A compiler combined with a user level runtime system can replace and outperform standard virtual memory management (VMM) for out-of-core problems. The execution time for single code and the overall impact on system resource utilization is lower for the compiler/runtime system combination than for VMM. Also this system does not require modification of the operating system kernel. In this paper we present a modified Comanche (Compiler Managed Cache) system and give new methodologies for providing efficient out-of-core programming without VMM for wavefront data access patterns. The experimental data show that Comanche performs better than VMM for the test case patterns under two standard operating systems, Windows and Linux, and has significantly less impact on system resources.