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I'm basically solving Poisson, and using valgrind to check memory issues. I set pctype to PCHYPRE. It works fine if I use one core. But if I use two cores, it gives me the following error messages about the memory, and then it computes results fine. It seems
that it has to do with hypre, for if I set pctype to something else such as PCGAMG or PCJACOBI, it does not output any error message at all, regardless of one core or two cores. By the way, I use DM objects for the matrix and ksp. </p>
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==59097== Syscall param writev(vector[...]) points to uninitialised byte(s)</p>
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==59097== at 0x2F19FF2: writev (in /usr/lib/system/libsystem_kernel.dylib)</p>
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==59097== by 0x2AF470D: MPIDU_Sock_writev (sock_immed.i:610)</p>
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==59097== by 0x2ADE3E5: MPIDI_CH3_iStartMsgv (ch3_istartmsgv.c:110)</p>
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==59097== by 0x2ACEEF8: MPIDI_CH3_EagerContigSend (ch3u_eager.c:182)</p>
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==59097== by 0x2AD556F: MPID_Send (mpid_send.c:143)</p>
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==59097== by 0x2920057: MPI_Send (send.c:127)</p>
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==59097== by 0x1A712B1: hypre_MPI_Send (mpistubs.c:988)</p>
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==59097== by 0x1A6E77B: hypre_DataExchangeList (exchange_data.c:392)</p>
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==59097== by 0x194D7C1: hypre_NewCommPkgCreate_core (new_commpkg.c:267)</p>
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==59097== by 0x195108B: hypre_MatvecCommPkgCreate (par_csr_communication.c:478)</p>
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==59097== by 0x192020B: hypre_BoomerAMGCreateS (par_strength.c:190)</p>
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==59097== by 0x189D6AD: hypre_BoomerAMGSetup (par_amg_setup.c:883)</p>
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==59097== by 0x187BD7A: HYPRE_BoomerAMGSetup (HYPRE_parcsr_amg.c:52)</p>
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==59097== by 0x11EFCE6: PCSetUp_HYPRE (hypre.c:157)</p>
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==59097== by 0x12766D4: PCSetUp (precon.c:918)</p>
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==59097== by 0x1385670: KSPSetUp (itfunc.c:330)</p>
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==59097== by 0x138798B: KSPSolve (itfunc.c:542)</p>
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==59097== by 0x10003C854: fourPoissonSolve (FourPoisson3D.h:383)</p>
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==59097== by 0x1000DEA42: main (test.c:473)</p>
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==59097== Address 0x100a295d8 is 8 bytes inside a block of size 28 alloc'd</p>
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==59097== at 0xC258: malloc (vg_replace_malloc.c:300)</p>
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==59097== by 0x1A6F501: hypre_MAlloc (hypre_memory.c:62)</p>
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==59097== by 0x1A6DDBA: hypre_DataExchangeList (exchange_data.c:212)</p>
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==59097== by 0x194D7C1: hypre_NewCommPkgCreate_core (new_commpkg.c:267)</p>
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==59097== by 0x195108B: hypre_MatvecCommPkgCreate (par_csr_communication.c:478)</p>
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==59097== by 0x192020B: hypre_BoomerAMGCreateS (par_strength.c:190)</p>
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==59097== by 0x189D6AD: hypre_BoomerAMGSetup (par_amg_setup.c:883)</p>
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==59097== by 0x187BD7A: HYPRE_BoomerAMGSetup (HYPRE_parcsr_amg.c:52)</p>
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==59097== by 0x11EFCE6: PCSetUp_HYPRE (hypre.c:157)</p>
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==59097== by 0x12766D4: PCSetUp (precon.c:918)</p>
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==59097== by 0x1385670: KSPSetUp (itfunc.c:330)</p>
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==59097== by 0x138798B: KSPSolve (itfunc.c:542)</p>
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==59097== by 0x10003C854: fourPoissonSolve (FourPoisson3D.h:383)</p>
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==59097== by 0x1000DEA42: main (test.c:473)</p>
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Best,</p>
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Hui</p>
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