On Mon, Oct 22, 2012 at 6:00 PM, Pascal de Bruijn <[email protected]> wrote:
> On Sun, Oct 21, 2012 at 12:47 PM, Pascal de Bruijn <[email protected]>
> wrote:
>> Hi,
>>
>> I've recently got a (second-hand) netbook, it's an Asus 1215P, which
>> has a 12" display (1366x768) and a dual core Atom CPU 1.5ghz.
>>
>> Because it's not a 10" model (1024x600) Darktable is quite usable on
>> it, except that it's not superfast, but still bearable to an extent.
>>
>> However, I've noticed the demosaicing option is rather important:
>>
>> "demosaicing for zoomed out darkroom mode"
>>
>> always bilinear ~ 5 seconds to load
>> at most ppg ~ 10 seconds to load
>>
>> So this has a rather big impact on this little CPU that couldn't :)
>>
>> That said, I think our new default (at most ppg) is fine for modern
>> proper computers. Still it would be rather cool if we could do some
>> simply CPU type detection, where (at first start) we look for what CPU
>> is present in the system, and if it is an Atom CPU we default to
>> always bilinear instead:
>
> And cutting through the noise...
>
> I think I'll be looking into this:
> http://savannah.nongnu.org/projects/proccpuinfo
Ok, so that might be a bit much...
I've just cobbled together a
not-so-portable-but-should-fail-gracefully test routine.
gcc main.c
./a.out Intel
./a.out AMD
(for example)
When it's run on a platform that doesn't have /proc/cpuinfo it simply
fails to detect said string, which isn't a problem for this use-case
as it doesn't entail a major failure. It just means a default
performance optimization will be missing (which we don't have now
anyways).
That said, are there any big concerns I might be missing? The source
might need some prettification...
Should this go into src/common/utility.c?
And where should I hook in the detection routine? As we only want to
check this when Darktable's database is initially generated (so only
for new installs)...
Regards,
Pascal de Bruijn
#include <stdio.h>
#include <string.h>
int check_cpu (const char *match)
{
int count;
char line[256];
FILE *f;
count = 0;
// only proceed of cpuinfo exists, but don't fail otherwise
if (f = fopen("/proc/cpuinfo", "r"))
{
// read the entire file
while (!feof(f))
{
// read a line
fgets(line, sizeof(line), f);
// only check model name lines
if (!strncmp(line, "model name", 10))
{
// see if the specified string is present
if (strstr(line, match) != NULL)
{
// increase the occurence counter
count++;
}
}
}
}
return count;
}
int main (int argc, char** argv)
{
printf("atomdetect\n");
printf("count %i \n", check_cpu(argv[1]));
return 0;
}
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