Re: make 3.81 + i386-pc-interix* parallelism problem, and "write error"

[Markus Duft]

On Tue, 2009-03-24 at 07:06 +0100, Markus Duft wrote:
> On Tue, 2009-03-17 at 17:56 +0100, Markus Duft wrote:
> > Hi!
> 
> ping...

ping ping.... at least a comment on this would be cool... don't leave me
in the dark! i think my report is quite detailed, and not one of the
"make is broken - fix it" ...

> 
> > 
> > I'm running make on x86 interix (SFU/SUA). All works like a charm, except
> > for occasional problems with multi-core machines (I'm not sure if the same
> > problems would occur on single cores too...).
> > 
> > I'm seeing two different problems, the "bader" one being a jobserver token
> > leak. Sometimes make exits with messages like this:
> > 
> >     make: INTERNAL: Exiting with 3 jobserver tokens available; should be
> > 2!
> > 
> > But much worse is the case where make simply hangs, and seems to be out of
> > jobserver tokens! Is this a known problem? I tried the patch from [1], but
> > that didn't make any difference.
> > 
> > Also I found a patch against 3.80, adding the jobserver_tokens global
> > variable, so I assume that one has been incorporated into 3.81, since this
> > variable already exists... (?).
> > 
> > I attached the output of this command and the corresponding .diff file:
> >     while ( cd tests && perl ./run_make_tests.pl features/parallelism
> > -make ../make -debug -verbose ); do echo ...; done > xx 2>&1 &
> > 
> > the test-1 log is seemingly another problem, which occurred while I tried to
> > faster provocate the error I'm reporting here by putting my 2 core AMD CPU
> > under heavy load. Ugh... another one :(
> > 
> > FYI I attached the config.log too, so you can identify potential issues
> > caused by assumptions which may be wrong for interix.
> > 
> > [1] http://savannah.gnu.org/bugs/?18124
> > 
> > ----
> > 
> > Now for the second problem, which is far easier to work around: Again only
> > occasionally I'm getting "make[N]: write error". After
> > R[eading]T[he]F[ine]S[source] I found out that ferror(stdout) triggers this
> > message. Strange... seems like there was an error writing to stdout..? or
> > could this point to an error writing to the jobserver fds?
> > 
> > I worked around the problem for now by simply not exiting on this error,
> > since it's not too critical for me if a line in the output is missing or
> > something like that. Also since it's only occasionally, I can simple do make
> > again, If I really need all the output.
> > 
> > BTW I never noticed missing output when I got "write error", but output
> > tends to be kilometers long, so I could have overseen that :)
> > 
> > Any ideas regarding those two?
> > 
> > P.S.: I just noticed that the --enable-case-insensitive-file-system (interix
> > is insensitive, as it uses window's fs') is win32 only as-is, since it uses
> > strcmpi. Attached is a patch fixing this for interix. Maybe this fixes for
> > this feature for mac osx too (is there support for max osx yet?).
> > 
> > Thanks in advance, Cheers,
> > Markus Duft
> > 
> > _______________________________________________
> > Bug-make mailing list
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> > http://lists.gnu.org/mailman/listinfo/bug-make
> 
> 
> 
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