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Current Result Document :

ÇѱÛÁ¦¸ñ(Korean Title) ¼öÁ¤ ºñ·Ê ÁöºÐ ½ºÄÉÁì·¯ ¹× Æò°¡¹ý ¼³°è
¿µ¹®Á¦¸ñ(English Title) A Modified Proportional Scheduler and Evaluation Method
ÀúÀÚ(Author) ±èÇöö   ¹ÚÁ¤¼®   Hyun-Chul Kim   Jeong-Seok Park  
¿ø¹®¼ö·Ïó(Citation) VOL 03 NO. 02 PP. 0015 ~ 0026 (2002. 04)
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(Korean Abstract)
ºñµð¿À³ª ¿Àµð¿À ½ºÆ®¸²°ú °°Àº ó¸® ¿ä±¸ Á¶°ÇÀÌ ÁÖ±âÀûÀ¸·Î ¹ß»ýÇÏ´Â µ¥ÀÌÅ͵éÀº Àü¼ÛÀ̳ª Àç»ý ½Ã ½Ã°£ÀûÀÎ Á¦¾àÁ¶°ÇÀ» °¡Áø´Ù. ÀϹÝÀûÀÎ ½Ç½Ã°£ ½ºÄÉÁÙ¸µ ¾Ë°í¸®ÁòÀº ÀÌ·¯ÇÑ ¿¬¼Ó¼ºÀ» °í·ÁÇÏÁö ¾Æ´ÏÇϹǷΠ¸ÖƼ¹Ìµð¾î µ¥ÀÌÅ͸¦ ½ºÄÉÁÙ¸µÇϱ⿡ ÀûÀýÇÏÁö ¾Ê´Ù. ºñÀ²Á¶Á¤ ºñ·ÊÁöºÐ ½ºÄÉÁÙ·¯´Â ¸ÖƼ¹Ìµð¾î µ¥ÀÌÅÍÀÇ ¿¬¼Ó¼ºÀ» °í·ÁÇÏ¿© ¼³°èµÈ ½ºÄÉÁÙ¸µ ¾Ë°í¸®ÁòÀÌ´Ù. ÀÌ ¾Ë°í¸®ÁòÀº ŽºÅ©°¡ ÀÚ½ÅÀÇ ÁöºÐº¸´Ù ´õ ¸¹Àº ÀÚ¿øÀ» ÇÒ´ç¹ÞÁö ¸øÇϵµ·Ï Á¦¾îÇϱâ À§ÇØ ºñÀ²Á¶Á¤±â¸¦ »ç¿ëÇÑ´Ù. ±×·¯³ª ¾ö°ÝÇÑ ºñÀ²Á¶Á¤±â·Î ÀÎÇØ ºñÀ²Á¶Á¤ ºñ·ÊÁöºÐ ½ºÄÉÁÙ·¯´Â ÀÚ¿ø ÇÒ´çÀÇ °øÁ¤¼ºÀ» º¸ÀåÇÏÁö ¸øÇÏ°Ô µÈ´Ù. ÀÌ´Â °úºÎÇÏ»óȲ¿¡¼­ ½Ã½ºÅÛÀÇ ¼º´ÉÀÌ ±Þ°ÝÇÏ°Ô °¨¼ÒµÇ´Â ¿øÀÎÀÌ µÈ´Ù. º» ³í¹®¿¡¼­ Á¦½ÃÇÏ´Â ¼öÁ¤µÈ ºñ·ÊÁöºÐ ½ºÄÉÁÙ·¯´Â ¿¬¼Ó¼º, ½Ã°£ Á¦¾à¼º°ú °°Àº ¸ÖƼ¹Ìµð¾î µ¥ÀÌÅÍÀÇ Æ¯¼ºÀ» °í·ÁÇÒ »Ó¸¸ ¾Æ´Ï¶ó ºñÀ²Á¶Á¤±â¸¦ ¼öÁ¤ÇÏ¿© ÀÚ¿ø ÇÒ´çÀÇ °øÁ¤¼ºÀ» À¯ÁöÇÏ°í °úºÎÇÏ ½Ã¿¡ ¼º´ÉÀÌ Á¡ÁøÀûÀ¸·Î ÀúÇÏµÇ°Ô ÇÑ´Ù. ¶ÇÇÑ ¿ì¼±±Ç Á¤Ã¥À» »ç¿ëÇÏ¿© ¹®¸Æ±³È¯ Ƚ¼ö¸¦ ÁÙÀδÙ. º» ³í¹®¿¡¼­ Á¦½ÃÇÏ´Â ½ºÄÉÁÙ¸µ ¾Ë°í¸®ÁòÀÇ ¼º´ÉÀ» ÃøÁ¤Çϱâ À§ÇØ ½ºÄÉÁÙ¸µ ¾Ë°í¸®ÁòÀÇ À¯¿¬¼ºÀ» ÃøÁ¤ÇÒ ¼ö ÀÖ´Â Æò°¡ ¹æ¹ýÀ» Á¦½ÃÇÏ°í, Æò°¡ °á°ú¸¦ º¸ÀδÙ.
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(English Abstract)
Since multimedia data such as video and audio data are displayed within a certain time constraint, their computation and manipulation should be handled under limited condition. Traditional real-time scheduling algorithms could net be directly applicable, because they are not suitable for multimedia scheduling applications which support many clients at the same time. Rate Regulating Proportional Share Scheduling Algorithm is a scheduling algorithm considered the time constraint of the multimedia data. This scheduling algorithm uses a rate regulator which prevents tasks from receiving more resource than its share in a given period. But this algorithm loses fairness, and does not show graceful degradation of performance under overloaded situation, This paper proposes a new modified algorithm. namely Modified Proportional Share Scheduling Algorithm considering the characteristics of multimedia data such as its continuity and time dependency, Proposed scheduling algorithm shows graceful degradation of performance in overloaded situation and the reduction in the number of context switching, Furthermore, a new evaluation method is proposed which can evaluate the flexibility of scheduling algorithm.
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