Cluster Grid Interconects. Tony Kay Chief Architect Enterprise Grid and Networking
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1 Cluster Grid Interconects Tony Kay Chief Architect Enterprise Grid and Networking
2 Agenda Cluster Grid Interconnects The Upstart - Infiniband The Empire Strikes Back - Myricom Return of the King 10G Gigabit Summary
3 Agenda Cluster Grid Interconnects
4 Cluster Grid Problems Performance often Interconnect determined 3 rd party interconnects (IB, Myrinet, Quadrics) Expensive (Card + Port) Limitations ISV Support OS Support Scalability Not all address the storage issue NAS still rules, DAS expensive
5 DRAFT Workload Performance Factors Processor speed, capacity and throughput Memory capacity System interconnect latency & bandwidth Network and storage I/O Operating system scalability Visualization performance and quality Optimized applications Network service availability #1 issue for real world cluster performance and scaling
6 DRAFT The Grid Architecture Dilemma: Scale Vertically or Scale Horizontally? Scale Vertically: Parallel applications: OpenMP Large Shared Memory Top Performance Higher acquisition cost Lower development and management complexity & cost $/CPU The Deciding Factor What do the workloads require? Scale Horizontally: Serial and parallel applications: MPI Throughput Lower acquisition cost Higher development and management complexity & cost
7 Right Interconnect for the job 900 dual CPU Nodes: 7 x 256 CPU clusters 3 x 256 CPU I/O intense Gigabit (dual) 4 x 256 CPU MPI intense Gigabit (TCP/IP) Myrinet (MPI) Choose right interconnect for the job Sun's CRS build 38 racks containing 1,800 CPU cluster nodes (6 lorry loads) Final Delivery: 1 lorry load
8 Good News Interconnects are getting: Faster Lighter Greater throughput per %CPU Cheaper Multi-protocol support Infiniband FCAL, Ethernet friendly Myrinet Ethernet friendly
9 Bad News what to buy in 2005? No clear winner in 2005 Myrinet 'De facto' legacy standard? IB The promise of a 'single fabric' 10Gigabit Ethernet Undisputed Networking World champion? 1995 Token Ring 199x FDDI 199x ATM Myrinet & Infiniband - TBA?
10 Agenda The Upstart - Infiniband
11 Why Infiniband Open 'Standard' Price dropping quickly Number of players: Mellanox, Infinicon, TopSpin, Voltaire Optimised; Low Latency, High Bandwidth Dual port 10GBps PCI-X now (850MB/s sustained) 30GB/s PCI Express coming 1 Port, 3 roles: Cluster (MPI) LAN TCP/IP Storage
12 Infiniband Protocols - Rich Host to Host - SDP (Sockets Direct Protocol) Storage SRP (SCSI RDMA protocol for IB and IB to FC bridges) Network - TCP termination and IPoverIB Also used for MPI, DAFS, NDIS, VIA End End Node Node End Rich ISV support for API's Node End Node Switch Only 'Open' RDMA End Node Switch Switch End Node Switch End Node End Node End Node End Node
13 Infiniband and Oracle 10G RAC release 1 Currently Red Hat Enterprise Linux Solaris port underway Topspin and Voltaire port underway SQL*NET InfiniBand SDP/IB Cluster interconnect udapl DB Server Application Servers
14 Agenda The Empire Strikes Back - Myricom
15 Myrinet Dominant MPI Interconnect today Good OS and ISV support Good performance Light on host operating HW/SW Improving road-map Infiniband and threat of 10G forcing: Innovation Big cost reduction
16 Myricom Keeping itself Relevant? Myrinet 10G 'Look and feel' like 10 Gigabit Ethernet (10 Gbe) But lower latency Lower host CPU overhead Protocol offload Same physical infrastructure 10Gbit/s full duplex Compatible with Myrinet-2000 Same APIs and application support Similar switches, different data rate
17 Myrinet Protocol Support Low-level APIs GM 1 (legacy), GM 2 (current standard), MX (new), 3rd party (e.g., SCore PM) TCP/IP & UDP/IP Ethernet emulation, included in all GM and MX releases 1.95 Gb/s TCP/IP netperf benchmarks on Linux (2.4, 2.6) MPICH-GM, MPICH-MX An implementation of the Argonne MPICH directly over GM or MX. Third-party MPI implementations over Myrinet are also available. VI-GM, VI-MX An implementation of the VI Architecture API directly over GM or MX. Sockets-GM, Sockets-MX An implementation of UNIX or Windows sockets (or DCOM) over GM or MX. Completely transparent to application programs. Use the same binaries! Additional middleware in development e.g., udapl and kdapl (for distributed data bases and file systems DB2, Oracle 10g,...)
18 Agenda Return of the King 10G Gigabit
19 10G Ethernet (10 Gbe) Gigabit Ethernet Ubiquitous Track record for 'killing' all comers: Token Ring, FDDI, ATM Myrinet next? Infiniband TBA? Faster obviously! Lower latencies More Capable Start-up activity Storage capabilities
20 10Gbe Faster 10x throughput Latencies falling e.g (figures changing) Gigabit 10 Gbe 40-60us MPI over TCP/IP for simpler Linux stack 16us MPI over TCP/IP with user-mode stack Over TCP/IP, 9usec Over MPI 7 usec Lots of work around: TOE, RDMA, Etherfabric
21 10Gbe Momentum Lots of start-ups Level 5 networks Ammasso Chelsio S2IO Plus Myricom 'support' Impact of iscsi?
22 Agenda Summary
23 Summary Good news Everything's getting faster And Cheaper (both cost and also impact on host) More flexible Advice Better interoperability Richer protocols Look to the future what do you need Buy what best supports your applications Look at the new features Can you take advantage of these?
24 Cluster Grid Interconnects
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