clearing local caches

[Dmitry Rybin]

Hello.

powerdns-recursor - the best. :)) Over 20k req/sec - feel good.

As variant try to use small TTL like:
bind:
max-ncache-ttl 1;
max-cache-ttl 1;

powerdns-recursor
cache-ttl=1
default-ttl=1


Scott Haneda wrote:
> Hello, this may not entirely be related to BIND/named, though I believe 
> it is.
> 
> I am working on a set of benchmarks to test the resolving speed of 
> different recursive DNS providers.  My plan is call an http resource, 
> and see how long it takes to resolve that host, as well as all embedded 
> hosts and redirects within the html.
> 
> After the initial test, I will want to call the same resource, with a 
> different resolver.  What is the most reliable way to clear any caches I 
> would have picked up from the first request?  I suspect I should call it 
> 2x, so the remote resolver can cache the request, and provide those 
> results as well?
> 
> Currently, I was planing on using a browser, and timing the page request 
> from start to stop with javascript.  I am not entirely in love with this 
> idea for obvious reasons.
> 
> Can anyone suggest a better method?  I could grep out the url's from an 
> ad heavy url, and curl each of those, making a cumulative time result.  
> However, I would like to just get DNS response times.
> 
> Perhaps take the list of hosts and feed them to a iterative script 
> calling dig, and fish out the response time?  This does add the problem 
> of redirects of course would not be followed, so I would have to 
> pre-fetch all my urls and follow them to get my testing list.
> 
> Thanks for any suggestions.