PCM for main memory Challenges with PCM Major disadvantage -Writes Compared to read operation PCm writes incur higher energy consumption higher latency and limited endurance Read latency 20 50ns Write latency lus Read energy 1 J/GB Write energy 6J/GB Endurance 1056~108 Reducing PCM writes is an important goal of data management on PCM!PCM for main memory Challenges with PCM • Major disadvantage – Writes Compared to read operation ,PCM writes incur higher energy consumption、 higher latency and limited endurance Read latency 20~50ns Write latency ~1us Read energy 1 J/GB Write energy 6 J/GB Endurance 106~108 Reducing PCM writes is an important goal of data management on PCM !