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High CPU usage at VMS start or even randomly when in background

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Hexaae
Posts: 12
Joined: July 13, 2023 - 07:51
High CPU usage at VMS start or even randomly when in background
by Hexaae » July 13, 2023 - 07:55

Ciao,
volevo segnalare strani problemi di utilizzo di CPU di VMS in background. A volte capita dopo il boot di Win11, a volte a random trovo il task (sempre in background) con un alto utilizzo di CPU...

Qui in foto un esempio dopo il boot di Win11:

[Manually translated by admin...]

Hi,
I'd like to report a strange CPU usage bug when VMS is running on background. Sometimes it happens just after the boot (Win11), the process (in background) has an high CPU usage...

Below a screenshot after Win11 boot:

Se esco dal programma e lo riavvio manualmente la smette (ma può ancora ricapitare in background di trovarlo con un alto utilizzo di CPU). Dimmi come posso aiutare con log etc. mentre è così...

VirtualMIDISynth_debug_report.txt

Gaming Laptop ASUS GL703GS (BIOS 310)
32GB (dual channel) DDR4 2666MHz
CPU i7-8750H (iGPU unavailable)
GTX 1070 8GB (Max-P, 10DE 1BE1 - 1043 1011, GP104 A1, vbios 86.04.7c.00.24, Samsung VRAM)
Screen: 144Hz g-sync AUO B173HAN03.2 [AUO329D] 1080p (1920x1080)
2nd Screen through DisplayPort: 144Hz adaptive-sync Mi UWQHD [XMI3444] 3440x1440
Audio: Realtek HD Audio (ALC295 chipset)
Hard disks: NVMe Samsung, SSD Crucial
USB Blu-Ray 4K drive: Archgon Star MD-8102P-U3YC-UHDB (Pioneer BDR-UD04)
Bluetooth: 5.1 (AC 9560)
Controllers: Hori Fighting Stick Mini, XBox One Bluetooth controller, ROG Strix Carry Wireless-BT mouse
Microsoft Surface Headphones 2 BT

Hexaae
Posts: 12
Joined: July 13, 2023 - 07:51
Re: High CPU usage at VMS start or even randomly when in background
by Hexaae » July 13, 2023 - 08:28

Task details:

image

coolsoft
Posts: 1978
Joined: March 25, 2012 - 01:19
Re: High CPU usage at VMS start or even randomly when in background
by coolsoft » July 13, 2023 - 08:37

(mi sono permesso di tradurre il post originale, in modo che altri eventuali utenti Win11 con lo stesso problema possano accodarsi...)

Just a confirmation: how was CPU usage at the moment you've took the VirtualMIDISynth_debug_report.txt file? High or normal?
I'd like to exclude that some "unexpected" MIDI client is randomly connecting to VMS...

Hexaae
Posts: 12
Joined: July 13, 2023 - 07:51
Re: High CPU usage at VMS start or even randomly when in background
by Hexaae » July 13, 2023 - 08:42

Always high CPU usage even while using program's UI (looking at current config, log report etc.). Seems totally random like a cpu core stuck on something with VMS...

Hexaae
Posts: 12
Joined: July 13, 2023 - 07:51
Re: High CPU usage at VMS start or even randomly when in background
by Hexaae » July 13, 2023 - 15:38

This is normal behaviour (0% CPU usage in background):

ProcessExplorer.log

When it happens, I'll try to dump again this log, in the hope this will help you figure out what's wrong... Maybe is a sporadic conflict with ASUS Sonic Studio 3 and Nahimic at launch...

coolsoft
Posts: 1978
Joined: March 25, 2012 - 01:19
Re: High CPU usage at VMS start or even randomly when in background
by coolsoft » July 13, 2023 - 16:21

It should be great if you could use Sysinternals Process Explorer.

It's... Task Manager on steroids 😉.

Start it (no need to install), double click on VirtualMIDISynth.exe process then open the Threads tab and sort list by CPU usage; that could help me finding the thread that's hogging the CPU.

Hexaae
Posts: 12
Joined: July 13, 2023 - 07:51
Re: High CPU usage at VMS start or even randomly when in background
by Hexaae » July 13, 2023 - 18:12

Yeah, the log above comes from Process Explorer ;)

Next time I'll inspect the "stuck" task of VMS deeper...

Hexaae
Posts: 12
Joined: July 13, 2023 - 07:51
Re: High CPU usage at VMS start or even randomly when in background
by Hexaae » July 14, 2023 - 08:56
coolsoft wrote:

... and sort list by CPU usage; that could help me finding the thread that's hogging the CPU.

Just to be clear: when it happens there is no other thread with high CPU usage apart VMS, until you quit and restart it. That's the strange thing. Opening CPU monitor I see 1/12 core is stuck at 66% (??) when this happens, so it looks like a compiler issue (?) or bug in the code.

P.S.

I'm also testing some compatibility modes using Compatibility Administrator (AKA MS Compatibility Toolkit...) for its task and I can't reproduce it anymore (consider it was a rare issue anyway) with these shims enabled (proc count lie = 4):

image

coolsoft
Posts: 1978
Joined: March 25, 2012 - 01:19
Re: High CPU usage at VMS start or even randomly when in background
by coolsoft » July 14, 2023 - 11:17
Hexaae wrote:
when it happens there is no other thread with high CPU usage apart VMS

Do you mean "no other process", right?

I'm not excluding a bug in VMS; that's why I'd like to know which of the threads into VMS is hogging the CPU (it starts a lot of them: IPC queue IO, MIDI watchdogs, UI refresh, updates...).
Since this bug is not so easily reproducible, it could be a good starting point for me. 😉

Hexaae
Posts: 12
Joined: July 13, 2023 - 07:51
Re: High CPU usage at VMS start or even randomly when in background
by Hexaae » July 14, 2023 - 11:58

Yes, sorry "process" is more correct.

Will report ASAP when I'll be able to reproduce it again...

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