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February 2019

5 participants
2 discussions

Take a task out of an Argobot pool?
by Quincey Koziol 28 Feb '19

28 Feb '19

Hi all, I need to pull a task out of an Argobot pool and execute it “now”, in the current thread. Any suggestions for the best way to do that? I am thinking about calling ABT_task_cancel() to get it out of the pool, then just call the task_func (that we gave to ABT_task_create) directly from the place we took it out of the pool. Will that work? Is there a better way? Thanks, Quincey

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how to debug a stack overrun in Argobots
by Carns, Philip H. 27 Feb '19

27 Feb '19

Hi all, There is a little bit of back story on https://github.com/pmodels/argobots/issues/93 , but make a long story short we have realized that we have some code that is overflowing the stack in Argobots. Many thanks to Shintaro for his help and insight or we may have never figured this out. We can work around the problem with `export ABT_THREAD_STACKSIZE=$((1024 * 1024))`. This not only fixes a Power8 test case for us, but also appears to solve a different frustrating, nonsensical segmentation fault that we've been chasing with a different code permutation on x86_64. Any suggestions on how to track down what's triggering this in our code or get a better idea of how much stack we need? We are using a considerable number of libraries, many of which are not maintained by us, so I don't even know where to start looking yet. My usual go to tool for this would be asan in gcc or clang, but I don't think that will work correctly with Argobots, and maybe there is a better solution anyway. thanks, -Phil

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