.3:

[Error] read_header_files: header_page not found.
[Error] read_trace_file: setjmp error called for trace.dat

Rolling back to trace-cmd 2.9.7 makes it work again.

[mikesart]

Can you try the libtraceevent branch and see if it still happens? And if it does, is it possible to send me a trace that fails? Thanks Oschowa.

[Oschowa]

I'm still getting the same error on the libtraceevent branch, here's a sample trace: trace_05-06-2022_17-19-23.zip

[mikesart]

Apologies for the late reply - been a bit slammed at work. So it looks like they added a compressed page format so this bit of code:

337├───> if ( memcmp( buf, "header_page", 12 ) != 0 ) 338│ die( handle, "%s: header_page not found.\n", func );

Is failing because buf is "zstd". Do you have a way to disable this compression with the latest trace-cmd? I'll look at adding this but will take a bit of time. Thanks Oschowa.

[mikesart]

Got Oschowa's zstd sample trace loading in gpuvis. This is all on Linux only right now cause I had to pull in a lot of the libtracefs, trace-cmd, and libtraceevent code and all this stuff relies a lot on gcc extensions and Linux header files, functions, etc.

Lot of work still to go to verify older traces (some of which aren't loading right now) and make sure new ones load correctly and with decent performance.

Then have to get all this working on Windows. :sob:

[YellowOnion]

Can you push the branch? would be nice for us linux users to be able to use :P

[mikesart]

Pushed it to zstd branch:

https://github.com/mikesart/gpuvis/tree/zstd

And sorry - just recently started a new job and have been kinda slammed...

[lostgoat]

trace-cmd Version 3.1.5 has been released with file version 7 as the default for recordings.

As a workaround, a tracefile can be converted to version 6 to be opened with gpuvis using the command:

trace-cmd convert -i trace-7.dat -o trace-6.dat --file-version 6

[uis246]

Wow, zstd makes trace files 6 times smaller. I hope it will be supported here soon. Thanks lostgoat for workaround.