Scott C. Frase wrote:
> On Thu, 2007-12-27 at 11:45 -0600, Timothy Baldridge wrote:
>> Your disk performance may be holding you back as well. On the oil
>> effect, you are CPU bound, on a faster effect (e.g. grayscale) you
>> will be primarily IO bound. Here's an example. Only recently (in the
>> past 3 years) has Discreet moved to x86. Before that they were selling
>> their highest end product (for editing 4K film) on a quad CPU 1Ghz.
>> But they smoked the competition when it came to performance. Why? Most
>> of the time these systems had a 10-30 fibre channel RAID behind them.
>> This allowed the Tezro and Onyx3 systems to edit 5 streams of
>> real-time 4k video on a system that had basically no number crunching
>> power. 9 times out of 10 you will be limited by your disk performance,
>> not the CPU.
>>
>> I would suggest running a bonnie++ benchmark on your disks, from there
>> you can calculate an approximate max fps processing rate for the
>> disks.
>>
>> Timothy
> Hi Timothy,
> Thanks for the thought. I have been monitoring wait i/o via mpstat and
> it doesn't seem to be the issue. Here's recent output of mpstat using a
> bunch of effects on a HDV video render, including oil painting. The
> sixth column is iowait:
>
> 01:15:45 PM CPU %user %nice %sys %iowait %irq %soft %steal
> %idle intr/s
> 01:15:55 PM 0 87.30 0.00 0.60 0.00 0.00 0.30 0.00
> 11.80 150.20
> 01:15:55 PM 1 87.40 0.00 0.70 0.00 0.00 0.00 0.00
> 11.90 127.90
> 01:15:55 PM 2 86.70 0.00 0.40 0.20 0.00 0.30 0.00
> 12.40 150.20
> 01:15:55 PM 3 87.71 0.00 0.30 0.00 0.00 0.00 0.00
> 11.99 128.00
> 01:15:55 PM 4 87.40 0.00 0.40 0.00 0.00 0.00 0.00
> 12.20 134.30
> 01:15:55 PM 5 87.10 0.00 0.60 0.00 0.00 0.00 0.00
> 12.30 128.00
> 01:15:55 PM 6 86.70 0.00 0.10 0.00 0.00 0.00 0.00
> 13.20 134.10
> 01:15:55 PM 7 86.80 0.00 0.20 0.00 0.00 0.00 0.00
> 13.00 128.50
>
>
> Notice that iowait is zero. I do have a couple of RAID 0 filesystems,
> one based on software RAID and the other hardware.
>
> scott
Cinelerra has some race problems between threads which let them wait on
each other doing nothing, this is hard to fix unfortunally. But
generally I think adding more CPU's will add some performance
improvement. While in doubt, you may better opt for more ram (4 or more
GB of ram). For long time future I we will fix this (with what is called
cinelerra 3 now) to have no races and utilize multi cpu systems much
bettter, but don't hold your breath yet for that.
Christian
>
>
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