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Dinesh_S_
Beginner
59 Views

Pardiso pointer (pt) type

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Hi,

 I am using pardiso solver in c++ under visual studio 2012 (x64). What should be the proper type of pt (int or long int). I cam currently using it as void *. Also I am linking with interface layer  lp64. Should I be using ilp64?

When I used it as long int, my run would crash in Release mode, but not in debug mode. However it seems to run fine if I use void *

Thanks

Dinesh

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Zhen_Z_Intel
Employee
59 Views

The datatype of pt is actually not about lp64 or ilp64, it only about program on which platform. If your program is build with x86, the void* is 4 bytes, if your problem is build with x64 platform, the void* is 8 bytes. According to your problem, void* would be the best solution. If you insist to use integer datatype to define pt, please write your code like below in windows:

#if defined (_WIN64)
#define INTEGER long long int
#elif defined (_WIN32)
#define INTEGER int
#endif
....
INTEGER pt[64];
....

If your program is for 64bit integer which means all integer data are saved and calculated as 64bits, then you could use MKL_INT and call 64bits interface pardiso_64 and link with ilp64, otherwise, please use lp64 library.

Best regards,
Fiona

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Gennady_F_Intel
Moderator
59 Views

   /* 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 */
 

Zhen_Z_Intel
Employee
59 Views

In x86 platform, the size of void* 4 bytes, but in x64 platform is 8 bytes. In windows, for x86, int is same as long(4 bytes); for x64 platform/ 64bits integer(ilp64), please use long long int(8 bytes). But in Linux, long is 8 bytes in x64.

I recommend to use MKL_INT, it's 4 bytes for x86/x64 with lp64; and 8 bytes for x86/x64 with ilp64. 

Dinesh_S_
Beginner
59 Views

Thanks for the reply.

Just to confirm, do you recommend, on Windows x64, link against ilp64 (not lp64), and use MKL_INT as data type for the internal data array (pt) ?

 

Zhen_Z_Intel
Employee
60 Views

The datatype of pt is actually not about lp64 or ilp64, it only about program on which platform. If your program is build with x86, the void* is 4 bytes, if your problem is build with x64 platform, the void* is 8 bytes. According to your problem, void* would be the best solution. If you insist to use integer datatype to define pt, please write your code like below in windows:

#if defined (_WIN64)
#define INTEGER long long int
#elif defined (_WIN32)
#define INTEGER int
#endif
....
INTEGER pt[64];
....

If your program is for 64bit integer which means all integer data are saved and calculated as 64bits, then you could use MKL_INT and call 64bits interface pardiso_64 and link with ilp64, otherwise, please use lp64 library.

Best regards,
Fiona

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