Based upon my understanding I don't think this is expected behavior. Can you 
share a minimal proof of concept which shows this happening?

-- WXS

> On May 17, 2017, at 8:18 AM, tofbaas...@gmail.com wrote:
> 
> Hello again , 
> 
> I'm using yara python to match rules against a lot of files . The problem is 
> when the number of files gets big the performance is really horrible . 
> 
> When doing some profiling I noticed that when running 12319 files against 
> about a 1000 to 1500 rules the yara callback function gets called 151991822 
> times ?
> Does the callback function get called for each matching string of a rule ? 
> In my test I only had 28 matches so it's not that I'm doing any heavy lifting 
> if there's a match
> Is there anything I can do about this , or is this behaviour to be expected 
> with this number of files ? I haven't compared against native yara yet ...
> 
> Thank you
> 
> 
>  
> 
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