Am Sonntag, 6. August 2017 um 01:10:02, schrieb Scott Kostyshak 
> I usually do the following for running the ctests:
>     ctest -j$( nproc )
>     ctest --rerun-failed
> This has behaved robustly for a while. However, I've recently gained access 
> to a
> server where I could run 64 jobs simultaneously, and now the above approach
> shows problems, compared to results from the following:
>     ctest -j1
> By "problems" I mean that there are more failed tests in the first.
> when I compare the user directories, located at
>     /home/scott/lyxbuilds/master/CMakeBuild/Testing/.lyx
> a key difference is in lyxrc.defaults.
> The "good" lyxrc.defaults has the following at the end:
>     \font_encoding "T1"
> The "bad" does not. When I copy that line over, the test now succeeds.
> When looking at the differences in configure.log, between the "bad" and the
> "good" versions, the following difference appears:
>     > DEBUG: Add to RC:
>     > \font_encoding "T1"
> The relevant part of that handles this is:
>     # currently, values in chkconfig are only used to set
>     # \font_encoding
>     values = {}
>     for line in open('chkconfig.vars').readlines():
>         key, val = re.sub('-', '_', line).split('=')
>         val = val.strip()
>         values[key] = val.strip("'")
>     # chk_fontenc may not exist
>     try:
>         addToRC(r'\font_encoding "%s"' % values["chk_fontenc"])
> So the problem might be that chkconfig.vars does not exist at this point in 
> the
> code. removes chkconfig.vars when it is done with it. Thus, the
> problem appears to be that there are two scripts running at the
> same time. When the second one is running and creates chkconfig.vars, the 
> first
> one deletes it, and the second one thus does not read it. I cannot be sure 
> that
> is what's happening, but I can confirm that when I run 
>     ctest -j$( nproc )
> was run twice. The way I confirmed this was to add the following
> code inside of, which creates a file with the PID in the 
> filename:
>     file = open("/home/scott/Desktop/skconfigure" + str(os.getpid()),"w")
>     file.write("Hello World")
>     file.close()
> and two files show up.
> Note that I cannot reproduce the above on a computer with 8 cores, no matter 
> how
> high I set the number of jobs. So to reproduce, one would need at least 20 
> cores
> from my testing. Further, I cannot reproduce every time, which is not
> surprising.
> In summary, I have two questions:
> 1. Do we know why ctest -j$LARGE_NUMBER results in two calls to
> 2. Although this problem only came up with a strange use case, do we want to
>    make more robust to such situations? The answer might be "no"
>    because I can't think of a common use case. One fix for this particular
>    issue would be to read and write files with filenames such as
>    chkconfig.vars_$PID, where $PID is the PID of the process. I believe this
>    would fix the particular issue that I'm seeing (but I haven't checked).
>    Another fix would be to just not remove those temporary files.
> Any thoughts?
> Scott

This should not happen. The check for the need of reconfiguration is done at 
        bool LyX::queryUserLyXDir(bool explicit_userdir)
which is called at LyX.cpp:921.
This call is guarded with fileLock(lock_file.c_str());
And the reconfiguration is done in the same guard.
                string const lock_file = package().getConfigureLockName();
                int fd = fileLock(lock_file.c_str());

                if (queryUserLyXDir(package().explicit_user_support())) {
                        // Now the user directory is present on first start.
                fileUnlock(fd, lock_file.c_str());


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