Using Intel’s Single-Chip Cloud Computer (SCC) - Intel, Mattson, Tutorial
Using Intel’s Single-Chip Cloud Computer (SCC) - Intel, Mattson, Tutorial
Using Intel’s Single-Chip Cloud Computer (SCC) - Intel, Mattson, Tutorial
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36<br />
How to use the shared DRAM<br />
• Two devices for shared memory DRAM<br />
– /dev/rckncm – Linux device exposing “non-cacheable memory”.<br />
– /dev/rckdcm – Linux device exposing “definitely cacheable memory”.<br />
• Access to shared memory through RCCE<br />
– The appropriate device is opened inside RCCE_init()<br />
– SHMalloc() in <strong>SCC</strong>_API.c does the actual mmap() routine to get the<br />
file descriptor of the opened device.<br />
– Set all this up by building RCCE with SHMADD_CACHEABLE<br />
• If you work with Cacheable shared memory, you need to<br />
manage cache coherence explicitly.<br />
– In other words … you need to understand when the cache needs to<br />
be flushed and explicitly insert flushes as needed.
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