pardiso memory release problem

dshor1 — Mon, 24 Oct 2005 00:37:11 GMT

this is the pardiso_sym.c example from MKL

I just added

_ASSERT ( _CrtCheckMemory());

at the very end

and the

#include

at top

there seems to be some writing to blocks after releaseing them with

phase = -1, it's ok if phase is 0 (partial release)

my full program with release runtime lib will crash after a while, I'm just not using phase = -1 at the moment.

and idea ?

I'm using MSVC NET 2003 and MKL beta 8, linking with mkl_c.lib and mkl_solver.lib and Single-threaded Debug (/MLd) runtime lib

thank's

Code:

/*
********************************************************************************
*                              INTEL CONFIDENTIAL
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*   The source code contained  or  described herein and all documents related to
*   the source code ("Material") are owned by Intel Corporation or its suppliers
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*   Material  is  protected  by  worldwide  copyright  and trade secret laws and
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*   otherwise.  Any  license  under  such  intellectual property  rights must be
*   express and approved by Intel in writing.
*
********************************************************************************
*   Content : MKL DSS C example
*
********************************************************************************
*/
/* -------------------------------------------------------------------- */
/* Example program to show the use of the "PARDISO" routine */
/* on symmetric linear systems */
/* -------------------------------------------------------------------- */
/* This program can be downloaded from the following site: */
/* http://www.computational.unibas.ch/cs/scicomp */
/* */
/* (C) Olaf Schenk, Department of Computer Science, */
/* University of Basel, Switzerland. */
/* Email: olaf.schenk@unibas.ch */
/* -------------------------------------------------------------------- */
#include "stdafx.h"
#include 
#include 
#include 
#include 
extern int omp_get_max_threads();
/* PARDISO prototype. */
#if defined(_WIN32) || defined(_WIN64)
#define pardiso_ PARDISO
#else
#define PARDISO pardiso_
#endif
extern "C" int PARDISO
	(void *, int *, int *, int *, int *, int *,
	double *, int *, int *, int *, int *, int *,
	int *, double *, double *, int *);

int main( void ) {
	/* Matrix data. */
	int n = 8;
	int ia[ 9] = { 1, 5,
 8, 10, 12, 15, 17, 18, 19 };
	int ja[18] = { 1, 3, 6, 7,
		2, 3, 5,
		3, 8,
		4, 7,
		5, 6, 7,
		6, 8,
		7,
		8 };
	double a[18] = { 7.0, 1.0, 2.0, 7.0,
		-4.0, 8.0, 2.0,
		1.0, 5.0,
		7.0, 9.0,
		5.0, 1.0, 5.0,
		-1.0, 5.0,
		11.0,
		5.0 };
	int mtype = -2; /* Real symmetric matrix */
	/* RHS and solution vectors. */
	double b[8], x[8];
	int nrhs = 1; /* Number of right hand sides. */
	/* Internal solver memory pointer pt, */
	/* 32-bit: int pt[64]; 64-bit: long int pt[64] */
	/* or void *pt[64] should be OK on both architectures */
	void *pt[64];
	/* Pardiso control parameters. */
	int iparm[64];
	int maxfct, mnum, phase, error, msglvl;
	/* Auxiliary variables. */
	int i;
	double ddum; /* Double dummy */
	int idum; /* Integer dummy. */
/* -------------------------------------------------------------------- */
/* .. Setup Pardiso control parameters. */
/* -------------------------------------------------------------------- */
	for (i = 0; i < 64; i++) {
		iparm = 0;
	}
	iparm[0] = 1; /* No solver default */
	iparm[1] = 2; /* Fill-in reordering from METIS */
	/* Numbers of processors, value of OMP_NUM_THREADS */
	iparm[2] = 2;//omp_get_max_threads();
	iparm[3] = 0; /* No iterative-direct algorithm */
	iparm[4] = 0; /* No user fill-in reducing permutation */
	iparm[5] = 0; /* Write solution into x */
	iparm[6] = 0; /* Not in use */
	iparm[7] = 2; /* Max numbers of iterative refinement steps */
	iparm[8] = 0; /* Not in use */
	iparm[9] = 13; /* Perturb the pivot elements with 1E-13 */
	iparm[10] = 1; /* Use nonsymmetric permutation and scaling MPS */
	iparm[11] = 0; /* Not in use */
	iparm[12] = 0; /* Not in use */
	iparm[13] = 0; /* Output: Number of perturbed pivots */
	iparm[14] = 0; /* Not in use */
	iparm[15] = 0; /* Not in use */
	iparm[16] = 0; /* Not in use */
	iparm[17] = -1; /* Output: Number of nonzeros in the factor LU */
	iparm[18] = -1; /* Output: Mflops for LU factorization */
	iparm[19] = 0; /* Output: Numbers of CG Iterations */
	maxfct = 1; /* Maximum number of numerical factorizations. */
	mnum = 1; /* Which factorization to use. */
	msglvl = 1; /* Print statistical information in file */
	error = 0; /* Initialize error flag */
/* -------------------------------------------------------------------- */
/* .. Initialize the internal solver memory pointer. This is only */
/* necessary for the FIRST call of the PARDISO solver. */
/* -------------------------------------------------------------------- */
	for (i = 0; i < 64; i++) {
		pt = 0;
	}
/* -------------------------------------------------------------------- */
/* .. Reordering and Symbolic Factorization. This step also allocates */
/* all memory that is necessary for the factorization. */
/* -------------------------------------------------------------------- */
	phase = 11;
	PARDISO (pt, &maxfct, &mnum, &mtype, &phase,
		&n, a, ia, ja, &idum, &nrhs,
		iparm, &msglvl, &ddum, &ddum, &error);
	if (error != 0) {
		printf("
ERROR during symbolic factorization: %d", error);
		exit(1);
	}
	printf("
Reordering completed ... ");
	printf("
Number of nonzeros in factors = %d", iparm[17]);
	printf("
Number of factorization MFLOPS = %d", iparm[18]);
/* -------------------------------------------------------------------- */
/* .. Numerical factorization. */
/* -------------------------------------------------------------------- */
	phase = 22;
	PARDISO (pt, &maxfct, &mnum, &mtype, 
&phase,
		&n, a, ia, ja, &idum, &nrhs,
		iparm, &msglvl, &ddum, &ddum, &error);
	if (error != 0) {
		printf("
ERROR during numerical factorization: %d", error);
		exit(2);
	}
	printf("
Factorization completed ... ");
/* -------------------------------------------------------------------- */
/* .. Back substitution and iterative refinement. */
/* -------------------------------------------------------------------- */
	phase = 33;
	iparm[7] = 2; /* Max numbers of iterative refinement steps. */
	/* Set right hand side to one. */
	for (i = 0; i < n; i++) {
		b = 1;
	}
	PARDISO (pt, &maxfct, &mnum, &mtype, &phase,
		&n, a, ia, ja, &idum, &nrhs,
		iparm, &msglvl, b, x, &error);
	if (error != 0) {
		printf("
ERROR during solution: %d", error);
		exit(3);
	}
	printf("
Solve completed ... ");
	printf("
The solution of the system is: ");
	for (i = 0; i < n; i++) {
		printf("
 x [%d] = % f", i, x );
	}
	printf ("
");
/* -------------------------------------------------------------------- */
/* .. Termination and release of memory. */
/* -------------------------------------------------------------------- */
	phase = -1; /* Release internal memory. */
	PARDISO (pt, &maxfct, &mnum, &mtype, &phase,
		&n, &ddum, ia, ja, &idum, &nrhs,
		iparm, &msglvl, &ddum, &ddum, &error);

	_ASSERT ( _CrtCheckMemory());

	return 0;
}

Re: pardiso memory release problem

michael_chuvelev — Wed, 09 Nov 2005 18:59:43 GMT

Hello,

I'm an engineer working for MKL. I've reproduced the issue with MKL 8.0 beta. The program compiled in the debug mode stops under debugger inside _heapchk system module, while running well with no debugger. Is it the same in your environment?

The samehas beenobserved with MKL 8.0 Gold, but MKL 8.0.1 coming soon will not contain this bug.

Regards.

Re: pardiso memory release problem

dshor1 — Mon, 14 Nov 2005 00:16:27 GMT

Thanks,

good to know it will be fixed.

running well with no debugger, isn't a good thing, it's just mean nasty unpredictable bug may appear sometimes....

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