Re: [OM] RawTherapee

[Chuck Norcutt]

The implication is that all 5 files are being processed simultaneously 
and also competing for CPU resources.  The competition adds overhead and 
consumes memory that can't actually be productively used.  An input 
thread, an output thread and a number of processing threads equal to the 
lesser of the number of images to be processed or the number of CPUs 
would probably maximize throughput.

The avoidance of virtual memory thrashing is the subject of my one and 
only patent.  It was a long time ago.
<http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=5386561.PN.&OS=PN/5386561&RS=PN/5386561>

Chuck Norcutt


Wayne Harridge wrote:
> 
> 
> 
>> Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx> wrote:
>>
>> Sounds like they need a smarter programmer.  Apart from the I/O 
>> operations to read and store the converted file having more threads than 
>>
>> processors for CPU intensive tasks is counterproductive.  It's probably 
>> driving the virtual memory manager batty and spending all its time task 
>> switching or waiting on the swap file or both.
>>
> 
> My basis for saying that it uses multiple threads is that if I add 5 files to 
> the "queue" they all seem to stay there for most of the processing time then 
> the number of files drops to zero very quickly at the end of the process.  
> CPU utilisation sits at 100% except for the times when it's thrashing the 
> disk.  I thought there might be a parameter I could change to adjust the 
> number of threads it uses but wasn't able to find it (didn't really want to 
> poke around in the registry).  I guess I should email the developer(s) about 
> it.
> 
> ...Wayne
> 
> Wayne Harridge
> 
> http://lrh.structuregraphs.com
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