Aditia A. Pratama aditiapratama

Rendering in Blender on a machine with multiple GPUs

So here's the premise: For scenes that take around a minute or less to render, performance is actually worse if you render on all of the cards with a single instance of Blender. This is because (AFAIK) there's a bit of additional time necessary to collect the render results from each card and stitch them together. That time is a fixed short duration, so it's negligible on larger/longer render jobs. However, on shorter render jobs, the 'stitch time' has a much more significant impact.

I ran into this with a machine I render on that has 4 Quadro K6000s in it. To render animations, I ended up writing a few little scripts to facilitate launching 4 separate instances of Blender, each one tied to one GPU. Overall rendertime was much shorter with that setup than one instance of Blender using all 4 GPUs.

The setup works basically like this... I have a the following Python script (it can be anywhere on your hard drive, so long as you remember the path to it).

	#!/bin/bash

	# This script cleans all cache for Microsoft Teams on Linux
	# Tested on Ubuntu-like and Debian by @necrifede. Feel free to test/use in other distributions.
	# Tested with Teams via snap package.
	#
	# How to use in terminal:
	# ./clear_cache_MS_Teams.sh ( deb-stable \| deb-insider \| snap )
	# or
	# bash clear_cache_MS_Teams.sh ( deb-stable \| deb-insider \| snap )

	// Must install ImageMagick first
	http://www.imagemagick.org/script/index.php

	//This compresses a jpg with no visible loss of quality. Add in your own file names for target.jpg and result.jpg
	convert -strip -interlace Plane -sampling-factor 4:2:0 -quality 85% target.jpg result.jpg

	// This does the same as above but to an entire folder (will overwrite original files):
	mogrify -strip -interlace Plane -sampling-factor 4:2:0 -quality 85% *.jpg

	//This does the same thing but to all subfolders as well (Be careful with this one it will overwrite all original files)

	# Create new remote branch
	git push origin origin:refs/heads/new_branch_name

	# Make sure everything is updated
	git fetch origin

	# Check your branch has been created
	git branch -r

	# Track a remote branch

	#!/bin/sh
	echo "Pass 1: Analyzing file"
	ffmpeg -i "$1" -vf vidstabdetect=result="$1.trf" -f null - &> /dev/null
	echo "Pass 2: Applying transformations"
	ffmpeg -i "$1" -vf vidstabtransform=input="$1.trf" "stab_$1" &> /dev/null
	rm "$1.trf"
	echo "Done."

	#!/bin/bash

	# Source: http://toomuchdata.com/2012/06/25/how-to-install-python-2-7-3-on-centos-6-2/

	# Install stuff #
	#################

	# Install development tools and some misc. necessary packages
	yum -y groupinstall "Development tools"
	yum -y install zlib-devel # gen'l reqs

	# Author: Adhi Hargo (cadmus.sw@gmail.com)
	# License: GPL v2

	import bpy

	class CameraAddTitleSafe(bpy.types.Operator):
	bl_idname = 'object.camera_add_title_safe'
	bl_label = 'Add Camera Title Safe'
	bl_options = {'REGISTER', 'UNDO'}