On 11/10/2015 08:55 PM, Alan McKinnon wrote: > On 10/11/2015 20:37, Stanislav Nikolov wrote: >> >> On 11/10/2015 08:17 PM, Mick wrote: >>> On Tuesday 10 Nov 2015 17:47:08 Stanislav Nikolov wrote: >>>> Dear Gentoo users, >>>> I'm building a new PC. I have a budget of ~$550-$650. No GPU, no special >>>> case (I may use a card box), not even a hdd or ssd. So, as you can see, >>>> it's pretty much "get the best CPU and mobo/ram that are compatible with >>>> it". The problem is, which is the best one. By "best" I mean to compile >>>> shit fast. My laptop with 3rd gen i5 compiles firefox for 40 minutes on >>>> average. >>>> >>>> The most expensive Intel CPU is the skylake i7-6700k. But is it the best? >>>> Is there something from AMD that will perform even better? I can't find >>>> any benchmarks with AMD/Intel CPUs. And how much does the mobo matter? >>>> Will a cheap $30 400W PSU power that thing? >>>> >>>> Thanks >>> I don't (yet) own a i7-6700k, but my 6 year old laptop with (1st >>> generation) >>> i7 Q720 @1.60GHz takes slightly less than yours: >>> >>> Sat Oct 3 14:35:40 2015 >>> www-client/firefox-38.3.0 >>> merge time: 36 minutes and 53 seconds. >>> >>> Fri Nov 6 09:10:06 2015 >>> www-client/firefox-38.4.0 >>> merge time: 38 minutes and 8 seconds. >>> >>> >>> In contrast a year old AMD A10-7850K APU is significantly faster: >>> >>> Sat Oct 3 19:40:48 2015 >>> www-client/firefox-38.3.0 >>> merge time: 17 minutes and 42 seconds. >>> >>> Fri Nov 6 08:41:02 2015 >>> www-client/firefox-38.4.0 >>> merge time: 18 minutes and 18 seconds. >>> >>> >>> I would also be interested to see compile times of more modern i7s and FXs, >>> but bear in mind that in single core operations Intel is these days >>> significantly better than AMD. >>> >> So, I shouldn't prepare for a 8x times faster compile time... :( >> > > > I can't help but think you are approaching this from the wrong perspective. > > Why exactly are you using compile times as your sole criterion? Are you > building a compile farm for Ubuntu? Running continuous integration tests > for LibreOffice [on a $600 budget in a cardboard box :-) ]? > > Or do you want emerge world to get it over with quicker? > > If the latter, you better rethink your priorities. In computing terms, > compilation is a rare event; launching apps is a common event; and > writing to the disk happens all the time. Optimize for the common case. > > A CPU never works in isolation, it is always part of a much larger > system, like disks, RAM and all possible kinds of I/O. The best CPU on > the market plugged into a POS motherboard will perform on emerge world > like a piece of shit - it will follow the weakest link. > > If you want to build a compiling machine, buy the best collection of > stuff that works together well and still fits the budget. If you want a > machine that you can use and be happy with, ignoree the temptation to > must have the biggest baddest fastest CU (you will never get to use all > that big bad fast) and invest rather in gobs of RAM and an SSD. Remember > that apps are launched many times more than they are compiled. Or put > another way, sacrifice compilation times t get something you can use.
8GB of RAM are waaay more than I use daily (several firefox tabs, nvim = 2Gb max), I have a pretty fast SSD too. Even buying 8GB RAM and a brand new SSD, I have > $450 left. Can I buy a AMD CPU that will get the job done faster than 6700k and/or cheaper?
