Re: CentOS Stream installation
On Sun, 2023-02-05 at 23:46 +0100, Bruno Haible wrote: > Paul Smith wrote: > > How many CPUs did you give to the VM? It shouldn't matter since > > we're doing multiprocessing here but... maybe...? I was using 4G > > RAM and 4 CPUs in my guest. > > I am using 1 CPU in that VM. For some completely unfathomable reason if I reduce my CPU count to 1 then I also see these failures on CentOS Stream 8 (haven't tried any others)!! GNU make is NOT multithreaded so I just can't figure out what could possibly cause this behavior. I tried with older versions of GNU make (e.g., 4.2.1) and see the same thing so this is not a regression. I'm going to look into it and see if I can find something.
Re: CentOS Stream installation
On Sat, 2023-02-18 at 16:55 -0500, Paul Smith wrote: > On Sun, 2023-02-05 at 23:46 +0100, Bruno Haible wrote: > > Paul Smith wrote: > > > How many CPUs did you give to the VM? It shouldn't matter since > > > we're doing multiprocessing here but... maybe...? I was using 4G > > > RAM and 4 CPUs in my guest. > > > > I am using 1 CPU in that VM. > > For some completely unfathomable reason if I reduce my CPU count to 1 > then I also see these failures on CentOS Stream 8 (haven't tried any > others)!! > > I'm going to look into it and see if I can find something. I believe I have a fix for this. It worked reliably on a 1 CPU system after 15 runs. This is actually a real issue that might reduce the amount of parallelism we could achieve, even on multi-CPU systems, so a good find.
Re: Regression on Cygwin: Problems with parallel make in 4.4
On Wed, 2023-02-15 at 19:34 +0100, Bruno Haible wrote: > > I may be misremembering but I thought that you had tried forcing > > the pipe jobserver option on GNU/Hurd and it didn't help. > > This must be a misunderstanding. I never said that. I don't even know > how to do this, within the framework of GNU make's test suite. Sorry, I thought there was a way to do it via configure but I see there was not (easily). I've made a change that causes GNU/Hurd to not use the mkfifo()-based jobserver, and go back to using pipe(). I am not sure if there is an alternative, or what to do about Cygwin. I haven't been able to create any test environments that can reproduce these issues so I don't know what the actual problem is.
Re: Regression on Cygwin: Problems with parallel make in 4.4
On Wed, 2023-02-15 at 13:57 -0500, Ken Brown wrote: > If I simply run 'make -j13 world' without using the Build script, it > doesn't hang. I don't know if this provides any clue as to where the > problem is. Speaking for myself, it doesn't give me any clues. I don't see why it should matter. But there seem to be a lot of complexities around cygwin and its support for complex POSIX concepts, so I can't say for sure. Maybe someone more familiar with how Cygwin emulates mkfifo() might have some insights.
