Windows has neither host nor traceroute. hostname is from cygwin [this is fine].
equivalent of traceroute is tracert And for `host` recommendation is to use nslookup https://stackoverflow.com/questions/21520191/unix-command-host-is-there-windows-equivalent I think its best to: - improve this test [with host - and fallback to traceroute/tracert - if host not found] - make this a warning - instead of error. [as the error case won't prevent any e-mails - it can increase due to false positives and negatives - if any] Satish On Fri, 18 Sep 2020, Satish Balay via petsc-users wrote: > Its probably better to just run a test with gethostbyname()? > > The closest thing I can think off is: > > > I don't know if 'traceroute' or 'host' commands are universally available. > > >>>>>> > balay@sb /home/balay > $ host `hostname` > sb has address 192.168.0.144 > balay@sb /home/balay > $ echo $? > 0 > balay@sb /home/balay > $ host foobar > Host foobar not found: 3(NXDOMAIN) > balay@sb /home/balay > $ echo $? > 1 > balay@sb /home/balay > $ > <<<<<< > > However - I fear if there are *any* false positives - or false negatives - > this test will generate more e-mail than the actual issue [of misbehaving MPI] > > Satish > > On Fri, 18 Sep 2020, Barry Smith wrote: > > > > > try > > > > /usr/sbin/traceroute `hostname` > > > > > > > On Sep 18, 2020, at 10:07 AM, Mark Adams <mfad...@lbl.gov> wrote: > > > > > > Let me know if you want anything else. > > > Thanks, > > > Mark > > > > > > On Fri, Sep 18, 2020 at 11:05 AM Mark Adams <mfad...@lbl.gov > > > <mailto:mfad...@lbl.gov>> wrote: > > > > > > > > > On Fri, Sep 18, 2020 at 11:04 AM Satish Balay <ba...@mcs.anl.gov > > > <mailto:ba...@mcs.anl.gov>> wrote: > > > On Fri, 18 Sep 2020, Satish Balay via petsc-users wrote: > > > > > > > > >> 07:41 master *= ~/Codes/petsc$ ping -c 2 MarksMac-302.local > > > > > >> PING marksmac-302.local (127.0.0.1): 56 data bytes > > > > > > > > So it is resolving MarksMac-302.local as 127.0.0.1 - but ping is not > > > > responding? > > > > > > > > I know some machines don't respond to external ping [and firewalls can > > > > block it] but don't really know if they always respond to internal ping > > > > or not. > > > > > > > > If some machines don't respond to internal ping - then we can't use > > > > ping test in configure [it will create false negatives - as in this > > > > case] > > > > > > BTW: To confirm, please try: > > > > > > ping 127.0.0.1 > > > > > > > > > 11:02 master *= ~/Codes/petsc$ sudo vi /etc/hosts > > > 11:02 master *= ~/Codes/petsc$ ping 127.0.0.1 > > > PING 127.0.0.1 (127.0.0.1): 56 data bytes > > > Request timeout for icmp_seq 0 > > > Request timeout for icmp_seq 1 > > > Request timeout for icmp_seq 2 > > > Request timeout for icmp_seq 3 > > > Request timeout for icmp_seq 4 > > > Request timeout for icmp_seq 5 > > > Request timeout for icmp_seq 6 > > > Request timeout for icmp_seq 7 > > > Request timeout for icmp_seq 8 > > > Request timeout for icmp_seq 9 > > > Request timeout for icmp_seq 10 > > > Request timeout for icmp_seq 11 > > > Request timeout for icmp_seq 12 > > > Request timeout for icmp_seq 13 > > > Request timeout for icmp_seq 14 > > > Request timeout for icmp_seq 15 > > > Request timeout for icmp_seq 16 > > > Request timeout for icmp_seq 17 > > > Request timeout for icmp_seq 18 > > > Request timeout for icmp_seq 19 > > > Request timeout for icmp_seq 20 > > > Request timeout for icmp_seq 21 > > > > > > still going ...... > > > > > > > > > Satish > > > > > > > > > > > > > > > Mark, can you remove the line that you added to /etc/hosts - i.e: > > > > > > > > 127.0.0.1 MarksMac-302.local > > > > > > > > And now rerun MPI tests. Do they work or fail? > > > > > > > > [this is to check if this test is a false positive on your machine] > > > > > > > > Satish > > > > > > > > > > > > On Fri, 18 Sep 2020, Mark Adams wrote: > > > > > > > > > On Fri, Sep 18, 2020 at 7:51 AM Matthew Knepley <knep...@gmail.com > > > > > <mailto:knep...@gmail.com>> wrote: > > > > > > > > > > > On Fri, Sep 18, 2020 at 7:46 AM Mark Adams <mfad...@lbl.gov > > > > > > <mailto:mfad...@lbl.gov>> wrote: > > > > > > > > > > > >> Oh you did not change my hostname: > > > > > >> > > > > > >> 07:37 master *= ~/Codes/petsc$ hostname > > > > > >> MarksMac-302.local > > > > > >> 07:41 master *= ~/Codes/petsc$ ping -c 2 MarksMac-302.local > > > > > >> PING marksmac-302.local (127.0.0.1): 56 data bytes > > > > > >> Request timeout for icmp_seq 0 > > > > > >> > > > > > >> --- marksmac-302.local ping statistics --- > > > > > >> 2 packets transmitted, 0 packets received, 100.0% packet loss > > > > > >> 07:42 2 master *= ~/Codes/petsc$ > > > > > >> > > > > > > > > > > > > This does not make sense to me. You have > > > > > > > > > > > > 127.0.0.1 MarksMac-302.local > > > > > > > > > > > > in /etc/hosts, > > > > > > > > > > > > > > > > 09:07 ~/.ssh$ cat /etc/hosts > > > > > ## > > > > > # Host Database > > > > > # > > > > > # localhost is used to configure the loopback interface > > > > > # when the system is booting. Do not change this entry. > > > > > ## > > > > > 127.0.0.1 localhost > > > > > 255.255.255.255 broadcasthost > > > > > 127.0.0.1 MarksMac-5.local > > > > > 127.0.0.1 243.124.240.10.in-addr.arpa.private.cam.ac.uk > > > > > <http://243.124.240.10.in-addr.arpa.private.cam.ac.uk/> > > > > > 127.0.0.1 MarksMac-302.local > > > > > 09:07 ~/.ssh$ > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > but you cannot resolve that name? > > > > > > > > > > > > Matt > > > > > > > > > > > > > > > > > >> BTW, I used to get messages about some network issue and 'changing > > > > > >> host > > > > > >> name to MarksMac-[x+1].local'. That is, the original hostname > > > > > >> was MarksMac.local, then I got a message about changing > > > > > >> to MarksMac-1.local, etc. I have not seen these messages for > > > > > >> months but > > > > > >> apparently this process has continued unabated. > > > > > >> > > > > > >> > > > > > >> > > > > > >> > > > > > >> > > > > > >> > > > > > >> > > > > > >> > > > > > >> > > > > > >> On Thu, Sep 17, 2020 at 11:10 PM Satish Balay via petsc-users < > > > > > >> petsc-users@mcs.anl.gov <mailto:petsc-users@mcs.anl.gov>> wrote: > > > > > >> > > > > > >>> On Thu, 17 Sep 2020, Matthew Knepley wrote: > > > > > >>> > > > > > >>> > On Thu, Sep 17, 2020 at 8:33 PM Barry Smith <bsm...@petsc.dev > > > > > >>> > <mailto:bsm...@petsc.dev>> wrote: > > > > > >>> > > > > > > >>> > > > On Sep 17, 2020, at 4:59 PM, Satish Balay via petsc-users < > > > > > >>> > > petsc-users@mcs.anl.gov <mailto:petsc-users@mcs.anl.gov>> > > > > > >>> > > wrote: > > > > > >>> > > > > > > > > >>> > > > Here is a fix: > > > > > >>> > > > > > > > > >>> > > > echo 127.0.0.1 `hostname` | sudo tee -a /etc/hosts > > > > > >>> > > > > > > > >>> > > Satish, > > > > > >>> > > > > > > > >>> > > I don't think you want to be doing this on a Mac (on > > > > > >>> > > anything?) > > > > > >>> On a > > > > > >>> > > Mac based on the network configuration etc as it boots up and > > > > > >>> > > as > > > > > >>> networks > > > > > >>> > > are accessible or not (wi-fi) it determines what hostname > > > > > >>> > > should be, > > > > > >>> one > > > > > >>> > > should never being hardwiring it to some value. > > > > > >>> > > > > > > > >>> > > > > > > >>> > Satish is just naming the loopback interface. I did this on all > > > > > >>> > my > > > > > >>> former > > > > > >>> > Macs. > > > > > >>> > > > > > >>> > > > > > >>> Yes - this doesn't change the hostname. Its just adding an entry > > > > > >>> for > > > > > >>> gethostbyname - for current hostname. > > > > > >>> > > > > > >>> >>> > > > > > >>> 127.0.0.1 MarksMac-302.local > > > > > >>> <<< > > > > > >>> > > > > > >>> Sure - its best to not do this when one has a proper IP name [like > > > > > >>> foo.mcs.anl.gov <http://foo.mcs.anl.gov/>] - but its useful when > > > > > >>> one has a hostname like > > > > > >>> "MarksMac-302.local" -that is not DNS resolvable > > > > > >>> > > > > > >>> Even if the machine is moved to a different network with a > > > > > >>> different > > > > > >>> name - the current entry won't cause problems [but will need > > > > > >>> another entry > > > > > >>> for the new host name - if this new name is also not DNS > > > > > >>> resolvable] > > > > > >>> > > > > > >>> Its likely this file is a generated file on macos - so might > > > > > >>> get reset > > > > > >>> on reboot - or some network change? [if this is the case - the > > > > > >>> change won't > > > > > >>> be permanent] > > > > > >>> > > > > > >>> > > > > > >>> Satish > > > > > >>> > > > > > >> > > > > > > > > > > > > -- > > > > > > What most experimenters take for granted before they begin their > > > > > > experiments is infinitely more interesting than any results to > > > > > > which their > > > > > > experiments lead. > > > > > > -- Norbert Wiener > > > > > > > > > > > > https://www.cse.buffalo.edu/~knepley/ > > > > > > <https://www.cse.buffalo.edu/~knepley/> > > > > > > <http://www.cse.buffalo.edu/~knepley/ > > > > > > <http://www.cse.buffalo.edu/~knepley/>> > > > > > > > > > > > > > > > > > > > > > > >
