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Full Discussion: QEMU performance?
Special Forums UNIX and Linux Applications Virtualization and Cloud Computing QEMU performance? Post 302930185 by sea on Wednesday 31st of December 2014 05:12:34 AM
Old 12-31-2014
Computer QEMU performance?

Heyas

So, i like doing custom a LiveImage of my OS.
Using Redhats kickstart/livecd-creator method.

Anyway, so i would like to test the liveimages...
AND also, i WOULD like to install FreeBSD, Solaris, or whatever, onto a Virtual Machine.

I used to use Oracles Virtualbox, but eversince i'm booting with SecureBoot enabled, i'm no longer able to start it, so i had to change to QEMU.

Now, to just 'test' if the fresh generated iso is 'working' or not, QEMU is just fine.
But if i ever want to actualy do in QEMU, like, switching desktop, or changing the folder in pcmanfm inside QEMU, it needs patience out of this world...

I'm running my ISO's like this:
Code:
#!/bin/bash
# isotest
# Description:	Simply boots an iso file with qemu.
# ------------------------------------------------------
#
#	Variables
#
	DEFAULT_ARCH=x86_64
	DEFAULT_ARCH=$(uname -m)
	DEFAULT_RAM=$(( 4 * 1024 ))
	DEFAULT_CORES=4
	DEFAULT_VGA=vmware
	DEFAULT_FORMAT=qcow2
	DEFAULT_SIZE=5G
	DEFAULT_IMAGE_DIR=$HOME/Virtual_Machine_Images
	DEFAULT_IMAGE_FILE=isotest.img
#
#	Display & Action
#
	qemu-system-$DEFAULT_ARCH \
		-smp $DEFAULT_CORES \
		-m $DEFAULT_RAM \
		-cdrom "$1"

And to 'install' or run an intalled image i execute:
Code:
#!/bin/bash
# distrotest
# Description:	Simply boots an OS file with qemu.
# ------------------------------------------------------
#
#	Variables
#
	DEFAULT_ARCH=x86_64
	DEFAULT_ARCH=$(uname -m)
	DEFAULT_RAM=$(( 4 * 1024 ))
	DEFAULT_CORES=4
	DEFAULT_VGA=vmware
	DEFAULT_FORMAT=qcow2
	DEFAULT_SIZE=5G
	DEFAULT_IMAGE_DIR=$HOME/Virtual_Machine_Images
	DEFAULT_IMAGE_FILE=distrotest.img
#
#	Functions
#
	DEFAULT_IMAGE="$DEFAULT_IMAGE_DIR/$DEFAULT_IMAGE_FILE"
	[[ -f "$1" ]] || exit 1
	if [[ ! -f "$DEFAULT_IMAGE" ]]
	then	# We just need an image to boot an iso, this can be quite small.
		qemu-img create -f "$DEFAULT_FORMAT" "$DEFAULT_IMAGE" $DEFAULT_SIZE
	fi
#
#	Display & Action
#
	qemu-system-$DEFAULT_ARCH \
		-smp $DEFAULT_CORES \
		-m $DEFAULT_RAM \
		-cdrom "$1" \
		-hda "$DEFAULT_IMAGE"
# 		-full-screen \

As you see, i'm quite, sharing?, with my hardware for qemu...
4 Cores and 4 GB of ram, but booting an ISO (same for installed) takes up to ~7mins, when with O-VB it was as low as ~1min -- using 768mb ram and 70% of 1 core....

Doing a mouse click and wait for like 20 secs for ANYTHING to happen, is just annoying.

Any ideas or advices please?
Thank you in advance
 

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qemubuilder(8)							     pbuilder							    qemubuilder(8)

NAME
qemubuilder - a pbuilder wrapper for qemu. SYNOPSIS
qemubuilder [commands] [options] DESCRIPTION
qemubuilder Executes the specified pbuilder operation with qemu COMMANDS
Most commands imitate pbuilder, see pbuilder manual for details. --create Create the base.qemu image. --update Update the base.qemu image. --build .dsc-file Build a package given a .dsc file --login Start a session within the base.qemu. --execute Execute a command within the base.qemu. --dumpconfig dump configuration information. --arch-diskdevice sd/hd specify whether disk device inside the virtual machine is called /dev/sda or /dev/hda. The possible value is 'sd' or 'hd'. --smp 2 The option passed to SMP. OPTIONS
Most options are the same as pbuilder, except for the following which are handled specially. SMP 2 The SMP option for qemu. I don't think I can support bind-mounts in qemu. Documentation here should be updated according to what's defined in parameter.c, but it isn't. CONFIGURATION FILES
qemubuilder reads the following configuration files per default. /usr/share/pbuilder/pbuilderrc Application default, not to be changed. /etc/pbuilderrc System-wide default. ~/.pbuilderrc User default anything specified with --configfile option Additional configuration at runtime. CONFIGURATION FILE OPTIONS
The possible configuration options are as follows. Others are ignored. DISTRIBUTION=distribution BUILDRESULT=directory BUILDPLACE=directory BASEPATH=path MIRRORSITE=http://mirror KERNEL_IMAGE=vmlinuz Linux kernel to use. INITRD=initrd initrd to use. ARCHITECTURE=arch The target architecture. You can also use ARCH=arch for compatibility with 0.60 or older. MEMORY_MEGS=64 memory size to use in qemu session, in MB. ARCH_DISKDEVICE=hd The architecture-specific disk device specifier. Most arches use sd these days. The only exceptions were i386 and amd64, which used to use hd. EXAMPLES
qemubuilder --create Create a base.qemu image. qemubuilder --update Update the base.qemu image. qemubuilder --build test_0.1.dsc Build the package specified in dsc file, with the base.qemu image. pdebuild --pbuilder qemubuilder Run qemubuilder --build against the current directory. The current directory should be an extracted Debian source package direc- tory. Edit /etc/pbuilderrc to have PDEBUILD_PBUILDER=qemubuilder to make this the default behavior for pdebuild. qemubuilder --create --distribution sid --basepath /var/cache/pbuilder/base-test.qemu Create a base.qemu image with the path /var/cache/pbuilder/base-test.qemu and distribution sid. Example pbuilderrc for i386 KERNEL_IMAGE=vmlinuz-2.6.18-4-k7 INITRD=initrd.img-2.6.18-4-k7 ARCHITECTURE=i386 BASEPATH=/home/dancer/tmp/base-i386.qemu MEMORY_MEGS=64 Note. INITRD may or may not be required for your system. Debian Installer initrd may or may not work depending on which one you choose, use the one from an installed system. CAVEATS Note that for mirror specification, http://localhost/debian/ usually doesn't work, it will be searching for files on the virtual machine itself, not the host OS. AUTHOR
Junichi Uekawa (dancer@debian.org) SEE ALSO
/usr/share/doc/pbuilder/pbuilder-doc.html, pbuilder (8), pdebuild (1) pbuilder 2008 Aug 10 qemubuilder(8)
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