[isabelle-dev] NEWS: isabelle build -X
makarius at sketis.net
Fri Apr 17 14:23:13 CEST 2015
* The Isabelle tool "build" provides new options -X, -k, -x.
This refers to Isabelle/e0d1d9203275. At the risk of using up all the
alphabet for options eventually, there is now the possibility to exlude
session groups systematically.
This is particularly relevant for AFP/662e7aa68008, to save some hours of
isabelle build -d '$AFP' -a -X slow
Here are the results for the slow group alone on my modest home machine
(12 cores Xeon using -j4 and 6 ML threads):
Finished JinjaThreads (0:38:02 elapsed time, 3:00:37 cpu time, factor 4.74)
Finished ConcurrentGC (0:49:40 elapsed time, 2:26:41 cpu time, factor 2.95)
Finished AODV (1:41:31 elapsed time, 8:46:49 cpu time, factor 5.18)
About 10 years ago, tiny sessions like MicroJava required 45min elapsed
time. We are a bit better than that today, but there is also a tendency
of many people sticking to old hardware, and expecting that things are
still fast. Moore's Law means that hardware is continously updated by
cheaper and faster machines.
More information about the isabelle-dev