#10159: cabal build/ghc compiler causes sudden hard reboot of my computer! ---------------------------------+----------------------------------------- Reporter: jamshid | Owner: Type: bug | Status: infoneeded Priority: normal | Milestone: Component: Compiler | Version: 7.8.4 Resolution: | Keywords: Operating System: Linux | Architecture: x86_64 (amd64) Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: ---------------------------------+----------------------------------------- Comment (by jamshid): OK, I've learned more, and have a better idea of what is going on. So, I started monitoring CPU usage during builds, and noticed that when I type in "cabal build", the CPU would go to about 400%, whereas when I type in "cabal install", it tops out at about 99%.... For some reason "cabal install" only uses one core of my CPU, "cabal build" tried to use more. I was able to fix this problem by adding a "ghc-options: -j8" in my cabal file (well, the full line was "ghc-options: -Wall -O2 -j8". As soon as I did this, "cabal install" started crashing my machine also. So, now I am more convinced that I have faulty hardware.... A CPU that overheats when I use multiple cores. There still are some open questions though. First, why doesn't anything else trigger this, even when I rev up all my cores with processes running an empty loop.... and second, why does "cabal install" use 1 core, while "cabal build" uses many (by default). BTW- I did film the build with -v3, but the last comments were pretty nondescript, a bunch of *** CPSZ: *** CPSZ: *** CPSZ: *** CPSZ: *** CPSZ: *** CPSZ: *** CPSZ: I have the full video if you want it, although at this point it seems less important. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10159#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler