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CPU spikes with some soft synths

Configure and optimize you computer for Audio.

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Ambient Indigo
KVRer
 
11 posts since 2 Oct, 2013, from Helsinki, Finland

Postby Ambient Indigo; Tue May 13, 2014 8:00 am CPU spikes with some soft synths

I'm getting some CPU spikes using a couple of soft synths notably Diva and Omnisphere.

Will extra RAM help the situation, or is more the processor?

I have a PC with these specs :

HP Z420, Intel Xenon E5-1620@ 3600MHz, 8GB RAM,
Windows 7 Pro 64-bit
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pinkpanther
KVRist
 
148 posts since 30 Jun, 2013

Postby pinkpanther; Tue May 13, 2014 8:06 am Re: CPU spikes with some soft synths

It's Diva fault. You need a year 2020 CPU to run it smoothly.
Ambient Indigo
KVRer
 
11 posts since 2 Oct, 2013, from Helsinki, Finland

Postby Ambient Indigo; Tue May 13, 2014 8:53 am Re: CPU spikes with some soft synths

I know Diva is quite CPU intensive. I think I've got a fairly powerful PC, but it doesn't handle everything.

Would upgrading to 16GB RAM help, or is it not a RAM issue?
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pinkpanther
KVRist
 
148 posts since 30 Jun, 2013

Postby pinkpanther; Tue May 13, 2014 9:06 am Re: CPU spikes with some soft synths

No, not RAM issue at all... Diva is an amazing CPU hog so no surprises here. Try tweaking "quality" settings or that multicore thing.
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murnau
KVRAF
 
2703 posts since 13 Jan, 2005, from Deutschland

Postby murnau; Tue May 13, 2014 9:14 am Re: CPU spikes with some soft synths

pinkpanther wrote:No, not RAM issue at all... Diva is an amazing CPU hog so no surprises here. Try tweaking "quality" settings or that multicore thing.


you read that he have problems with omnisphere as well? saying that 8gb should be enough. i think it could be a driver or system issue. it could be everything.
“Our virtues and our failings are inseparable, like force and matter. When they separate, man is no more” ― Nikola Tesla
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pinkpanther
KVRist
 
148 posts since 30 Jun, 2013

Postby pinkpanther; Tue May 13, 2014 9:20 am Re: CPU spikes with some soft synths

Yes but Diva seems the most suspicious CPU killer. Once she is toned down we can investigate the rest :borg:
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Urs
u-he
 
17049 posts since 7 Aug, 2002, from Berlin

Postby Urs; Tue May 13, 2014 9:23 am Re: CPU spikes with some soft synths

Ambient Indigo wrote:I know Diva is quite CPU intensive. I think I've got a fairly powerful PC, but it doesn't handle everything.

I think your CPU should be just fine :)

It would be great if you could describe the kind of CPU spikes you're getting, e.g. randomly, on note start, with certain presets, high notes, low notes, with certain effects enabled, multicore on or off.

Also, we have posted a build in our support forum that measures CPU internally with a pretty precise clock, and can log this into a file. Just download the version from viewtopic.php?f=31&t=409030 and craete an empty text file called Diva.log (without .txt ending) on your desktop. Start your host, play away until the spikes occur and maybe send us the file to support at u-he dot com.

Cheers,

- Urs
UltraJv
KVRAF
 
5837 posts since 30 Dec, 2004, from London uk

Postby UltraJv; Tue May 13, 2014 9:24 am Re: CPU spikes with some soft synths

As already stated, RAM isn't the problem. You don't mention a soundcard - its a big part of things. A decent soundcard with good ASIO drivers works wonders. Always worth doing the usual for any DAW :

https://www.steinberg.net/nc/en/support ... -daws.html

Always worth running DPC latency checker as well to see how your system is running for low latency audio :

http://www.thesycon.de/deu/latency_check.shtml
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fluffy_little_something
KVRAF
 
3049 posts since 5 Jun, 2012

Postby fluffy_little_something; Tue May 13, 2014 9:53 am Re: CPU spikes with some soft synths

What's an Intel Xenon? 8)
In case you mean Xeon, aren't those server cpu's? Are they ideal for that kind of application? Just wondering...
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jethrobull
KVRian
 
1186 posts since 5 Jun, 2011, from England,UK

Postby jethrobull; Tue May 13, 2014 9:57 am Re: CPU spikes with some soft synths

fluffy_little_something wrote:aren't those server cpu's?

Yes :wink:
All the audience cares about is being fed a stream of songs that they know and can sing along to.
.......................
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pinkpanther
KVRist
 
148 posts since 30 Jun, 2013

Postby pinkpanther; Tue May 13, 2014 10:13 am Re: CPU spikes with some soft synths

Diva runs almost fine on my E7-8891 v2 Xeon. Maybe Diva 2 is better optimized.
Ambient Indigo
KVRer
 
11 posts since 2 Oct, 2013, from Helsinki, Finland

Postby Ambient Indigo; Tue May 13, 2014 11:18 am Re: CPU spikes with some soft synths

Thanks for the feedback guys

Urs, I will check out that other thread and report. The spikes happen only on certain patches. I was using the "Great" accuracy, with Multicore button off - turning the Multicore ON made a big difference - no spikes so far with that ON.

Yes, its a Xeon, not Xenon. Build was recommended for use with my DAW, Sonar.

Soundcard is Saffire Pro 24.

Using the DPC Latency checker, I found a pad in Diva which cause the CPU spikes in my DAW (Sonar) but the latency wasn't affected, staying around or below 60 us the whole time.
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UltimateOutsider
KVRist
 
307 posts since 4 Oct, 2009, from Portland, OR

Postby UltimateOutsider; Tue May 13, 2014 11:30 am Re: CPU spikes with some soft synths

fluffy_little_something wrote:Xeon, aren't those server cpu's? Are they ideal for that kind of application? Just wondering...

Xeons work fine for DAW use, they're just overkill for the average user. Some pro DAW builders offer Xeon options for folks who need tons of simultaneous I/O or live multi-track processing.

Ambient Indigo wrote:turning the Multicore ON made a big difference - no spikes so far with that ON.

Yep, I was gonna recommend that, but I see you already found it. I can't use Diva very well without that enabled.
metamorphosis
KVRAF
 
3421 posts since 7 Jan, 2005, from Hamilton, New Zealand

Postby metamorphosis; Tue May 13, 2014 1:20 pm Re: CPU spikes with some soft synths

fluffy_little_something wrote:What's an Intel Xenon? 8)
In case you mean Xeon, aren't those server cpu's? Are they ideal for that kind of application? Just wondering...


No, he means the Xenu, the Scientologist-developed CPU...
XP/Vista/Win7/Win8 Optimisation, DAW Tips, AudioXP - XPFree
I made an oddly-acoustic album and an electronica thing and an alt-metal doohicky...
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Kaboom75
KVRian
 
1312 posts since 4 Sep, 2011, from England

Postby Kaboom75; Sun May 18, 2014 2:57 am Re: CPU spikes with some soft synths

I run multiple DIVAs on an overclocked intel i7 920 from 2009. If you have crackling sound you're asio buffer is too small. Enabling multicore spreads out the workload. RAM size does nothing for u-he synths. It helps sample instruments.

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