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Ȩ Ȩ > ¿¬±¸¹®Çå > ±¹³» ³í¹®Áö > Çѱ¹Á¤º¸Ã³¸®ÇÐȸ ³í¹®Áö > Á¤º¸Ã³¸®ÇÐȸ ³í¹®Áö A

Á¤º¸Ã³¸®ÇÐȸ ³í¹®Áö A

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ÇѱÛÁ¦¸ñ(Korean Title) °³Àοë SSD¸¦ À§ÇÑ ¼±¹ÝÀÔ ¹× ¸Þ¸ð¸® °ü¸® Á¤Ã¥
¿µ¹®Á¦¸ñ(English Title) A Prefetching and Memory Management Policy for Personal Solid State Drives
ÀúÀÚ(Author) ¹é½ÂÈÆ   Sung Hoon Baek  
¿ø¹®¼ö·Ïó(Citation) VOL 19-A NO. 01 PP. 0035 ~ 0044 (2012. 02)
Çѱ۳»¿ë
(Korean Abstract)
±âÁ¸ÀÇ ¿î¿µÃ¼Á¦¿¡¼­ Çϵåµð½ºÅ©ÀÇ ¼º´ÉÀ» Çâ»ó½ÃÅ°±â À§Çؼ­ »ç¿ëÇØ¿Ô´ø ±â¼úµéÀÌ SSD(Solid State Drive)¿¡´Â ºÎÁ¤Àû È¿°ú¸¦ ³ªÅ¸³»´Â °æ¿ì°¡ ¸¹´Ù. HDDÀÇ ±â°èÀûÀÎ ¿ä¼Ò ¶§¹®¿¡ Á¢±Ù ½Ã°£°ú ºí·Ï ÁÖ¼ÒÀÇ ¼ø¼­°¡ ¼º´É¿¡ ¸Å¿ì Áß¿äÇÑ ¿äÀÎÀ¸·Î ÀÛ¿ëÇÏ¿´Áö¸¸, SSD´Â ºÒ·Ï ÁÖ¼ÒÀÇ ¼ø¼­¿¡ ¿µÇâÀ» ¹ÞÁö ¾Ê´Â ¿ì¼öÇÑ ·£´ý Àб⠼º´ÉÀ» Á¦°øÇÑ´Ù. ½ÇÁ¦ °³Àοë PC¿¡¼­ SSD¸¦ »ç¿ëÇÒ ¶§¿¡ ¼±¹ÝÀÔÀ» ²ôµµ·Ï ±Ç°íµÇ°í ÀÖ´Ù. ÇÏÁö¸¸ ÀÌ ³í¹®Àº SSDÀÇ ³»ºÎ ±¸Á¶¿Í ³½µå Ç÷¡½Ã ¸Þ¸ð¸®ÀÇ Æ¯Â¡À» °í·ÁÇÑ ¼±¹ÝÀÔ ¹× ¸Þ¸ð¸®°ü¸® Á¤Ã¥¸¦ °áÇÕÇÑ ¹æ¹ýÀ» Á¦½ÃÇÑ´Ù. SSD¿¡´Â ´Ù¼ö°³ÀÇ ³½µå Ç÷¡½Ã ¸Þ¸ð¸®·Î ±¸¼ºµÇ¾î ÀÖ¾î ĨÀ» µ¿½Ã¿¡ ±¸µ¿½ÃÅ°´Â °ÍÀÌ Áß¿äÇϸç, ³½µå Ç÷¡½Ã ¸Þ¸ð¸®ÀÇ ±âº» ÀÔÃâ·Â ´ÜÀ§°¡ °è¼Ó Áõ°¡ÇÏ´Â ¹æÇâÀ¸·Î ¹ßÀüÇÏ°í À־ SSD ³»ºÎÀÇ µ¿ÀÛ ´ÜÀ§°¡ ¿î¿µÃ¼Á¦ÀÇ ºí·Ï Å©±âº¸´Ù ÈξÀ Ä¿Áö°Ô µÇ¾ú´Ù. ÀÌ ³í¹®Àº ÀÌ·¯ÇÑ SSDÀÇ Æ¯Â¡°ú °æÇâÀ» ¼ö¿ëÇÏ¿©, Á¦¾ÈÇÏ´Â ¼±¹ÝÀÔ ±â¹ýÀº SSDÀÇ µ¿ÀÛ ´ÜÀ§·Î ¼öÇàµÇ¸ç, Á¦¾ÈÇÏ´Â ¸Þ¸ð¸® °ü¸® ±â¹ýÀº ±× ¼±¹ÝÀÔ ±â¹ýÀÇ ´ÜÁ¡À» º¸¿ÏÇÏ¿©, ij½Ã È÷Æ®À²°ú ¼±¹ÝÀÔ È÷Æ®À²ÀÇ ÇÕÀÌ ÃÖ´ë°¡ µÇµµ·Ï, ¼±¹ÝÀԵǾúÁö¸¸ »ç¿ëµÇÁö ¾Ê´Â µ¥ÀÌÅ͸¦ ÀûÀÀÀûÀ¸·Î ÅðÃâÇÑ´Ù. º» ±â¼úÀº ¸®´ª½º Ä¿³Î ¸ðµâ·Î °³¹ßÇÏ¿´À¸¸ç ½ÇÁ¦ SSD¸¦ »ç¿ëÇÏ¿© ¼º´É Æò°¡¸¦ ½Ç½ÃÇÏ¿´´Ù. ÁÖ¾îÁø ½ÇÇè¿¡¼­ Á¦¾ÈÇÏ´Â ¼±¹ÝÀÔ ±â¹ýÀÌ ¾à 26%±îÁö ¼º´ÉÀ» Çâ»ó½ÃÄ×´Ù.
¿µ¹®³»¿ë
(English Abstract)
Traditional technologies that are used to improve the performance of hard disk drives show many negative cases if they are applied to solid state drives (SSD). Access time and block sequence in hard disk drives that consist of mechanical components are very important performance factors. Meanwhile, SSD provides superior random read performance that is not affected by block address sequence due to the characteristics of flash memory. Practically, it is recommended to disable prefetching if a SSD is installed in a personal computer. However, this paper presents a combinational method of a prefetching scheme and a memory management that consider the internal structure of SSD and the characteristics of NAND flash memory. It is important that SSD must concurrently operate multiple flash memory chips. The I/O unit size of NAND flash memory tends to increase and it exceeded the block size of operating systems. Hence, the proposed prefetching scheme performs in an operating unit of SSD. To complement a weak point of the prefetching scheme, the proposed memory management scheme adaptively evicts uselessly prefetched data to maximize the sum of cache hit rate and prefetch hit rate. We implemented the proposed schemes as a Linux kernel module and evaluated them using a commercial SSD. The schemes improved the I/O performance up to 26% in a given experiment.
Å°¿öµå(Keyword) ¼±¹ÝÀÔ   ij½Ã   SSD   Ç÷¡½Ã   Prefetching   Cache   Solid State Drive   Flash  
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