[lldb-dev] [Bug 19575] New: lldb tests not running in parallel on OS X

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19575

            Bug ID: 19575
           Summary: lldb tests not running in parallel on OS X
           Product: lldb
           Version: unspecified
          Hardware: Macintosh
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: lldb-dev at cs.uiuc.edu
          Reporter: todd.fiala at gmail.com
    Classification: Unclassified

Created attachment 12449
  --> http://llvm.org/bugs/attachment.cgi?id=12449&action=edit
adds per-worker-thread logging of various states of test execution

The fairly recent parallel test running support for lldb tests does not appear
to be working on OS X.

With the attached extended logging patch to dosep.ty, what I'm seeing is:
* the threads are created correctly - 8 worker threads on my 2012 MBP
* the work is queued up front properly, no blocking there
* the threads appear to be blocked on the system call that executes the test
--- only one of those is running at a time, the rest are blocked on the system
call.

It looks like either the system call or something about the execution of the
test (perhaps the lldb python module) is only allowing one to run at a time.

The patch is vs. r207285 of the llvm.org lldb svn repo.

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