[mpich-discuss] All processes only find themselfs

Raffenetti, Ken raffenet at anl.gov
Wed Jul 3 09:54:17 CDT 2024


Hm, there is a PMIx dependency that is presumably coming from the MPICH library. MPICH's mpiexec is not compatible with an external PMIx, so I suspect that is the issue. Can you try setting MPIR_CVAR_PMI_VERSION=1 and see if that works?

Ken

-----Original Message-----
From: Joachim Jenke <jenke at itc.rwth-aachen.de <mailto:jenke at itc.rwth-aachen.de>>
Date: Wednesday, July 3, 2024 at 9:36 AM
To: "Raffenetti, Ken" <raffenet at anl.gov <mailto:raffenet at anl.gov>>, "discuss at mpich.org <mailto:discuss at mpich.org>" <discuss at mpich.org <mailto:discuss at mpich.org>>
Subject: Re: [mpich-discuss] All processes only find themselfs


$ ldd a.out
linux-vdso.so.1 (0x00007ffee8145000)
libmpich.so.12 => /lib/x86_64-linux-gnu/libmpich.so.12 (0x00007f15d3200000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f15d2e00000)
libhwloc.so.15 => /lib/x86_64-linux-gnu/libhwloc.so.15 (0x00007f15d5a13000)
libpmix.so.2 => /lib/x86_64-linux-gnu/libpmix.so.2 (0x00007f15d2a00000)
libucp.so.0 => /lib/x86_64-linux-gnu/libucp.so.0 (0x00007f15d309d000)
libucs.so.0 => /lib/x86_64-linux-gnu/libucs.so.0 (0x00007f15d59ab000)
/lib64/ld-linux-x86-64.so.2 (0x00007f15d5aa3000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f15d2d17000)
libudev.so.1 => /lib/x86_64-linux-gnu/libudev.so.1 (0x00007f15d5978000)
libmunge.so.2 => /lib/x86_64-linux-gnu/libmunge.so.2 (0x00007f15d5970000)
libevent_core-2.1.so.7 => /lib/x86_64-linux-gnu/libevent_core-2.1.so.7 
(0x00007f15d3068000)
libevent_pthreads-2.1.so.7 => 
/lib/x86_64-linux-gnu/libevent_pthreads-2.1.so.7 (0x00007f15d5969000)
libuct.so.0 => /lib/x86_64-linux-gnu/libuct.so.0 (0x00007f15d3022000)
libucm.so.0 => /lib/x86_64-linux-gnu/libucm.so.0 (0x00007f15d594c000)
libcap.so.2 => /lib/x86_64-linux-gnu/libcap.so.2 (0x00007f15d3015000)


$ apt-cache policy libmpich-dev
libmpich-dev:
Installed: 4.2.0-5build3
Candidate: 4.2.0-5build3
Version table:
*** 4.2.0-5build3 500
500 https://urldefense.us/v3/__http://de.archive.ubuntu.com/ubuntu__;!!G_uCfscf7eWS!dclXuitW1RCpXhgp-qZD83ijnwmbJiIbWEfRYNnsS-Cgb1iGZV0W3CPNYNLwn_snqDC0USZi-DatSYi-$  <https://urldefense.us/v3/__http://de.archive.ubuntu.com/ubuntu__;!!G_uCfscf7eWS!dclXuitW1RCpXhgp-qZD83ijnwmbJiIbWEfRYNnsS-Cgb1iGZV0W3CPNYNLwn_snqDC0USZi-DatSYi-$ > noble/universe amd64 
Packages
100 /var/lib/dpkg/status






$ mpirun -np 2 --verbose ./a.out
host: ITC19206
[mpiexec at ITC19206] Timeout set to -1 (-1 means infinite)


==================================================================================================
mpiexec options:
----------------
Base path: /usr/bin/
Launcher: (null)
Debug level: 1
Enable X: -1


Global environment:
-------------------
SHELL=/bin/bash


SESSION_MANAGER=local/ITC19206:@/tmp/.ICE-unix/3236,unix/ITC19206:/tmp/.ICE-unix/3236
QT_ACCESSIBILITY=1
COLORTERM=truecolor
XDG_CONFIG_DIRS=/etc/xdg/xdg-ubuntu:/etc/xdg
XDG_MENU_PREFIX=gnome-
GNOME_DESKTOP_SESSION_ID=this-is-deprecated
MANDATORY_PATH=/usr/share/gconf/ubuntu.mandatory.path
GNOME_SHELL_SESSION_MODE=ubuntu
SSH_AUTH_SOCK=/run/user/1000/keyring/ssh
MEMORY_PRESSURE_WRITE=c29tZSAyMDAwMDAgMjAwMDAwMAA=
XMODIFIERS=@im=ibus
DESKTOP_SESSION=ubuntu
GTK_MODULES=gail:atk-bridge
XDG_SESSION_DESKTOP=ubuntu
XDG_SESSION_TYPE=x11
MODULESHOME=/usr/share/modules
GPG_AGENT_INFO=/run/user/1000/gnupg/S.gpg-agent:0:1
SYSTEMD_EXEC_PID=3274
XAUTHORITY=/run/user/1000/gdm/Xauthority
WINDOWPATH=2
LANG=de_DE.UTF-8


LS_COLORS=rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:mi=00:su=37;41:sg=30;43:ca=00:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arc=01;31:*.arj=01;31:*.taz=01;31:*.lha=01;31:*.lz4=01;31:*.lzh=01;31:*.lzma=01;31:*.tlz=01;31:*.txz=01;31:*.tzo=01;31:*.t7z=01;31:*.zip=01;31:*.z=01;31:*.dz=01;31:*.gz=01;31:*.lrz=01;31:*.lz=01;31:*.lzo=01;31:*.xz=01;31:*.zst=01;31:*.tzst=01;31:*.bz2=01;31:*.bz=01;31:*.tbz=01;31:*.tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.war=01;31:*.ear=01;31:*.sar=01;31:*.rar=01;31:*.alz=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01;31:*.cab=01;31:*.wim=01;31:*.swm=01;31:*.dwm=01;31:*.esd=01;31:*.avif=01;35:*.jpg=01;35:*.jpeg=01;35:*.mjpg=01;35:*.mjpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;35:*.mng=01;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35:*.webm=01;35:*.webp=01;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35:*.nuv=01;35:*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:*.flv=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.yuv=01;35:*.cgm=01;35:*.emf=01;35:*.ogv=01;35:*.ogx=01;35:*.aac=00;36:*.au=00;36:*.flac=00;36:*.m4a=00;36:*.mid=00;36:*.midi=00;36:*.mka=00;36:*.mp3=00;36:*.mpc=00;36:*.ogg=00;36:*.ra=00;36:*.wav=00;36:*.oga=00;36:*.opus=00;36:*.spx=00;36:*.xspf=00;36:*~=00;90:*#=00;90:*.bak=00;90:*.crdownload=00;90:*.dpkg-dist=00;90:*.dpkg-new=00;90:*.dpkg-old=00;90:*.dpkg-tmp=00;90:*.old=00;90:*.orig=00;90:*.part=00;90:*.rej=00;90:*.rpmnew=00;90:*.rpmorig=00;90:*.rpmsave=00;90:*.swp=00;90:*.tmp=00;90:*.ucf-dist=00;90:*.ucf-new=00;90:*.ucf-old=00;90:
XDG_CURRENT_DESKTOP=ubuntu:GNOME


MEMORY_PRESSURE_WATCH=/sys/fs/cgroup/user.slice/user-1000.slice/user at 1000.serv <mailto:user at 1000.serv>ice/session.slice/org.gnome.Shell at x11.serv <mailto:org.gnome.Shell at x11.serv>ice/memory.pressure
VTE_VERSION=7600


GNOME_TERMINAL_SCREEN=/org/gnome/Terminal/screen/63974876_8215_47b9_b16e_caeb54580fbc
QTWEBENGINE_DICTIONARIES_PATH=/usr/share/hunspell-bdic/
LESSCLOSE=/usr/bin/lesspipe %s %s
XDG_SESSION_CLASS=user
TERM=xterm-256color
DEFAULTS_PATH=/usr/share/gconf/ubuntu.default.path
LESSOPEN=| /usr/bin/lesspipe %s
GNOME_TERMINAL_SERVICE=:1.95
LOADEDMODULES=
SHLVL=1
GSM_SKIP_SSH_AGENT_WORKAROUND=true
QT_IM_MODULE=ibus
XDG_RUNTIME_DIR=/run/user/1000
__MODULES_LMINIT=module use --append 
/etc/environment-modules/modules:module use --append 
/usr/share/modules/versions:module use --append 
/usr/share/modules/$MODULE_VERSION/modulefiles:module use --append 
/usr/share/modules/modulefiles
DEBUGINFOD_URLS=https://urldefense.us/v3/__https://debuginfod.ubuntu.com__;!!G_uCfscf7eWS!dclXuitW1RCpXhgp-qZD83ijnwmbJiIbWEfRYNnsS-Cgb1iGZV0W3CPNYNLwn_snqDC0USZi-D6_fHTP$  <https://urldefense.us/v3/__https://debuginfod.ubuntu.com__;!!G_uCfscf7eWS!dclXuitW1RCpXhgp-qZD83ijnwmbJiIbWEfRYNnsS-Cgb1iGZV0W3CPNYNLwn_snqDC0USZi-D6_fHTP$ >


XDG_DATA_DIRS=/usr/share/ubuntu:/usr/share/gnome:/usr/local/share/:/usr/share/:/var/lib/snapd/desktop


PATH=/usr/lib/ccache:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/snap/bin


MODULEPATH=/etc/environment-modules/modules:/usr/share/modules/versions:/usr/share/modules/$MODULE_VERSION/modulefiles:/usr/share/modules/modulefiles
GDMSESSION=ubuntu
DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
MODULES_CMD=/usr/lib/x86_64-linux-gnu/modulecmd.tcl
BASH_FUNC_ml%%=() { module ml "$@"
}
BASH_FUNC_module%%=() { local _mlredir=1;
if [ -n "${MODULES_REDIRECT_OUTPUT+x}" ]; then
if [ "$MODULES_REDIRECT_OUTPUT" = '0' ]; then
_mlredir=0;
else
if [ "$MODULES_REDIRECT_OUTPUT" = '1' ]; then
_mlredir=1;
fi;
fi;
fi;
case " $@ " in
*' --no-redirect '*)
_mlredir=0
;;
*' --redirect '*)
_mlredir=1
;;
esac;
if [ $_mlredir -eq 0 ]; then
_module_raw "$@";
else
_module_raw "$@" 2>&1;
fi
}
BASH_FUNC__module_raw%%=() { eval "$(/usr/bin/tclsh8.6 
'/usr/lib/x86_64-linux-gnu/modulecmd.tcl' bash "$@")";
_mlstatus=$?;
return $_mlstatus
}
_=/usr/bin/mpirun


Hydra internal environment:
---------------------------
GFORTRAN_UNBUFFERED_PRECONNECTED=y




Proxy information:
*********************
[1] proxy: ITC19206 (1 cores)
Exec list: ./a.out (2 processes);




==================================================================================================




Proxy launch args: /usr/bin/hydra_pmi_proxy --control-port 
ITC19206:39745 --debug --rmk user --launcher ssh --demux poll --pgid 0 
--retries 10 --usize -2 --pmi-port 0 --gpus-per-proc -2 
--gpu-subdevs-per-proc -2 --proxy-id


Arguments being passed to proxy 0:
--version 4.2.0 --iface-ip-env-name MPIR_CVAR_CH3_INTERFACE_HOSTNAME 
--hostname ITC19206 --global-core-map 0,1,1 --pmi-id-map 0,0 
--global-process-count 2 --auto-cleanup 1 --pmi-kvsname 
kvs_718180_0_155951620_ITC19206 --pmi-process-mapping (vector,(0,1,2)) 
--global-inherited-env 57 'SHELL=/bin/bash' 
'SESSION_MANAGER=local/ITC19206:@/tmp/.ICE-unix/3236,unix/ITC19206:/tmp/.ICE-unix/3236' 
'QT_ACCESSIBILITY=1' 'COLORTERM=truecolor' 
'XDG_CONFIG_DIRS=/etc/xdg/xdg-ubuntu:/etc/xdg' 'XDG_MENU_PREFIX=gnome-' 
'GNOME_DESKTOP_SESSION_ID=this-is-deprecated' 
'MANDATORY_PATH=/usr/share/gconf/ubuntu.mandatory.path' 
'GNOME_SHELL_SESSION_MODE=ubuntu' 
'SSH_AUTH_SOCK=/run/user/1000/keyring/ssh' 
'MEMORY_PRESSURE_WRITE=c29tZSAyMDAwMDAgMjAwMDAwMAA=' 
'XMODIFIERS=@im=ibus' 'DESKTOP_SESSION=ubuntu' 
'GTK_MODULES=gail:atk-bridge' 'XDG_SESSION_DESKTOP=ubuntu' 
'XDG_SESSION_TYPE=x11' 'MODULESHOME=/usr/share/modules' 
'GPG_AGENT_INFO=/run/user/1000/gnupg/S.gpg-agent:0:1' 
'SYSTEMD_EXEC_PID=3274' 'XAUTHORITY=/run/user/1000/gdm/Xauthority' 
'WINDOWPATH=2' 'LANG=de_DE.UTF-8' 
'LS_COLORS=rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:mi=00:su=37;41:sg=30;43:ca=00:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arc=01;31:*.arj=01;31:*.taz=01;31:*.lha=01;31:*.lz4=01;31:*.lzh=01;31:*.lzma=01;31:*.tlz=01;31:*.txz=01;31:*.tzo=01;31:*.t7z=01;31:*.zip=01;31:*.z=01;31:*.dz=01;31:*.gz=01;31:*.lrz=01;31:*.lz=01;31:*.lzo=01;31:*.xz=01;31:*.zst=01;31:*.tzst=01;31:*.bz2=01;31:*.bz=01;31:*.tbz=01;31:*.tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.war=01;31:*.ear=01;31:*.sar=01;31:*.rar=01;31:*.alz=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01;31:*.cab=01;31:*.wim=01;31:*.swm=01;31:*.dwm=01;31:*.esd=01;31:*.avif=01;35:*.jpg=01;35:*.jpeg=01;35:*.mjpg=01;35:*.mjpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;35:*.mng=01;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35:*.webm=01;35:*.webp=01;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35:*.nuv=01;35:*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:*.flv=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.yuv=01;35:*.cgm=01;35:*.emf=01;35:*.ogv=01;35:*.ogx=01;35:*.aac=00;36:*.au=00;36:*.flac=00;36:*.m4a=00;36:*.mid=00;36:*.midi=00;36:*.mka=00;36:*.mp3=00;36:*.mpc=00;36:*.ogg=00;36:*.ra=00;36:*.wav=00;36:*.oga=00;36:*.opus=00;36:*.spx=00;36:*.xspf=00;36:*~=00;90:*#=00;90:*.bak=00;90:*.crdownload=00;90:*.dpkg-dist=00;90:*.dpkg-new=00;90:*.dpkg-old=00;90:*.dpkg-tmp=00;90:*.old=00;90:*.orig=00;90:*.part=00;90:*.rej=00;90:*.rpmnew=00;90:*.rpmorig=00;90:*.rpmsave=00;90:*.swp=00;90:*.tmp=00;90:*.ucf-dist=00;90:*.ucf-new=00;90:*.ucf-old=00;90:' 
'XDG_CURRENT_DESKTOP=ubuntu:GNOME' 
'MEMORY_PRESSURE_WATCH=/sys/fs/cgroup/user.slice/user-1000.slice/user at 1000.serv <mailto:user at 1000.serv>ice/session.slice/org.gnome.Shell at x11.serv <mailto:org.gnome.Shell at x11.serv>ice/memory.pressure' 
'VTE_VERSION=7600' 
'GNOME_TERMINAL_SCREEN=/org/gnome/Terminal/screen/63974876_8215_47b9_b16e_caeb54580fbc' 
'QTWEBENGINE_DICTIONARIES_PATH=/usr/share/hunspell-bdic/' 
'LESSCLOSE=/usr/bin/lesspipe %s %s' 'XDG_SESSION_CLASS=user' 
'TERM=xterm-256color' 
'DEFAULTS_PATH=/usr/share/gconf/ubuntu.default.path' 'LESSOPEN=| 
/usr/bin/lesspipe %s' 'GNOME_TERMINAL_SERVICE=:1.95' 'LOADEDMODULES=' 
'SHLVL=1' 'GSM_SKIP_SSH_AGENT_WORKAROUND=true' 'QT_IM_MODULE=ibus' 
'XDG_RUNTIME_DIR=/run/user/1000' '__MODULES_LMINIT=module use --append 
/etc/environment-modules/modules:module use --append 
/usr/share/modules/versions:module use --append 
/usr/share/modules/$MODULE_VERSION/modulefiles:module use --append 
/usr/share/modules/modulefiles' 
'DEBUGINFOD_URLS=https://urldefense.us/v3/__https://debuginfod.ubuntu.com__;!!G_uCfscf7eWS!dclXuitW1RCpXhgp-qZD83ijnwmbJiIbWEfRYNnsS-Cgb1iGZV0W3CPNYNLwn_snqDC0USZi-D6_fHTP$  <https://urldefense.us/v3/__https://debuginfod.ubuntu.com__;!!G_uCfscf7eWS!dclXuitW1RCpXhgp-qZD83ijnwmbJiIbWEfRYNnsS-Cgb1iGZV0W3CPNYNLwn_snqDC0USZi-D6_fHTP$ > ' 
'XDG_DATA_DIRS=/usr/share/ubuntu:/usr/share/gnome:/usr/local/share/:/usr/share/:/var/lib/snapd/desktop' 
'PATH=/usr/lib/ccache:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/snap/bin' 
'MODULEPATH=/etc/environment-modules/modules:/usr/share/modules/versions:/usr/share/modules/$MODULE_VERSION/modulefiles:/usr/share/modules/modulefiles' 
'GDMSESSION=ubuntu' 
'DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus' 
'MODULES_CMD=/usr/lib/x86_64-linux-gnu/modulecmd.tcl' 'BASH_FUNC_ml%%=() 
{ module ml "$@"
}' 'BASH_FUNC_module%%=() { local _mlredir=1;
if [ -n "${MODULES_REDIRECT_OUTPUT+x}" ]; then
if [ "$MODULES_REDIRECT_OUTPUT" = '0' ]; then
_mlredir=0;
else
if [ "$MODULES_REDIRECT_OUTPUT" = '1' ]; then
_mlredir=1;
fi;
fi;
fi;
case " $@ " in
*' --no-redirect '*)
_mlredir=0
;;
*' --redirect '*)
_mlredir=1
;;
esac;
if [ $_mlredir -eq 0 ]; then
_module_raw "$@";
else
_module_raw "$@" 2>&1;
fi
}' 'BASH_FUNC__module_raw%%=() { eval "$(/usr/bin/tclsh8.6 
'/usr/lib/x86_64-linux-gnu/modulecmd.tcl' bash "$@")";
_mlstatus=$?;
return $_mlstatus
}' '_=/usr/bin/mpirun' --global-user-env 0 --global-system-env 1 
'GFORTRAN_UNBUFFERED_PRECONNECTED=y' --proxy-core-count 1 --exec 
--exec-appnum 0 --exec-proc-count 2 --exec-local-env 0 --exec-wdir [...] 
--exec-args 1 ./a.out


[mpiexec at ITC19206] Launch arguments: /usr/bin/hydra_pmi_proxy 
--control-port ITC19206:39745 --debug --rmk user --launcher ssh --demux 
poll --pgid 0 --retries 10 --usize -2 --pmi-port 0 --gpus-per-proc -2 
--gpu-subdevs-per-proc -2 --proxy-id 0
[proxy:0 at ITC19206] Sending upstream hdr.cmd = CMD_PID_LIST
[proxy:0 at ITC19206] Sending upstream hdr.cmd = CMD_STDOUT
[proxy:0 at ITC19206] Sending upstream hdr.cmd = CMD_STDOUT
Hello, I am 0 of 1 tasks.
Hello, I am 0 of 1 tasks.
[proxy:0 at ITC19206] Sending upstream hdr.cmd = CMD_EXIT_STATUS






Am 03.07.24 um 16:25 schrieb Raffenetti, Ken:
> Can you confirm which MPI library you binary is linked with using ldd? Adding -v to the mpirun command should also provide some clues in the PMI client/server traffic.
> 
> Ken
> 
> -----Original Message-----
> From: Joachim Jenke via discuss <discuss at mpich.org <mailto:discuss at mpich.org> <mailto:discuss at mpich.org <mailto:discuss at mpich.org>>>
> Reply-To: "discuss at mpich.org <mailto:discuss at mpich.org> <mailto:discuss at mpich.org <mailto:discuss at mpich.org>>" <discuss at mpich.org <mailto:discuss at mpich.org> <mailto:discuss at mpich.org <mailto:discuss at mpich.org>>>
> Date: Wednesday, July 3, 2024 at 5:16 AM
> To: "discuss at mpich.org <mailto:discuss at mpich.org> <mailto:discuss at mpich.org <mailto:discuss at mpich.org>>" <discuss at mpich.org <mailto:discuss at mpich.org> <mailto:discuss at mpich.org <mailto:discuss at mpich.org>>>
> Cc: Joachim Jenke <jenke at itc.rwth-aachen.de <mailto:jenke at itc.rwth-aachen.de> <mailto:jenke at itc.rwth-aachen.de <mailto:jenke at itc.rwth-aachen.de>>>
> Subject: [mpich-discuss] All processes only find themselfs
> 
> 
> Hi all,
> 
> 
> after upgrading my notebook to Ubuntu 24.04, each processes thinks that
> MPI_COMM_WORLD only consists of its own process:
> 
> 
> $ mpirun -np 2 -l ./a.out
> [1] Hello, I am 0 of 1 tasks.
> [0] Hello, I am 0 of 1 tasks.
> 
> 
> Any suggestions what could go wrong?
> 
> 
> 
> 
> $ mpirun --version
> HYDRA build details:
> Version: 4.2.0
> Release Date: Fri Feb 9 12:29:21 CST 2024
> CC: gcc -Wdate-time
> -D_FORTIFY_SOURCE=3 -g -O2 -fno-omit-frame-pointer
> -mno-omit-leaf-frame-pointer
> -ffile-prefix-map=/build/mpich-C3oteG/mpich-4.2.0=. -flto=auto
> -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection
> -Wformat -Werror=format-security -fcf-protection
> -fdebug-prefix-map=/build/mpich-C3oteG/mpich-4.2.0=/usr/src/mpich-4.2.0-5build3
> -Wl,-Bsymbolic-functions -flto=auto -ffat-lto-objects -Wl,-z,relro
> Configure options: '--with-hwloc-prefix=/usr'
> '--with-device=ch4:ucx' 'FFLAGS=-O2 -fno-omit-frame-pointer
> -mno-omit-leaf-frame-pointer
> -ffile-prefix-map=/build/mpich-C3oteG/mpich-4.2.0=. -flto=auto
> -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection
> -fcf-protection
> -fdebug-prefix-map=/build/mpich-C3oteG/mpich-4.2.0=/usr/src/mpich-4.2.0-5build3
> -fallow-invalid-boz -fallow-argument-mismatch' '--prefix=/usr'
> 'CFLAGS=-g -O2 -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer
> -ffile-prefix-map=/build/mpich-C3oteG/mpich-4.2.0=. -flto=auto
> -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection
> -Wformat -Werror=format-security -fcf-protection
> -fdebug-prefix-map=/build/mpich-C3oteG/mpich-4.2.0=/usr/src/mpich-4.2.0-5build3'
> 'LDFLAGS=-Wl,-Bsymbolic-functions -flto=auto -ffat-lto-objects
> -Wl,-z,relro' 'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=3'
> Process Manager: pmi
> Launchers available: ssh rsh fork slurm ll lsf
> sge manual persist
> Topology libraries available: hwloc
> Resource management kernels available: user slurm ll lsf sge pbs
> cobalt
> Demux engines available: poll select
> 
> 
> Best
> Joachim
> 
> 


-- 
Dr. rer. nat. Joachim Jenke


IT Center
Group: High Performance Computing
Division: Computational Science and Engineering
RWTH Aachen University
Seffenter Weg 23
D 52074 Aachen (Germany)
Tel: +49 241 80- 24765
Fax: +49 241 80-624765
jenke at itc.rwth-aachen.de <mailto:jenke at itc.rwth-aachen.de>
https://urldefense.us/v3/__http://www.itc.rwth-aachen.de__;!!G_uCfscf7eWS!dclXuitW1RCpXhgp-qZD83ijnwmbJiIbWEfRYNnsS-Cgb1iGZV0W3CPNYNLwn_snqDC0USZi-JjOzVxg$ 







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