Re: [OMPI devel] subcommunicator OpenMPI issues on K

> > As other people said, Fujitsu MPI used in K is based on old > > Open MPI (v1.6.3 with bug fixes). > > I guess the obvious question is will the vanilla Open-MPI work on K? Unfortunately no. Support of Tofu and Fujitsu resource manager are not included in Open MPI. Takahiro Kawashima, MPI

Re: [OMPI devel] subcommunicator OpenMPI issues on K

Samuel, I am a developer of Fujitsu MPI. Thanks for using the K computer. For official support, please consult with the helpdesk of K, as Gilles said. The helpdesk may have information based on past inquiries. If not, the inquiry will be forwarded to our team. As other people said, Fujitsu MPI

Re: [OMPI devel] [2.1.2rc2] CMA build failure on Linux/SPARC64

ebian/Sid system w/ glibc-2.24. > > The patch you pointed me at does appear to fix the problem! > I will note this in your PRs. > > -Paul > > On Mon, Aug 21, 2017 at 9:17 PM, Kawashima, Takahiro < > t-kawash...@jp.fujitsu.com> wrote: > > > Paul, > > > &g

Re: [OMPI devel] [2.1.2rc2] CMA build failure on Linux/SPARC64

Paul, Did you upgrade glibc or something? I suspect newer glibc supports process_vm_readv and process_vm_writev and output of configure script changed. My Linux/SPARC64 with old glibc can compile Open MPI 2.1.2rc2 (CMA is disabled). To fix this, we need to cherry-pick d984b4b. Could you test the

Re: [OMPI devel] [3.0.0rc1] ppc64/gcc-4.8.3 check failure (regression).

It might be related to https://github.com/open-mpi/ompi/issues/3697 . I added a comment to the issue. Takahiro Kawashima, Fujitsu > On a PPC64LE w/ gcc-7.1.0 I see opal_fifo hang instead of failing. > > -Paul > > On Mon, Jul 3, 2017 at 4:39 PM, Paul Hargrove wrote: > > >

Re: [OMPI devel] bug in MPI_Comm_accept?

ing now, nor in > 2.0.x. I've checked the master, and it also does not work there. Is > there any time line for this? > > Thanks a lot! > > Marcin > > > > On 04/04/2017 11:03 AM, Kawashima, Takahiro wrote: > > Hi, > > > > I encountered a simi

Re: [OMPI devel] bug in MPI_Comm_accept?

Hi, I encountered a similar problem using MPI_COMM_SPAWN last month. Your problem my be same. The problem was fixed by commit 0951a34 in Open MPI master and backported to v2.1.x v2.0.x but not backported to v1.8.x and v1.10.x. https://github.com/open-mpi/ompi/commit/0951a34 Please try the

Re: [OMPI devel] MCA Component Development: Function Pointers

Hi, I created a pull request to add the persistent collective communication request feature to Open MPI. Though it's incomplete and will not be merged into Open MPI soon, you can play your collective algorithms based on my work. https://github.com/open-mpi/ompi/pull/2758 Takahiro Kawashima,

Re: [OMPI devel] Open MPI 2.0.0: Fortran with NAG compiler (nagfor)

Gilles, Jeff, In Open MPI 1.6 days, MPI_ARGVS_NULL and MPI_STATUSES_IGNORE were defined as double precision and MPI_Comm_spawn_multiple and MPI_Waitall etc. interfaces had two subroutines each. https://github.com/open-mpi/ompi-release/blob/v1.6/ompi/include/mpif-common.h#L148

Re: [OMPI devel] Class information in OpenMPI

ram” for OpenMPI code base that shows > existing classes and dependencies/associations. Are there any available tools > to extract and visualize this information. Thanks, KAWASHIMA Takahiro

Re: [OMPI devel] Missing support for 2 types in MPI_Sizeof()

> I just checked MPICH 3.2, and they *do* include MPI_SIZEOF interfaces for > CHARACTER and LOGICAL, but they are missing many of the other MPI_SIZEOF > interfaces that we have in OMPI. Meaning: OMPI and MPICH already diverge > wildly on MPI_SIZEOF. :-\ And OMPI 1.6 also had MPI_SIZEOF

Re: [OMPI devel] Fwd: [OMPI users] shared memory under fortran, bug?

ble check about using PID. if a broadcast is needed, i would > rather use the process name of rank 0 in order to avoid a broadcast. > > Cheers, > > Gilles > > On 2/3/2016 8:40 AM, Kawashima, Takahiro wrote: > > Nathan, > > > > Is is sufficient? > > Mul

Re: [OMPI devel] Fwd: [OMPI users] shared memory under fortran, bug?

Nathan, Is is sufficient? Multiple windows can be created on a communicator. So I think PID + CID is not sufficient. Possible fixes: - The root process creates a filename with a random number and broadcast it in the communicator. - Use per-communicator counter and use it in the filename.

Re: [OMPI devel] Please test: v1.10.1rc3

`configure && make && make install && make check` and running some sample MPI programs succeeded with 1.10.1rc3 on my SPARC-V9/Linux/GCC machine (Fujitsu PRIMEHPC FX10). No @SET_MAKE@ appears in any Makefiles, of course. > > For the first time I was also able to (attempt to) test SPARC64 via

Re: [OMPI devel] RFC: Remove --without-hwloc configure option

Brice, I'm a developer of Fujitsu MPI for K computer and Fujitsu PRIMEHPC FX10/FX100 (SPARC-based CPU). Though I'm not familiar with the hwloc code and didn't know the issue reported by Gilles, I also would be able to help you to fix the issue. Takahiro Kawashima, MPI development team, Fujitsu

Re: [OMPI devel] OpenMPI 1.8 Bug Report

Oh, I also noticed it yesterday and was about to report it. And one more, the base parameter of MPI_Win_detach. Regards, Takahiro Kawashima > Dear OpenMPI developers, > > I noticed a bug in the definition of the 3 MPI-3 RMA functions > MPI_Compare_and_swap, MPI_Fetch_and_op and

Re: [OMPI devel] v1.10.0rc1 available for testing

Hi folks, `configure && make && make install && make test` and running some sample MPI programs succeeded with 1.10.0rc1 on my SPARC-V9/Linux/GCC machine (Fujitsu PRIMEHPC FX10). Takahiro Kawashima, MPI development team, Fujitsu > Hi folks > > Now that 1.8.7 is out the door, we need to switch

Re: [OMPI devel] RFC: standardize verbosity values

formation that may be useful for users and developers. Not so verbose. Output only on initialization or object creation etc. DEBUG: Information that is useful only for developers. Not so verbose. Output once per MPI routine call. TRACE: Information that is useful only for developers. V

Re: [OMPI devel] c_accumulate

e epochs. > > > and the test case calls MPI_Win_fence with MPI_MODE_NOPRECEDE. > > are you saying Open MPI implementation of MPI_Win_fence should perform > a barrier in this case (e.g. MPI_MODE_NOPRECEDE) ? > > Cheers, > > Gilles > > On 4/21/2015 11:08 AM

Re: [OMPI devel] c_accumulate

manually adding a MPI_Barrier. > > Cheers, > > Gilles > > On 4/21/2015 10:20 AM, Kawashima, Takahiro wrote: > > Hi Gilles, Nathan, > > > > I read the MPI standard but I think the standard doesn't > > require a barrier in the test program. > > >

Re: [OMPI devel] c_accumulate

Hi Gilles, Nathan, I read the MPI standard but I think the standard doesn't require a barrier in the test program. >From the standards (11.5.1 Fence) : A fence call usually entails a barrier synchronization: a process completes a call to MPI_WIN_FENCE only after all other processes in

Re: [OMPI devel] Opal atomics question

Yes, Fujitsu MPI is running on sparcv9-compatible CPU. Though we currently use only stable-series (v1.6, v1.8), they work fine. Takahiro Kawashima, MPI development team, Fujitsu > Nathan, > > Fujitsu MPI is openmpi based and is running on their sparcv9 like proc. > > Cheers, > > Gilles > >

Re: [OMPI devel] Problem on MPI_Type_create_resized and multiple BTL modules

Thanks! > Takahiro, > > Sorry for the delay in answering. Thanks for the bug report and the patch. > I applied you patch, and added some tougher tests to make sure we catch > similar issues in the future. > > Thanks, > George. > > > On Mon, Sep 29, 2014 at 8

[OMPI devel] Problem on MPI_Type_create_resized and multiple BTL modules

Hi George, Thank you for attending the meeting at Kyoto. As we talked at the meeting, my colleague suffers from a datatype problem. See attached create_resized.c. It creates a datatype with an LB marker using MPI_Type_create_struct and MPI_Type_create_resized. Expected contents of the output

Re: [OMPI devel] 1.8.3rc2 available

just FYI: configure && make && make install && make test succeeded on my SPARC64/Linux/GCC (both enable-debug=yes and no). Takahiro Kawashima, MPI development team, Fujitsu > Usual place: > > http://www.open-mpi.org/software/ompi/v1.8/ > > Please beat it up as we want to release on Fri,

Re: [OMPI devel] [OMPI users] bus error with openmpi-1.8.2 and gcc-4.9.0

Hi Siegmar, Ralph, I forgot to follow the previous report, sorry. The patch I suggested is not included in Open MPI 1.8.2. The backtrace Siegmar reported points the problem that I fixed in the patch. http://www.open-mpi.org/community/lists/users/2014/08/24968.php Siegmar: Could you try my

Re: [OMPI devel] bus error with openmpi-1.8.2rc4r32485 and gcc-4.9.0

Hi Ralph, Your commit r32459 fixed the bus error by correcting opal/dss/dss_copy.c. It's OK for trunk because mca_dstore_hash calls dss to copy data. But it's insufficient for v1.8 because mca_db_hash doesn't call dss and copies data itself. The attached patch is the minimum patch to fix it in

Re: [OMPI devel] [OMPI users] bus error with openmpi-1.8.2rc4r32485 and gcc-4.9.0

Siegmar, Ralph, I'm sorry to response so late since last week. Ralph fixed the problem in r32459 and it was merged to v1.8 in r32474. But in v1.8 an additional custom patch is needed because the db/dstore source codes are different between trunk and v1.8. I'm preparing and testing the custom

Re: [OMPI devel] [OMPI users] bus error with openmpi-1.8.2rc2 on Solaris 10 Sparc

upported by all compilers */ > > as far as i am concerned, the same issue is also in the trunk, > and if you do not hit it, it just means you are lucky :-) > > the same issue might also be in other parts of the code :-( > > Cheers, > > Gilles > > On 2014/08/08 13:4

Re: [OMPI devel] [OMPI users] bus error with openmpi-1.8.2rc2 on Solaris 10 Sparc

; as a workaround, you can declare an opal_process_name_t (for alignment), > and cast it to an orte_process_name_t > > i will write a patch (i will not be able to test on sparc ...) > please note this issue might be present in other places > > Cheers, > > Gilles > &

Re: [OMPI devel] [OMPI users] bus error with openmpi-1.8.2rc2 on Solaris 10 Sparc

Hi, > > >>> I have installed openmpi-1.8.2rc2 with gcc-4.9.0 on Solaris > > >>> 10 Sparc and I receive a bus error, if I run a small program. I've finally reproduced the bus error in my SPARC environment. #0 0x00db4740 (__waitpid_nocancel + 0x44)

Re: [OMPI devel] RFC: add atomic compare-and-swap that returns old value

George, I compiled trunk with your patch for SPARCV9/Linux/GCC. I see following warning/errors. In file included from opal/include/opal/sys/atomic.h:175, from opal/asm/asm.c:21:

Re: [OMPI devel] MPI_T SEGV on DSO

with_wrapper_cxxflags=-g with_wrapper_fflags=-g with_wrapper_fcflags=-g Regards, KAWASHIMA Takahiro > The problem is the code in question does not check the return code of > MPI_T_cvar_handle_alloc . We are returning an error and they still try > to use the handle (which is stale).

[OMPI devel] MPI_T SEGV on DSO

nel, and abnormal values are printed if not yet. So this SEGV doesn't occur if I configure Open MPI with --disable-dlopen option. I think it's the reason why Nathan doesn't see this error. Regards, KAWASHIMA Takahiro

[OMPI devel] [patch] man and FUNC_NAME corrections

Hi, The attached patch corrects trivial typos in man files and FUNC_NAME variables in ompi/mpi/c/*.c files. One note which may not be trivial: Before MPI-2.1, MPI standard says MPI_PACKED should be used for MPI_{Pack,Unpack}_external. But in MPI-2.1, it was changed to use MPI_BYTE. See 'B.3

[OMPI devel] [patch] async-signal-safe signal handler

Hi, Open MPI's signal handler (show_stackframe function defined in opal/util/stacktrace.c) calls non-async-signal-safe functions and it causes a problem. See attached mpisigabrt.c. Passing corrupted memory to realloc(3) will cause SIGABRT and show_stackframe function will be invoked. But invoked

Re: [OMPI devel] 1.6.5 large matrix test doesn't pass (decode) ?

It is a bug in the test program, test/datatype/ddt_raw.c, and it was fixed at r24328 in trunk. https://svn.open-mpi.org/trac/ompi/changeset/24328 I've confirmed the failure occurs with plain v1.6.5 and it doesn't occur with patched v1.6.5. Thanks, KAWASHIMA Takahiro > Not s

Re: [OMPI devel] [patch] MPI_IN_PLACE for MPI_ALLTOALL(V|W)

Thanks! Takahiro Kawashima, MPI development team, Fujitsu > Pushed in r29187. > > George. > > > On Sep 17, 2013, at 12:03 , "Kawashima, Takahiro" > <t-kawash...@jp.fujitsu.com> wrote: > > > George, > > > > Copyright-added patch is

Re: [OMPI devel] [patch] MPI_IN_PLACE for MPI_ALLTOALL(V|W)

o > long before being discovered (especially the extent issue in the > MPI_ALLTOALL). Please feel free to apply your patch and add the correct > copyright at the beginning of all altered files. > > Thanks, > George. > > > > On Sep 17, 2013, at 07:

[OMPI devel] [patch] MPI_IN_PLACE for MPI_ALLTOALL(V|W)

Hi, My colleague tested MPI_IN_PLACE for MPI_ALLTOALL, MPI_ALLTOALLV, and MPI_ALLTOALLW, which was implemented two months ago in Open MPI trunk. And he found three bugs and created a patch. Found bugs are: (A) Missing MPI_IN_PLACE support in self COLL component The attached

Re: [OMPI devel] [bug] One-sided communication with a duplicated datatype

George, Thanks. I've confirmed your patch. I wrote a simple program to test your patch and no problems are found. The test program is attached to this mail. Regards, KAWASHIMA Takahiro > Takahiro, > > Please find below another patch, this time hopefully fixing all issues. The

Re: [OMPI devel] [bug] One-sided communication with a duplicated datatype

George, A improved patch is attached. Latter half is same as your patch. But again, I'm not sure this is a correct solution. It works correctly for my attached put_dup_type_3.c. Run as "mpiexec -n 1 ./put_dup_type_3". It will print seven OKs if succeeded. Regards, KAWASHIMA Takahiro

Re: [OMPI devel] [bug] One-sided communication with a duplicated datatype

No. My patch doesn't work for a more simple case, just a duplicate of MPI_INT. Datatype is too complex for me ... Regards, KAWASHIMA Takahiro > George, > > Thanks. But no, your patch does not work correctly. > > The assertion failure disappeared by your patch but the value

Re: [OMPI devel] [bug] One-sided communication with a duplicated datatype

t;total_pack_size = 0; break; case MPI_COMBINER_CONTIGUOUS: This patch in addition to your patch works correctly for my program. But I'm not sure this is a correct solution. Regards, KAWASHIMA Takahiro > Takahiro, > > Nice catch. That particular code was an over-optimiza

Re: [OMPI devel] RFC MPI 2.2 Dist_graph addition

George, My colleague was working on your ompi-topo bitbucket repository but it was not completed. But he found bugs in your patch attached in your previous mail and created the fixing patch. See the attached patch, which is a patch against Open MPI trunk + your patch. His test programs are also

Re: [OMPI devel] Datatype initialization bug?

nagement of the common desc_t into a nightmare > … with the effect you noticed few days ago. Too bad for the optimization > part. I now duplicate the desc_t between the two layers, and all OMPI > datatypes have now their own desc_t. > > Thanks for finding and analyzing so deeply this

[OMPI devel] Datatype initialization bug?

and OMPI datatypes is allowed? Regards, KAWASHIMA Takahiro

Re: [OMPI devel] [OMPI svn-full] svn:open-mpi r27880 - trunk/ompi/request

new patch. Basically I went over all > the possible cases, both in test and wait, and ensure the behavior is always > consistent. Please give it a try, and let us know of the outcome. > > Thanks, > George. > > > > On Jan 25, 2013, at 00:53 , "Kawashima, Takahi

Re: [OMPI devel] [patch] MPI-2.2: Ordering of attribution deletion callbacks on MPI_COMM_SELF

and another for bug fixes, as described in my previous mail. Regards, KAWASHIMA Takahiro > Jeff, George, > > I've implemented George's idea for ticket #3123 "MPI-2.2: Ordering of > attribution deletion callbacks on MPI_COMM_SELF". See attached > delete-attr-order.patc

Re: [OMPI devel] RFC: opal_list iteration macros

I don't care the macro names. Either one is OK for me. Thanks, KAWASHIMA Takahiro > Hmm, maybe something like: > > OPAL_LIST_FOREACH, OPAL_LISTFOREACH_REV, OPAL_LIST_FOREACH_SAFE, > OPAL_LIST_FOREACH_REV_SAFE? > > -Nathan > > On Thu, Jan 31, 2013 at 12:36:29AM +

Re: [OMPI devel] RFC: opal_list iteration macros

Hi, Agreed. But how about backward traversal in addition to forward traversal? e.g. OPAL_LIST_FOREACH_FW, OPAL_LIST_FOREACH_FW_SAFE, OPAL_LIST_FOREACH_BW, OPAL_LIST_FOREACH_BW_SAFE We sometimes search an item from the end of a list. Thanks, KAWASHIMA Takahiro > What: Add two new mac

Re: [OMPI devel] [OMPI svn-full] svn:open-mpi r27880 - trunk/ompi/request

of other bugs. > > Sent from my phone. No type good. > > On Jan 22, 2013, at 8:57 PM, "Kawashima, Takahiro" > <t-kawash...@jp.fujitsu.com> wrote: > > > George, > > > > I reported the bug three months ago. > > Your commit r27880 resolved on

Re: [OMPI devel] [patch] MPI-2.2: Ordering of attribution deletion callbacks on MPI_COMM_SELF

and other 7 latest changesets are for bug/typo-fixes. Regards, KAWASHIMA Takahiro > Jeff, > > OK. I'll try implementing George's idea and then you can compare which > one is simpler. > > Regards, > KAWASHIMA Takahiro > > > Not that I'm aware of; that would be gre

Re: [OMPI devel] [OMPI svn-full] svn:open-mpi r27880 - trunk/ompi/request

George, I reported the bug three months ago. Your commit r27880 resolved one of the bugs reported by me, in another approach. http://www.open-mpi.org/community/lists/devel/2012/10/11555.php But other bugs are still open. "(1) MPI_SOURCE of MPI_Status for a null request must be

Re: [OMPI devel] MPI-2.2 status #2223, #3127

>>> > >>> > >>> On Jan 18, 2013, at 5:47 AM, George Bosilca <bosi...@icl.utk.edu> > >>> wrote: > >>> > >>>> Takahiro, > >>>> > >>>> The MPI_Dist_graph effort is happening in > >>

Re: [OMPI devel] "Open MPI"-based MPI library used by K computer

I've confirmed. Thanks. Takahiro Kawashima, MPI development team, Fujitsu > Done -- thank you! > > On Jan 11, 2013, at 3:52 AM, "Kawashima, Takahiro" > <t-kawash...@jp.fujitsu.com> wrote: > > > Hi Open MPI core members and Rayson, > > > > I'v

[OMPI devel] MPI-2.2 status #2223, #3127

Hi, Fujitsu is interested in completing MPI-2.2 on Open MPI and Open MPI -based Fujitsu MPI. We've read wiki and tickets. These two tickets seem to be almost done but need testing and bug fixing. https://svn.open-mpi.org/trac/ompi/ticket/2223 MPI-2.2: MPI_Dist_graph_* functions missing

Re: [OMPI devel] [patch] MPI-2.2: Ordering of attribution deletion callbacks on MPI_COMM_SELF

Jeff, OK. I'll try implementing George's idea and then you can compare which one is simpler. Regards, KAWASHIMA Takahiro > Not that I'm aware of; that would be great. > > Unlike George, however, I'm not concerned about converting to linear > operations for attributes. >

Re: [OMPI devel] [patch] MPI-2.2: Ordering of attribution deletion callbacks on MPI_COMM_SELF

George, Your idea makes sense. Is anyone working on it? If not, I'll try. Regards, KAWASHIMA Takahiro > Takahiro, > > Thanks for the patch. I deplore the lost of the hash table in the attribute > management, as the potential of transforming all attributes operation to a > li

[OMPI devel] [patch] MPI-2.2: Ordering of attribution deletion callbacks on MPI_COMM_SELF

e it, take in this patch. Though I'm a employee of a company, this is my independent and private work at my home. No intellectual property from my company. If needed, I'll sign to Individual Contributor License Agreement. Regards, KAWASHIMA Takahiro delete-attr-order.patch.gz Description: Binary data

Re: [OMPI devel] "Open MPI"-based MPI library used by K computer

Hi Open MPI core members and Rayson, I've confirmed to the authors and created the bibtex reference. Could you make a page in the "Open MPI Publications" page that links to Fujitsu's PDF file? The attached file contains information of title, authors, abstract, link URL, and bibtex reference.

Re: [OMPI devel] "Open MPI"-based MPI library used by K computer

Hi, Sorry for not replying sooner. I'm taliking with the authors (they are not in this list) and will request linking the PDF soon if they allowed. Takahiro Kawashima, MPI development team, Fujitsu > Our policy so far was that adding a paper to the list of publication on the > Open MPI website

Re: [OMPI devel] [patch] SEGV on processing unexpected messages

ng this idea. > > Thanks, > george. > > > On Oct 18, 2012, at 03:06 , "Kawashima, Takahiro" > <t-kawash...@jp.fujitsu.com> wrote: > > > Hi Open MPI developers, > > > > I found another issue in Open MPI. > > > > In MCA_PML

[OMPI devel] [patch] SEGV on processing unexpected messages

Hi Open MPI developers, I found another issue in Open MPI. In MCA_PML_OB1_RECV_FRAG_INIT macro in ompi/mca/pml/ob1/pml_ob1_recvfrag.h file, we copy a PML header from an arrived message to another buffer, as follows: frag->hdr = *(mca_pml_ob1_hdr_t*)hdr; On this copy, we cast hdr to

Re: [OMPI devel] [patch] Invalid MPI_Status for null or inactive request

t; files. Basically, it doesn't matter that we leave the last returned error > code on an inactive request, as we always return MPI_STATUS_EMPTY in the > status for such requests. > > Thanks, > george. > > > On Oct 15, 2012, at 07:02 , "Kawashima, Takahiro"

Re: [OMPI devel] [patch] Invalid MPI_Status for null or inactive request

Hi Open MPI developers, > > > The bugs are: > > > > > > (1) MPI_SOURCE of MPI_Status for a null request must be MPI_ANY_SOURCE. > > > > > > (2) MPI_Status for an inactive request must be an empty status. > > > > > > (3) Possible BUS errors on sparc64 processors. > > > > > > r23554 fixed

Re: [OMPI devel] [patch] Invalid MPI_Status for null or inactive request

Hi Eugene, > > I found some bugs in Open MPI and attach a patch to fix them. > > > > The bugs are: > > > > (1) MPI_SOURCE of MPI_Status for a null request must be MPI_ANY_SOURCE. > > > > (2) MPI_Status for an inactive request must be an empty status. > > > > (3) Possible BUS errors on sparc64

[OMPI devel] [patch] Invalid MPI_Status for null or inactive request

Hi Open MPI developers, I found some bugs in Open MPI and attach a patch to fix them. The bugs are: (1) MPI_SOURCE of MPI_Status for a null request must be MPI_ANY_SOURCE. 3.7.3 Communication Completion in MPI-3.0 (and also MPI-2.2) says an MPI_Status object returned by

Re: [OMPI devel] [patch] MPI_Cancel should not cancel a request if it has a matched recv frag

_complete > + * to true. Otherwise, the request will never be freed. > + */ > +request->req_recv.req_base.req_pml_complete = true; > OPAL_THREAD_UNLOCK(>matching_lock); > > OPAL_THREAD_LOCK(_request_lock); > @@ -138,7 +129,7 @@ > MCA_PML_OB1_RECV_REQUEST_MPI

[OMPI devel] [patch] MPI_Cancel should not cancel a request if it has a matched recv frag

Hi Open MPI developers, I found a small bug in Open MPI. See attached program cancelled.c. In this program, rank 1 tries to cancel a MPI_Irecv and calls a MPI_Recv instead if the cancellation succeeds. This program should terminate whether the cancellation succeeds or not. But it leads a