On Sun, 2011-07-10 at 20:03 +0200, Toon Moene wrote: > On 07/10/2011 06:45 AM, Ian Lance Taylor wrote: > > > Toon Moene<t...@moene.org> writes: > > >> As of a couple of months, I perform a bootstrap-with-C++ > >> (--enable-build-with-cxx) daily on my machine between 18:10 and 20:10 > >> UTC. > >> > >> I see that the build by a C++ compiler has been the subject of the GCC > >> Gathering at Google: > >> > >> C++ style and migration crowl writing and using C++ in gcc > >> > >> It is not quite clear what the outcome of this discussion was. > >> > >> Is there still interest in daily builds like mine ? > > > > Yes, it's definitely useful. > > > > The immediate blocker to using C++ in gcc is the Ada frontend. > > --enable-build-with-cxx and --enable-languages=ada do not work together. > > Ah, OK. > > Just drop me a note when a regular test including Ada starts to be > useful (I probably have to skip some other front end language in favor > Ada to stay within the two hour elapsed time window between two weather > forecasting runs). > > BTW, the ultimate reason I asked was that it turned out that running an > ordinary quad core PC to the max doesn't come for free. > > Last month I got past year's electricity bill - it turns out that I am > now (16 hours of weather forecasting and 4 hours of GCC bootstrapping > per day) using 3200 KWh a year - to the tune of 1100 Euros. > > So the question whether a run is useful is certainly relevant :-)
Hi, Since I pay the electricty bill of some compile farm machines I understand you here :). New generation of hardware has made significant progress on energy efficiency: my latest built PC is a Intel core i7 2600 4 cores 8 threads 3.4 GHz 4x4 GB of RAM with 40 GB SSD + 2TB HDD, 80+ gold PSU and it idles around 30W and uses 110W full CPU load. PC cost is around 800 EUR in France (19.6% VAT included). According to your data it should reduce your bill by a factor of three (365W => 110W), so it should pay itself in around a year: 720 EUR less on your yearly electricity bill, assuming you counted only your PC power consumption in your figures. And bonus nearly no noise in a case with 2 or 3 120mm fans. I haven't had a chance to test AMD A8 processors but I will do soon. Sincerely, Laurent
