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Re: Performance measurement

From: Stefano Garzarella
Subject: Re: Performance measurement
Date: Thu, 2 Apr 2020 10:06:15 +0200


On Wed, Apr 01, 2020 at 11:33:26PM +0200, sterbl.ta--- via wrote:
> Sorry I am not sure if this is the right place to ask but this is the only 
> mailing list that most relevant. Apologize if this is not, and please let me 
> know which place I should check. Thank you. 
> My main question is I want to measure the boot time of image running using 
> qemu. And I come across to this repo 
> https://github.com/stefano-garzarella/qemu-boot-time#how-to-use which can 
> achieve my goal. 
> So I try replacing qemu startup command in How to use section with mine below
> qemu-system-x86_64 -enable-kvm \
>     -drive "file=disk.img,if=virtio" -drive 
> "file=seed.img,if=virtio,format=raw"  \
>     -device virtio-net-pci,netdev=net00 --netdev type=user,id=net00 \
>     -m 512 -nographic
> perf record command generates qemu_perf.data file without a problem. But the 
> problem raises when trying to run the command 
> perf script -s qemu-boot-time/perf-script/qemu-perf-script.py -i \    
> qemu_perf.data
> It throws 
> in trace_beginTraceback (most recent call last):  File 
> "qemu-boot-time/perf-script/qemu-perf-script.py", line 195, in kvm__kvm_entry 
>    if (events.traces[pid].qemu_init_end != 0):AttributeError: 
> 'collections.defaultdict' object has no attribute 'qemu_init_end'Fatal Python 
> error: problem in Python trace event handler
> Even after export env variable PERF_EXEC_PATH to 
> /path/to/linux-source-5.4/tools/perf (where Core.py, Utils.py files located 
> in linux kernel source 5.4)
> So my questions:
> How can I fix this?

I'm the author of the script.

Can you send me the entire output of 'perf script' and the
qemu_perf.data file?

Did you enable the kvm events following the "Prerequisites" section?


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