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Line 15: − + − − “looks\seems like yes/no” - i found only unproved message(s) saying “yes”/“no” − “not yet” - it is officially planned or i found no reasons, why it can’t be done.+ + − {| style="border-spacing:0;"+ − | style="border:1pt solid #000000;padding:0.176cm;"| − | style="border:1pt solid #000000;padding:0.176cm;"| CRIU − | style="border:1pt solid #000000;padding:0.176cm;"| DMTCP − | style="border:1pt solid #000000;padding:0.176cm;"| BLCR − |-+ − | style="background-color:#dc2300;border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| − | style="background-color:#dc2300;border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| − | style="background-color:#dc2300;border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| − | style="background-color:#dc2300;border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| − |-+ − | style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| arch − | style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| x86_64, ARM − | style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| x86, x86_64, ARM − | style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| x86,x86_64,PPC/PPC64,ARM − |-+ − | style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| OS − | colspan="3" style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| <center>Linux</center> − |-+ − | style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| modified kernel − | style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes, but only for some extra features. − All unnecessary features are already in new kernel versions+ − | style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| no+ − | style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| no, module can be simply modprobed+ + − problems with installation on new kernels + − | style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| special libs + + + + + − + − + − + − + − + + − + − + − + − + + − + − + − + − + − + − there are some difficulties with statically linked applications, and with LinuxThreads (cuz it does not support them at all) − − − − + − + − + − + − It preloadsthe DMTCP library. That library runs before the routinemain(). It creates a second thread. Thecheckpoint thread then creates a socket to the DMTCP coordinator andregisters itself. The checkpoint thread also creates a signal handler.+ − − − − − − CR shall notify processes when a checkpoint is to occur (before the kernel takes a checkpoint) to − − allow the processes to prepare itself accordingly. − − − − + − + − + − + − + − − − because of wrappers on system calls − − − − − − because of wrappers on system calls − + − + − + − + + − + − + − + − even if kernel ,libs, etc are newer+ − + − − Can use Memory Changes Tracking to decrease time for dumping − | style="border:1pt solid #000000;padding:0.176cm;"| yes − − if both kernels are recent − − − but if all is the same! − − − if even prelinked addresses are different,it will not restore − − − But it can save the whole used libs and localization files to restore program on the different machine − + − + − + − LXC and OpenVZ containers+ − + − − It doesn't support namespaces, so it probably can’t dump containers − − − − | style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| looks like no − + − + − | style="border:1pt solid #000000;padding:0.176cm;"| yes+ − + − OpenMPI, MPICH2, OpenMP, Cilk are alredy supported and Infiniband is in progress.+ − − − Cray MPI, Intel MPI, LAM/MPI, MPICH-V, MPICH2, MVAPICH, Open MPI, SGI MPT − + − + − + − + + − + − + − + − + − + − − − + − + − + − + − Plugins and API+ − − − − | style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| not yet − + + + + + − |- − | style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| unix sockets − | style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes,all kinds − | style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes − | style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| no − + − + − + − + − developers of dmtcp had no request for this+ − − + − | style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes − | style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes − | style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| not yet − + − + − + − + − but you can write a simple DMTCP plugin that tells DMTCP how you want to reconnect on restart + − | style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| no − + − + − + − + − developing is on the half-way+ − − + − + − + − + + − + − + − + − + + − + − + − + − + + − + − + − + − + + − + − + − + − + + − + − + − + − + + − + − + − + − + + − + − + − + − + + − + − + − + − + + − + − + − + − + + − + − + − + − + + − + − + − + − + + − + − + − + − + − + − − − − | style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes − + − + − + − + − + − − − − − − + − + − + − + − + − − | style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| Shared resources (files, mm, etc.)+ − + − + − + − + − − − − − − + − + − + − + − + − − + − + − + − but /dev/null, /dev/zero, etc. are supported+ − + − − − − − but /dev/null and − − − + − + − + − + +
Comparison to other CR projects (edit)
Revision as of 19:20, 9 December 2015
, 19:20, 9 December 2015added absent architectures for criu
This pages tries to explain differences between CRIU and other C/R solutions.
This pages tries to explain differences between CRIU and other C/R solutions.
== [http://dmtcp.sourceforge.net DMTCP] ==
== DMTCP ==
{{:DMTCP}}
{{:DMTCP}}
== [https://ftg.lbl.gov/projects/CheckpointRestart BLCR] ==
== BLCR ==
Berkeley Lab Checkpoint/Restart (BLCR) is a part of the Scalable Systems Software Suite ,
Berkeley Lab Checkpoint/Restart (BLCR) is a part of the Scalable Systems Software Suite ,
small LGPL-licensed library.
small LGPL-licensed library.
== [http://criu.org CRIU], [http://dmtcp.sourceforge.net DMTCP], [https://ftg.lbl.gov/projects/CheckpointRestart BLCR] ==
== PinLIT / PinPlay ==
PinLIT (Pin-Long Instruction Trace) is a checkpointing tool built on top of Intel's proprietary [https://software.intel.com/en-us/articles/pin-a-dynamic-binary-instrumentation-tool PIN binary instrumentation tool] described on page 48 of [https://cseweb.ucsd.edu/~calder/papers/thesis-cristiano.pdf Cristiano Pereira's PhD thesis]. It records the processor's (big) architectural register state and all pages of memory that contain application and shared library code, optimizing size by only storing memory used during a desired interval.
[https://software.intel.com/en-us/articles/program-recordreplay-toolkit PinPlay] or the Program Record/Replay Toolkit appears to be the successor of or new name for PinLIT.
Both tools appear primarily focused on reducing benchmark runtime on slow computer architecture simulators, leveraging sampling algorithms such as SimPoint.
== OpenVZ (in-kernel) ==
Legacy OpenVZ (RHEL4, RHEL5, RHEL6 based kernels) has in-kernel checkpoint/restore, sources can be found in kernel/cpt/.
== CKPT (in-kernel) ==
(In-kernel) [https://ckpt.wiki.kernel.org/index.php/Main_Page Linux Checkpoint/Restart] was a project from around 2008 to around 2010 to implement checkpoint/restart of Linux processes.
== CRIU, DMTCP, BLCR, OpenVZ comparison table ==
“looks\seems like yes/no” - i found only unproved message(s) saying “yes”/“no”
“not yet” - it is officially planned or i found no reasons, why it can’t be done.
{| class="wikitable sortable"
|-
|-
!
! CRIU
! DMTCP
! BLCR
! OpenVZ
|-
| Arch
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| no
| x86_64, ARM, AArch64, PPC64le
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes
| x86, x86_64, ARM
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes
| x86, x86_64, PPC/PPC64, ARM
| x86, x86_64
|-
|-
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| root privileges
| OS
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes, otherwise it would be unsafe,because,for example, of parasite code
| Linux
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| no
| Linux
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| no
| Linux
| Linux
|-
|-
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| need to modify programs
| Uses standard kernel?
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| no
| {{Yes}}, provided it's 3.11 or later
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| no
| {{Yes}}
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes
| {{Yes}}, just needs to load module
| {{No}}. OpenVZ kernel is required
|-
|-
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| need to prepare tasks
| Can be used without preloading special libraries before app start?
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| no
| {{Yes}}
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes
| {{No}}
| {{No}}
| {{Yes}}
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes
|-
|-
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| Does it change behavior of the c/r-ed programs?
| Can be used as non-root user?
| {{Yes}}, but user can only manipulate tasks belonging to him
| {{Yes}}
| {{Yes}}
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| no
| {{No}}
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes
|-
|-
| style="background-color:#008000;border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"|
| Can run unmodified programs?
| style="background-color:#008000;border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"|
| {{Yes}}
| style="background-color:#008000;border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"|
| {{Yes}}
| style="background-color:#008000;border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"|
| {{No}}. Statically linked and/or threaded apps are unsupported.
| {{Yes}}
|-
|-
| style="border:1pt solid #000000;padding:0.176cm;"| migration
| Can run unprepared tasks?
| style="border:1pt solid #000000;padding:0.176cm;"| yes
| {{Yes}}
| {{No}}. It preloads the DMTCP library. That library runs before the routine main(). It creates a second thread. The checkpoint thread then creates a socket to the DMTCP coordinator and registers itself. The checkpoint thread also creates a signal handler.
| {{No}}. CR shall notify processes when a checkpoint is to occur (before the kernel takes a checkpoint) to allow the processes to prepare itself accordingly.
| {{Yes}}
| style="border:1pt solid #000000;padding:0.176cm;"| yes
|-
|-
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| Containers
| Retains behavior of the c/r-ed programs?
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes
| {{Yes}} (but see [[What can change after C/R]])
| {{No}}, because of wrappers on system calls
| {{No}}, because of wrappers on system calls
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| looks like no
| {{Yes}}
|-
|-
| style="border:1pt solid #000000;padding:0.176cm;"| parallel/distributed computations
| Live migration
| style="border:1pt solid #000000;padding:0.176cm;"| no
| {{Yes}}, even if kernel, libs, etc are newer. Can use [[memory changes tracking]] to decrease freeze time
| {{Yes}}, if both kernels are recent
| {{Yes}}, but if all components are the same. Even if prelinked addresses are different, it will not restore, but it can save the whole used libs and localization files to restore program on the different machine
| {{Yes}}
| style="border:1pt solid #000000;padding:0.176cm;"| yes
|-
|-
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| c\r gdb with debugging app
| Containers
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| no, because they are using the same interface
| {{Yes}}, LXC and OpenVZ containers
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes
| {{No}}. It doesn't support namespaces, so it probably can’t dump containers
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| no
| {{No|Looks like no}}
| {{Yes}}
|-
|-
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| X-Windows graphics programs (KDE, GNOME, etc)
| Parallel/distributed computations libraries
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes, by using vnc
| {{No}} (planned)
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes, by using vnc
| {{Yes}}. OpenMPI, MPICH2, OpenMP, Cilk are alredy supported and Infiniband is in progress
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| seems like no
| {{Yes}}. Cray MPI, Intel MPI, LAM/MPI, MPICH-V, MPICH2, MVAPICH, Open MPI, SGI MPT
| {{Yes}}
|-
|-
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| Solutions for invocation in the custom software
| Possible to C/R of gdb with debugged app?
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| not yet
| {{No}}, because they are using the same interface
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes
| {{Yes}}
| {{No}}
| {{Yes}}
|-
|-
| colspan="4" style="background-color:#800080;border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"|
| X Window apps (KDE, GNOME, etc)
| {{Yes}}, via VNC
| {{Yes}}, via VNC
| {{No|Looks like no}}
| {{Yes}}, via VNC
|-
|-
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| udp sockets
| Solutions for invocation in the custom software
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes, both ipv4 and ipv6
| {{Yes}}, [[RPC]] and [[C API]]
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| not yet
| {{Yes}}, plugins and API
| {{No|Not yet}}
| {{Yes}}, via ioctl calls
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| not yet
|-
|-
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| tcp sockets
| colspan="4" |
|-
|-
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| remote tcp connection
| Unix sockets
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes
| {{Yes}}
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| not yet
| {{Yes}}
| {{No}}
| {{Yes}}
|-
|-
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| Infiniband
| UDP sockets
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| no
| {{Yes}}, both ipv4 and ipv6
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| not yet
| {{No|Not yet}}. Developers of dmtcp had no request for this
| {{No|Not yet}}
| {{Yes}}
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| no
|-
|-
| style="background-color:#008080;border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"|
| TCP sockets
| style="background-color:#008080;border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"|
| {{Yes}}
| style="background-color:#008080;border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"|
| {{Yes}}
| style="background-color:#008080;border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"|
| {{No|Not yet}}
| {{Yes}}
|-
|-
| style="border:1pt solid #000000;padding:0.176cm;"| multithread support
| Established TCP connection
| style="border:1pt solid #000000;padding:0.176cm;"| yes
| {{Yes}}
| style="border:1pt solid #000000;padding:0.176cm;"| yes
| {{No}}, but you can write a simple DMTCP plugin that tells DMTCP how you want to reconnect on restart
| style="border:1pt solid #000000;padding:0.176cm;"| yes
| {{No}}
| {{Yes}}
|-
|-
| style="border:1pt solid #000000;padding:0.176cm;"| multiprocess
| Infiniband
| style="border:1pt solid #000000;padding:0.176cm;"| yes
| {{No}}
| style="border:1pt solid #000000;padding:0.176cm;"| yes
| {{No|Not yet, developing is on the half-way}}
| style="border:1pt solid #000000;padding:0.176cm;"| yes
| {{No}}
| {{No}}
|-
|-
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| process groups
| Multithread support
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes
| {{Yes}}
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes
| {{Yes}}
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| not yet
| {{Yes}}
| {{Yes}}
|-
|-
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| zombies
| Multiprocess
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes
| {{Yes}}
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| no
| {{Yes}}
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| no
| {{Yes}}
| {{Yes}}
|-
|-
| style="border:1pt solid #000000;padding:0.176cm;"| namespaces
| Process groups and sessions
| style="border:1pt solid #000000;padding:0.176cm;"| yes
| {{Yes}}
| style="border:1pt solid #000000;padding:0.176cm;"| no
| {{Yes}}
| style="border:1pt solid #000000;padding:0.176cm;"| no
| {{No|Not yet}}
| {{Yes}}
|-
|-
| style="border:1pt solid #000000;padding:0.176cm;"| sessions
| Zombies
| style="border:1pt solid #000000;padding:0.176cm;"| yes
| {{Yes}}
| style="border:1pt solid #000000;padding:0.176cm;"| yes
| {{No}}
| style="border:1pt solid #000000;padding:0.176cm;"| not yet
| {{No}}
| {{Yes}}
|-
|-
| style="border:1pt solid #000000;padding:0.176cm;"| Ptraced programs
| Namespaces
| style="border:1pt solid #000000;padding:0.176cm;"| no
| {{Yes}}
| style="border:1pt solid #000000;padding:0.176cm;"| yes
| {{No}}
| style="border:1pt solid #000000;padding:0.176cm;"| no
| {{No}}
| {{Yes}}
|-
|-
| style="border:1pt solid #000000;padding:0.176cm;"| System V IPC
| Ptraced programs
| style="border:1pt solid #000000;padding:0.176cm;"| yes
| {{No}}
| style="border:1pt solid #000000;padding:0.176cm;"| yes
| {{Yes}}
| style="border:1pt solid #000000;padding:0.176cm;"| no
| {{No}}
| {{Yes}}
|-
|-
| style="border:1pt solid #000000;padding:0.176cm;"| memory mappings
| System V IPC
| style="border:1pt solid #000000;padding:0.176cm;"| yes, all kinds
| {{Yes}}
| style="border:1pt solid #000000;padding:0.176cm;"| yes
| {{Yes}}
| style="border:1pt solid #000000;padding:0.176cm;"| yes, partially
| {{No}}
| {{Yes}}
|-
|-
| style="border:1pt solid #000000;padding:0.176cm;"| protected memory
| Memory mappings
| style="border:1pt solid #000000;padding:0.176cm;"| yes
| {{Yes}}, all kinds
| style="border:1pt solid #000000;padding:0.176cm;"| yes
| {{Yes}}
| style="border:1pt solid #000000;padding:0.176cm;"| yes
| {{Partial}}
| {{Yes}}
|-
|-
| style="border:1pt solid #000000;padding:0.176cm;"| pipes
| Pipes
| style="border:1pt solid #000000;padding:0.176cm;"| yes
| {{Yes}}
| style="border:1pt solid #000000;padding:0.176cm;"| yes
| {{Yes}}
| style="border:1pt solid #000000;padding:0.176cm;"| not yet
| {{No|Not yet}}
| {{Yes}}
|-
|-
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| terminals
| Terminals
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes
| {{Yes}}, but only Unix98 PTYs
| {{Yes}}
only Unix98 PTYs
| {{Yes}}
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes
| {{Yes}}
|-
|-
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| non-posix files (inotify, signalfd, eventfd, etc)
| Non-POSIX files (inotify, signalfd, eventfd, etc)
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes
| {{Yes}}, inotify, fanotify, epoll, signalfd, eventfd
| {{Yes}}, epoll, eventfd, signalfd are already supported and inotify will be supported in future
inotify, epoll, etc.
| {{No|Looks like no}}
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| Yes
| {{Yes}}
epoll, eventfd, signalfd are already supported and
inotify will be supported in future
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| looks like no
|-
|-
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| timers
| Timers
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes
| {{Yes}}
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| no
| {{No}}. Any counter or timer active since the beginning of a process will consider the restarted process to be a new process.
| {{Yes}}
Any counter or timer active since the beginning of a process will consider the restarted process to be a new process.
| {{Yes}}
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes
|-
|-
| Shared resources (files, mm, etc.)
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes
| {{Yes}}. SysVIPC, files, fd table and memory
| {{Yes}}. System V shared memory(shmget, etc.), mmap-based shared memory, shared sockets, pipes, file descriptors
files, memory, etc.
| {{No}}, but it is planned to support shared mmap regions
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes
| {{Yes}}
System V shared memory(shmget, etc.), mmap-based shared memory, shared sockets, pipes, file descriptors.
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| no
but it is planned to suppord shared mmap regions
|-
|-
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| block devices
| Block devices
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| looks like yes
| {{No}}
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| looks like yes
| {{Yes|Looks like yes}}
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| no
| {{No}}
| {{No}}
|-
|-
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| character devices
| Character devices
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| mostly no
| {{Yes}}, only /dev/null, /dev/zero, etc. are supported
| {{Yes}}, looks like null and zero are supported
| {{Yes}}, /dev/null and /dev/zero
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| mostly no
| {{Yes}}
looks like null and zero are supported
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| mostly no
/dev/zero are supported
|-
|-
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| capture the contents of all open files
| Capture the contents of open files
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| yes
| {{Yes}}, if file is unlinked
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| looks like no
| {{No|Looks like no}}
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.176cm;"| not yet
| {{No|Not yet}}
| {{Yes}}
|}
|}