mgorny added a comment.

In D116255#3213612 <https://reviews.llvm.org/D116255#3213612>, @labath wrote:

> That would deal with the code coverage, but it still leaves us with a fairly 
> large core file, and a lot of uninteresting tests obscuring the output.
>
> How do you generate these core files? Do you actually create a fresh core 
> dump or you just recompute the "interesting" portions from a master file you 
> have around? If you make the changes the the master core file, then they 
> would get automatically picked up during the recomputation.

I do recompute them from master copies (which I finally need to upload 
somewhere) but the recomputation is really dumb and unaware of the file format. 
I suppose I could just hack LLDB to stop after grabbing the first N threads 
but… the first non-dump on-CPU thread is no. 200. Finishing on that will 
probably make the core smaller but not sure how much smaller. I'll try in a 
minute.

> Alternatively, maybe there is a way to capture a core file without so many 
> processes. Either killing off everything before the core file is written, or 
> by making sure the other processes are never started (something like 
> `init=/bin/bash` on linux)?

The vast majority of threads are kernel threads. At a quick glance, only about 
20 threads look like userspace.


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https://reviews.llvm.org/D116255

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