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*SOLVED* vzctl create extremly slow [message #3778]

Thu, 15 June 2006 14:08

disaster
Messages: 158
Registered: February 2006

Senior Member

Hello!

If i start vzctl create it is extremely slow because tar and gzip for decompressing the image do not use the cpu power. They mostly uses only about 0.03%-10% CPU...

tar.gz Image: 140MB
Decompressing with vzctl takes about: 4minutes

Stefan

[Updated on: Tue, 27 June 2006 10:16] by Moderator

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Re: vzctl create extremly slow [message #3794 is a reply to message #3778]

Fri, 16 June 2006 13:46

Vasily Tarasov
Messages: 1345
Registered: January 2006

Senior Member

And what about (tar+gz) without vzctl? Does it work rapid?...
Hmmm... I actually don't think the reason is in tar.
Can you, please, strace vzctl:

strace -tt -T -ff -o str.out vzctl create 200

Thanks...

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Re: vzctl create extremly slow [message #3795 is a reply to message #3778]

Fri, 16 June 2006 17:41

disaster
Messages: 158
Registered: February 2006

Senior Member

mhm tody tar xfz needs 7 seconds and vzctl create needs 28 seconds - i think this difference is normal isn't it?

I don't know thy it takes 4min yesterday...

Stefan

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Re: vzctl create extremly slow [message #3809 is a reply to message #3778]

Mon, 19 June 2006 13:56

RapidVPS
Messages: 32
Registered: January 2006

Member

From my experience "vzctl create .." is limited by the disk i/o speed. What is your disk configuration? such as disk type, speed, raid config, etc.

The difference between using one 7200rpm IDE for /vz and several 10k SCSI Raid-10 is enormous.

Paste us the output of:
iostat -k 5

(let it run for a minute in a seperate shell while vzctl create is running)

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Re: vzctl create extremly slow [message #3918 is a reply to message #3795]

Fri, 23 June 2006 19:16

dev
Messages: 1693
Registered: September 2005
Location: Moscow

Senior Member

this difference was due to some very non-optimal code in disk quota. it was optimized in recent released kernel and vzctl create
should be much closer to tar now.

http://static.openvz.org/userbars/openvz-developer.png

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