Á¤º¸°úÇÐȸ³í¹®Áö (Journal of KIISE)
Current Result Document :
ÇѱÛÁ¦¸ñ(Korean Title) |
µ¿Àû µð·ºÅ͸® Å×À̺í : °øÀ¯ ij½Ã ºí·ÏÀÇ µð·ºÅ͸® ¿£Æ®¸® µ¿Àû ÇÒ´ç |
¿µ¹®Á¦¸ñ(English Title) |
Dynamic Directory Table: On-Demand Allocation of Directory Entries for Active Shared Cache Blocks |
ÀúÀÚ(Author) |
¹èÇÑÁØ
ÃÖ¸°
Han Jun Bae
Lynn Choi
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¿ø¹®¼ö·Ïó(Citation) |
VOL 44 NO. 12 PP. 1245 ~ 1251 (2017. 12) |
Çѱ۳»¿ë (Korean Abstract) |
µð·ºÅ͸® ±â¹ÝÀÇ Ä³½Ã ÀÏ°ü¼º À¯Áö ÇÁ·ÎÅäÄÝÀ» »ç¿ëÇÏ´Â ¸ÖƼ ÄÚ¾î ½Ã½ºÅÛÀº ¼º´É Çâ»óÀ» À§ÇØ ´õ ¸¹Àº Äھ ÁýÀûÇÏ·Á ÇÏÁö¸¸ ij½Ã ÀÏ°ü¼º À¯Áö¸¦ À§ÇÑ ¿À¹öÇìµå°¡ Ä¿Á® ÄÚ¾î ¼ö¸¦ ´Ã¸®´Â µ¥¿¡ Á¦ÇÑÀÌ »ý±ä´Ù. ±âÁ¸ÀÇ ¿¬±¸µéÀº ÁÖ·Î µð·ºÅ͸® ¿£Æ®¸®ÀÇ Å©±â¸¦ ÁÙÀÌ´Â µ¥¿¡ ÁýÁßÇÏ°í ÀÖ´Ù. ÀÌ ³í¹®¿¡¼´Â ij½Ã ºí·ÏÀÌ µÎ °³ ÀÌ»óÀÇ Äھ ÀÇÇØ °øÀ¯µÉ ¶§¿¡ µð·ºÅ͸® ¿£Æ®¸®¸¦ µ¿ÀûÀ¸·Î ÇÒ´çÇÏ´Â µð·ºÅ͸® ±¸Á¶¸¦ Á¦¾ÈÇÑ´Ù. ÀÌ¿¡ µû¶ó ÇϳªÀÇ Äھ ÀÇÇؼ¸¸ Á¢±ÙµÇ´Â ºí·Ïµé¿¡ ´ëÇØ µð·ºÅ͸® Á¤º¸¸¦ °ü¸®ÇÏÁö ¾ÊÀ½À¸·Î½á µð·ºÅ͸® ¿£Æ®¸®ÀÇ ¼ö¸¦ ÁÙÀÏ ¼ö ÀÖ´Ù. ¿ì¸®´Â PARSEC º¥Ä¡¸¶Å©¿¡¼ÀÇ ½Ã¹Ä·¹À̼ÇÀ» ÅëÇØ Ç®¸Ê¿¡ ºñÇØ ÈξÀ ÀûÀº ¼öÀÇ µð·ºÅ͸® ¿£Æ®¸®¿¡¼ ³ôÀº DDT hit rateÀ» °¡Á® shared cacheÀÇ µð·ºÅ͸® Á¤º¸¸¦ ÃæºÐÈ÷ °ü¸®ÇÒ ¼ö ÀÖÀ½À» È®ÀÎÇÔ°ú µ¿½Ã¿¡ Ç®¸Ê°ú ºñ½ÁÇÑ ¼º´ÉÀ¸·Î µð·ºÅ͸®ÀÇ Å©±â¸¦ Ç®¸Ê ´ëºñ 17.84%±îÁö ÁÙÀÏ ¼ö ÀÖÀ½À» È®ÀÎÇß´Ù. |
¿µ¹®³»¿ë (English Abstract) |
In this study we present a novel directory architecture that can dynamically allocate a directory entry for a cache block on demand at runtime only when the block is shared by more than one core. Thus, we do not maintain coherence for private blocks, substantially reducing the number of directory entries. Even for shared blocks, we allocate directory entry dynamically only when the block is actively shared, further reducing the number of directory entries at runtime. For this, we propose a new directory architecture called dynamic directory table (DDT), which is implemented as a cache of active directory entries. Through our detailed simulation on PARSEC benchmarks, we show that DDT can outperform the expensive full-map directory by a slight margin with only 17.84% of directory area across a variety of different workloads. This is achieved by its faster access and high hit rates in the small directory. In addition, we demonstrate that even smaller DDTs can give comparable or higher performance compared to recent directory optimization schemes such as SPACE and DGD with considerably less area. |
Å°¿öµå(Keyword) |
ij½Ã ÀÏ°ü¼º
µð·ºÅ͸®
½Ã¹Ä·¹À̼Ç
¸ÖƼÄÚ¾î ±¸Á¶
È®Àå °¡´ÉÇÑ ÄÄÇ»ÆÃ
º´·Ä ÇÁ·Î¼¼½Ì
cache coherence
directory
simulation
multicore architecture
scalable computing
parallel processing
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