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<p class="MsoNormal"><span style="font-size:10.0pt;color:black">Hi Min,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:black">I found the following piece of code in MPICH source : src/pm/util/pmiserv.c :<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> /* We include the pid of the PMI server as a way to allow multiple<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> PMI servers to coexist. This is needed to support connect/accept<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> operations when multiple mpiexec's are used, and the KVS space<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> is served directly by mpiexec
</span><b><span style="font-size:10.0pt;font-family:"Courier New";color:red">(it should really have the
<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Courier New";color:red"> hostname as well, just to avoid getting the same pid on two<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Courier New";color:red"> different hosts, but this is probably good enough for most<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Courier New";color:red"> uses)</span></b><span style="font-size:10.0pt;font-family:"Courier New";color:black"> */<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> MPIU_Snprintf( (char *)(kvs->kvsname), MAXNAMELEN, "kvs_%d_%d",
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> (int)getpid(), kvsnum++ );<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> kvs->pairs = 0;
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> kvs->lastByIdx = 0;
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> kvs->lastIdx = -1;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:black"><o:p> </o:p></span></p>
<div style="mso-element:para-border-div;border:none;border-bottom:double windowtext 2.25pt;padding:0in 0in 1.0pt 0in">
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;color:black">and in src/pm/hydra/pm/pmiserv/common.c<o:p></o:p></span></p>
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;font-family:"Courier New";color:black">HYD_status HYD_pmcd_pmi_allocate_kvs(struct HYD_pmcd_pmi_kvs ** kvs, int pgid)<o:p></o:p></span></p>
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;font-family:"Courier New";color:black">{<o:p></o:p></span></p>
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> HYD_status status = HYD_SUCCESS;<o:p></o:p></span></p>
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> HYDU_FUNC_ENTER();<o:p></o:p></span></p>
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> HYDU_MALLOC(*kvs, struct HYD_pmcd_pmi_kvs *, sizeof(struct HYD_pmcd_pmi_kvs), status);<o:p></o:p></span></p>
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> HYDU_snprintf((*kvs)->kvsname, PMI_MAXKVSLEN, "kvs_%d_%d", (int) getpid(), pgid);<o:p></o:p></span></p>
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> (*kvs)->key_pair = NULL;<o:p></o:p></span></p>
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> fn_exit:<o:p></o:p></span></p>
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> HYDU_FUNC_EXIT();<o:p></o:p></span></p>
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> return status;<o:p></o:p></span></p>
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> fn_fail:<o:p></o:p></span></p>
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> goto fn_exit;<o:p></o:p></span></p>
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;font-family:"Courier New";color:black">}<o:p></o:p></span></p>
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;color:black">I think hostname should be added to kvsname to make it unique when accept/connect are being done from multiple processes which are not invoked by the same mpiexec.<o:p></o:p></span></p>
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;color:black">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;color:black">Hirak<o:p></o:p></span></p>
<p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:10.0pt;color:black"><o:p> </o:p></span></p>
</div>
<p class="MsoNormal"><span style="font-size:10.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">Hi Hirak,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">Before look into PMI, it would be good to first make sure if this is a
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">problem in your server-client code, or in the dynamic process part of
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">MPICH code. Could you please reproduce this issue with a simple program
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">and give it to us ?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">One thing I noticed is that the server program is multithreaded. Are you
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">using multiple threads to accept client connection ? Anyway, a
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">reproducer program will be great.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">Please also try to use the latest MPICH release and see if it happens.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">In summary, it would be great if you can send us the following files.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">- A reproducer program<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">- MPICH's config.log (you can find it in the directory where you build
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">MPICH)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">Min<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">On 4/14/17 1:15 AM, Roy, Hirak wrote:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i><o:p> </o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i><o:p> </o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> Dear MPICH team,<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i><o:p> </o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> We use MPICH for a server-client application. We use MPICH-3.0.4 with
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> sock channel.<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> In this application there is one server and 100 clients.<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> Each client is launched independently in different host-machines using
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> individual-wrapper scripts. (we explicitly use : mpiexec -n 1 )<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i><o:p> </o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> The server is multithreaded and it uses MPI_Comm_accept (on
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> MPI_COMM_SELF) and clients use MPI_Comm_connect to connect.<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> We have observed the following issue after all the clients connect to
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> server :<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> if we send message to a client (lets say 'm'), it reaches
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> unexpectedly to some other client (lets say 'n'). { server sends the
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> message using the communicator returned by accept call }. This happens
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> randomly in one out of 5-6 runs.<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i><o:p> </o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> On further looking into MPICH code, we found that<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> 1) There is a collsion of pg (process-group) of two processes (m and
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> n) after mpi-comm-accept<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> 2) As a result of (1), comm->vc are same (for m and n, although comm
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> are different). It seems that the unique string (something like
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> kva_<int>_int) is not unique for such two processes. 'm' and 'n'
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> processes are running in different host-machine and they have the same
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> pid. The kva string looked like kva_pid_rank.<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i><o:p> </o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i><o:p> </o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> We have the following questions :<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> 1) Have we built MPICH with some kind of incorrect
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> configuration (hydra configuration at the end of the email) ?<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> 2) Are we using incorrect process-manager or configuration and that is
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> why there is a possible collision of process-groups?<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> 3) What is the purpose of process group sharing/uniquifying? If there
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> is no real reason for this, could it be disabled or will something
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> else rely on the id string being unique?<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> 4) If there are no other work-around, what could be done to make the
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> id string unique? Add the host-name? Will everything else be ok with this?<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i><o:p> </o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i><o:p> </o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> It would be good if you can let us know if there is any workaround for
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> this issue or not.<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i><o:p> </o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i><o:p> </o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> Thanks,<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> Hirak Roy<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i><o:p> </o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> HYDRA build details:<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> CXX: no -O3 -fPIC<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> F77: no<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> F90: no<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> Configure options: '--disable-option-checking'
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> '--prefix=/home/hroy/local/mpich-3.0.4/linux_x86_64' '--disable-f77'
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> '--disable-fc' '--disable-f90modules' '--disable-cxx'
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> '--enable-fast=nochkmsg' '--enable-fast=notiming'
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> '--enable-fast=ndebug' '--enable-fast=O3' '--with-device=ch3:sock'
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> 'CFLAGS=-O3 -fPIC -O3' 'CXXFLAGS=-O3 -fPIC '
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> 'CC=/u/prod/gnu/gcc/20121129/gcc-4.5.0-linux_x86_64/bin/gcc' 'LDFLAGS=
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> ' '--cache-file=/dev/null' '--srcdir=.' 'LIBS=-lrt -lpthread '
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> 'CPPFLAGS= -I/home/hroy/tools/mpich/mpich-3.0.4/src/mpl/include
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> -I/home/hroy/tools/mpich/mpich-3.0.4/src/mpl/include
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> -I/home/hroy/tools/mpich/mpich-3.0.4/src/openpa/src
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> -I/home/hroy/tools/mpich/mpich-3.0.4/src/openpa/src
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> -I/home/hroy/tools/mpich/mpich-3.0.4/src/mpi/romio/include'<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> Process Manager: pmi<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> Launchers available: ssh rsh fork slurm ll lsf
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> sge manual persist<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> Topology libraries available: hwloc<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> Resource management kernels available: user slurm ll lsf sge pbs
<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> cobalt<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> Checkpointing libraries available:<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i> Demux engines available: poll select<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i><o:p> </o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><i><o:p> </o:p></i></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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