topic >>...ippsmalloc is making a in Intel® Integrated Performance Primitives

ipps malloc

Adlai_S_ — Wed, 03 Oct 2012 18:51:16 GMT

I am working on a real-time system, and it appears that ippsmalloc is making a system call which causes a time consuming mode switch. Are the standard malloc/free called by ippsmalloc/ippsfree?

If so, is it ok to pre-allocate aligned memory (instead of dynamically allocating memory) and use the pre-allocated memory with ipp functions?

Is there an ipp function that will pre-allocate aligned memory?

Thanks!

yes, the standard malloc

Gennady_F_Intel — Thu, 04 Oct 2012 03:18:54 GMT

yes, the standard malloc /free is called by ipp?malloc/ipp?free there are no ipp function that will pre-allocate aligned memory.

Thank you for the quick

Adlai_S_ — Thu, 04 Oct 2012 17:16:57 GMT

Thank you for the quick response Gennady!

>>...ippsmalloc is making a

SergeyKostrov — Tue, 16 Oct 2012 14:17:19 GMT

>>...ippsmalloc is making a system call which causes a time consuming mode switch... I would recommend to pre-allocate all needed memory before switching to a real-time processing ( if it's possible ). I've done some tests a couple of months ago and when large amounts of memory are allocated in the real-time on a Windows platform the performance of Virtual Memory manager goes down significantly. Regarding aligned memory: if you're using a Desktop Windows platform ( XP, Vista, 7, etc ) try to use 'aligned_malloc' and 'aligned_free' CRT-functions. However, they are Not supported on Windows CE and Mobile platforms.

>>...ippsmalloc is making a

SergeyKostrov — Tue, 16 Oct 2012 14:18:34 GMT

>>...ippsmalloc is making a system call which causes a time consuming mode switch... Could you provide more technical details? How did you detect it?