Is this test summary good or bad?

Simon Marlow simonmarhaskell at
Wed Jul 12 04:55:06 EDT 2006

Joel Reymont wrote:
> On Jul 11, 2006, at 11:00 AM, Simon Marlow wrote:
>> Which ones hang?  Could you take one of the hanging tests, compile  it 
>> with -debug, run with +RTS -Ds, and send us the output?
> What ends up happening is this:
> 28683  p2  S      0:00.11 ../../timeout/timeout 300 cd ./typecheck/ 
> should_compile && '/Users/joelr/work/Haskell/ghc/compiler/stage2/ghc- 
> inplace' -no-recomp -dcore-lint -dcmm-lint -Di386_apple_darwin -c  
> tc033.hs   -fno-warn-incomplete-patterns >tc033.comp.stderr 2>&1
> 29125  p2  R      1:53.48 ../../timeout/timeout 300 cd ./typecheck/ 
> should_fail && '/Users/joelr/work/Haskell/ghc/compiler/stage2/ghc- 
> inplace' -no-recomp -dcore-lint -dcmm-lint -Di386_apple_darwin -c  
> tcfail011.hs    >tcfail011.comp.stderr 2>&1
> Now, these things have been running there forever and I'm not even  sure 
> it's a Haskell problem. I suppose the test harness should have  
> terminated the test after 300 seconds but didn't.
> If I try to re-run the first process by hand it finishes instantly.  If 
> I try to re-run the whole thing as above, putting everything after  300 
> in double quotes it also finishes instantly.

The timeout program is a bit of a bugbear.  It uses forkProcess in a non-trivial 
way, and has caused me many problems (forkProcess in the threaded RTS is a bit 
difficult to get right, as you might imagine).  So I suspect some kind of bug 
around forkProcess on MacOS X.

If you could capture the +RTS -Ds output from a timeout that hangs, that would 
help.  You probably need to run something like 'timeout 1 true +RTS -Ds 2>&1 
 >log' in a loop until it hangs.


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