DMA, Infiniband
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Transcript of DMA, Infiniband
DMA, RDMAINFINIBAND vs Gigabit Ethernet
Hallym Univ. Park Chunduck
Bus Architecture• Performance Problem
DMA• Direct memory access (DMA) is a fea-
ture of computer systems that allows cer-tain hardware subsystems to access main system memory (RAM) independently of the central processing unit(CPU).
Gigabit Ethernet• 1970 년대 초 Xerox 사에서 완성된 연구 결과• 오늘날 물리 계층과 링크 계층 프로토콜을 널리
채용하는 데 큰 역할을 하였다 .– 1998. standard IEEE need optical fiber(광섬유)– 2002. fiber standard rectified 승인– 2009. 1Gb -> 10Gb Ethernet change
• join high performance server system market
INFINIBAND• I/O 처리에 따른 성능 저하를 해결하기 위해 1999년 InfiniBand Trade Association(IBTA) 라는 단체 출범• Dell, Intel, Sun, AMD, HP, IBM, 오라클 , 시스코 등 업체가 참여 하였다 . 슈퍼컴퓨터나 HPC(High Perfor-
mance Computing) 에서 서버간 데이터 통신에 사용되고 있다
InfiniBand network topology• HCA(Host Channel Adapter), It is a bridge connecting the
memory controller and TCA• TCA(Target Channel Adapter), It will I/O equipment (for ex-
ample, SCSI controller card) digital signal to send to HCA
InfiniBand network topology• Switch• TCA• HCA• Gateway
인피니밴드 vs. 기가비트 이더넷’ 프로토콜 기술 경쟁• 네트워크 센터 시장에서의 라이벌• Gigabit Ethernet – 중급 규모의 데이터 센터들은 Ethernet 으로 연결 (확장성 )– Now Gigabit Ethernet can be Big HPC System
• InfiniBand– 많은 노드를 Single HPC 에 연결하려면 InfiniBand 를 사용– High Performance Datacenter need Infiniband
Ethernet in the TOP500• mid 2010– Infiniband Ethernet Total
Ethernet and Infiniband in "Industry" Seg-ment
– Infiniband Ethernet
Number of Ports on TOP500 List and Industry Seg-ment
The Tiers• The Uptime Institute categorizes the data
centers by four levels: Tier I, II, III and IV.
• These levels correspond to a certain num-ber of guarantees on the type of hardware deployed in the data center to ensure redundancy( 중복 )
The Tiers• T3(Cold-swap) , T4(Hot-swap)– Hot swap : exchanage device when it working