Mystery solved -- the gap is likely the RTS waiting on an external process (the linker) to exit.
On Tue, Jul 30, 2013 at 3:34 PM, Patrick Palka <patr...@parcs.ath.cx> wrote: > Hi, > > I'm analyzing the performance of my parallel --make branch of GHC ( > https://github.com/parcs/ghc/tree/cherry-picking if anyone is interested) > by compiling the Cabal repository in parallel, using two capabilities. > > I'm seeing very strange results from Threadscope: at some point during the > compile, absolutely no work is being performed on any HEC for about 2 > seconds. How do I interpret this kind of behavior? What does it mean? > > Relevant screenshot: http://i.imgur.com/uDQk9zG.png > > Patrick >
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