PARDISO: incorrect behavior in deciding whether to use in-Core or out-of-core (OOC)


Version :
Intel® MKL 10.*

Product :
Intel® Math Kernel Library

Operating System :
All supported OS’s - Microsoft Windows*, Linux* and Mac OS X

Problem Description :
When iparm[59] is set 1 and
- memory required for the task solution is less then MKL_PARDISO_OOC_MAX_CORE_SIZE
and
- RAM available in the system >= MKL_PARDISO_OOC_MAX_CORE_SIZE

PARDISO reports the following message: “=== PARDISO is running in Out-Of-Core mode, because iparam(60)=1 and there is not enough RAM for In-Core ===”.

Then PARDISO operates in out-of-core mode which is considerably slower vs. in-core mode.

The problem affects all updates of Intel® MKL 10.*.


Resolution Status :
This is a known issue and we are planning to fix this problem into the next release of Intel® MKL.

Note:
If iparm[59] is to set 1 (the in-core PARDISO is used if the total memory (in MBytes) needed for storing the matrix factors is less than the value of the environment variable MKL_PARDISO_OOC_MAX_CORE_SIZE (its default value is 2000), and OOC PARDISO is used otherwise)

Note:
the problem has been fixed and the fix available in Intel® MKL versions since 10.2.Update 5 and in version 10.3.

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