Re: [Nuke-users] nuke render memory management

[Magno Borgo]

Try rendering on terminal with -c flag

"-c 2048M" for example will limit memory usage to 2GB

I'm running out of memory on the farm on one of my comps. 

I don't remember running into this kind of thing with a comp of this size on nuke 6.3x and I'm wondering if I have missed something. 

I've precomped all the branches that I can. 

I've also turned off all postage stamps. 

I've also tried turning down the cache memory usage to 10%, along with turning all memory settings to very low.

Renders consistently run out of ram on the farm. The farm nodes have 16GB RAM. 

On my comp station, this comp eats 22GB of RAM, until I clear the buffers.

It's a somewhat large comp. 781 nodes. 762 channels. About 75 read nodes (reads are CG passes)

HD inputs are between 2MB/frame and 8MB/frame

Rendering zip1 16 half EXR

Environment:

Windows 7

Nuke 7.0v6

same config on farm, except 16GB RAM

Looking at my buffer report, I'm noticing a large amount of ChannleMerge nodes reporting memory usage of 300-400MB each. For example:

ChannelMerge

total usage: 339MB

user data:

cacheRegion 1920x1080

channels 

[... lots of channels listed here ...]

usage 100%

lossage 19

weight 0x0

another example:

ShuffleCopy

total usage: 247MB

user data:

cacheRegion 1928x1088

channels extraTex_vrayUserColor_restaurant01.g,nigel.body,props.dump,lloyd.body,linus,extraTex_vrayUserColor_set03.r,reflect.red,reflect.green,reflect.blue,refract.red,refract.green,refract.blue,specular.red,specular.green,specular.blue,GI.red,GI.green,GI.blue,SSS.r,SSS.g,SSS.b,diffuse.r,diffuse.g,diffuse.b,lighting.red,lighting.green,lighting.blue,extraTex_vrayUserColor_interiors.g,extraTex_vrayUserColor_restaurant02.r,extraTex_vrayUserColor_set01.g,extraTex_vrayUserColor_set01.b,extraTex_vrayUserColor_set02.r,extraTex_vrayUserColor_set02.g,extraTex_vrayUserColor_set03.g,gush.a,normWorld.r,normWorld.g,normWorld.b,gg.body,gg.hair,bldg.green,bldg.blue,bldg.alpha,lloyd.stripe

usage 100%

weight 0x0

Is this normal?

Why are there lots of channels listed in the ChannelMerge node, when it should only be evaluating two input channels, and outputing one channel?

Why is this comp so heavy?

What am I missing here? 

Thanks for your help,

Ryan

--

Magno Borgo
Certified Nuke Trainer
www.boundaryvfx.com
www.borgo.tv
Brasil:Curitiba:GMT= -3

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