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Re: poor performance inside a VE [message #10982 is a reply to message #10965]

Sun, 11 March 2007 08:05

dev
Messages: 1693
Registered: September 2005
Location: Moscow

Senior Member

- what kernel do you run?
- is it binary one from openvz.org or compiled by yourself? (please provide .config then)
- cat /proc/cpuinfo from host please
- can you also provide output of top (then press '1') during the renderer working in VE

Thanks,
Kirill

Ian P. Christian wrote:
> Hi all,
>
> A friend recently wanted to do some rendering, so I setup him up a VPS
> quickly on an idle machine for him to render on.... however - it didn't
> go so well.
>
> Here's the output of dstat with the rendering goign on in VE0 (the host).
>
>
> ----total-cpu-usage---- -disk/total -net/total- ---paging-- ---system--
> usr sys idl wai hiq siq|_read write|_recv _send|__in_ _out_|_int_ _csw_
> 17 1 82 0 0 0| 22k 637k| 0 0 | 0 0 | 236 948
> 54 0 46 0 0 0| 0 0 |2773B 4860B| 0 0 | 126 818
> 61 3 36 0 0 0| 0 16k| 596B 360B| 0 0 | 141 759
> 77 1 22 0 0 0| 0 0 |2835B 4840B| 0 0 | 118 707
> 81 1 18 0 0 0| 0 80k| 0 0 | 0 0 | 124 747
>
>
> As you can see, it's using most of the CPU (there's 2 hyperthreading
> xeons in this machine), and all is well. The render completes in about
> 30 minutes.
>
>
> However... here's what happens when I run ths render inside a VE
> ----total-cpu-usage---- -disk/total -net/total- ---paging-- ---system--
> usr sys idl wai hiq siq|_read write|_recv _send|__in_ _out_|_int_ _csw_
> 18 1 81 0 0 0| 22k 626k| 0 0 | 0 0 | 234 971
> 2 0 98 0 0 0| 0 0 |2675B 4500B| 0 0 | 120 11k
> 0 0 99 0 0 0| 0 16k| 0 0 | 0 0 | 126 12k
> 2 0 98 0 0 0| 0 0 |1999B 3730B| 0 0 | 121 9010
> 1 0 99 0 0 0| 0 16k| 0 0 | 0 0 | 125 11k
> 1 0 99 0 0 0| 0 0 |1935B 3730B| 0 0 | 116 10k
>
>
> Notice the stupidly high number of context switches (last column). The
> render on the VE is estimated to take about 10 times longer...
>
> # in=spaceinvader.flam3 format=png transparency=false prefix="renderc"
> verbose=1 flam3-render
> Automatically detected 4 core(s)...
> chaos: 0.5% ETA: 286.5 minutes
>
>
> Can anyone suggest why this is?
>
>

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[Message index]

		poor performance inside a VE By: pookey on Sat, 10 March 2007 10:16
		Re: poor performance inside a VE By: Sidnei Rodrigo Basei on Sat, 10 March 2007 20:14
		Re: poor performance inside a VE By: pookey on Sat, 10 March 2007 20:50
		Re: poor performance inside a VE By: dev on Sun, 11 March 2007 08:05
		Re: poor performance inside a VE By: pookey on Sun, 11 March 2007 08:32
		Re: poor performance inside a VE By: pookey on Sun, 11 March 2007 12:29

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