[cfe-dev] Parallelizing clang tests

Sam Bishop sam at bishop.dhs.org
Fri Mar 14 21:21:54 PDT 2008

I know this is a little off-topic, but would anyone be opposed to a 
"valgrind mode" for "make test"?  ("make test VG=1", probably.)

If so, is there a valgrind-like tool for the Mac?  It looks like a 
Darwin/x86 port is high priority for the valgrind developers, but 
currently not available.

I would be happy to add support for this, if you all think it is a 
good idea.  Or Gabor is welcome to.


Chris Lattner wrote:
> On Mar 1, 2008, at 10:54 AM, Gabor Greif wrote:
>>I have access to a quad Mac Pro now and have started building clang
>>in the llvm tree.
>>I know that clang's test system is independent of dejagnu (which is a
>>good thing).
>>While TestRunner.sh is pretty basic it does a good job.
>>But I expect that the clang tests will multiply soon. So I thought of
>>using extra cores to speed up tests.
>>The idea is this:
> This is really cool Gabor.  I'd really like to see this.   One  
> additional request: in terms of output, it is nice to be able to get  
> output as tests are run.  This lets you know if the test harness has  
> hung and lets you see what progress it is making.  However, most tests  
> are successful, so seriously verbose output is bad (and potentially  
> confusing when -j is used).
> How about this approach:
> 1. by default, a successful test, immediately after it is run, prints  
> out a single "." with no newline.
> 2. by default, a failing test prints out "\n---- foo.c failed ---\n"  
> or whatever.
> 3. When VERBOSE=1 is passed to make, it could print all the tests it  
> is running like it does today: print the test name before it is  
> executed, which is useful if the test hangs.
> This means that we'll get a nice "progress bar" out of dots in the  
> common case when everything is passing, but that the order of the dots  
> won't matter, and if individual dots get intermixed because of -j, it  
> won't matter.
> What do you think?
> -Chris
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