On 23.11.2015 22:38, Willy Tarreau wrote: > Hi Andrew, > > On Mon, Nov 23, 2015 at 12:19:22PM -0600, Andrew Hayworth wrote: >> That said, the difference between one and two map lookups is >> negligible, so I don't think you're saving much this way and it'll >> make configuration harder in some ways if you keep adding IPs. I can >> vouch from personal experience in production that we run 2+ map >> lookups on every request at Braintree (hundreds of req/s) and it adds >> no noticeable latency. Food for thought. :) > > I agree, depending on the map size, you'll see something between 1 and 10 > million lookups per second, it's quite cheap. I do abuse them as well and > I don't bother about the number of lookups. Sure if I have to match a > country among a few tens, I'll certainly use a variable first, but otherwise > I don't care.
I'm going to use multiple lookups until I can upgrade to 1.6 because I agree that it's not going to cause any major issues in our current setup. It's just that when I'm looking the same value up multiple times in a map of about 800.000 values my coding sensibilities immediately go for storing the result in a variable instead. Regards, Dennis
