1 Performance & Scalability of SAS Business Analytics on an NEC Express5800/A1080a (Intel Xeon 7500 series-based Platform) using Red Hat Enterprise Linux 5 SAS Business Analytics Base SAS for SAS 9.2 Red Hat Enterprise Linux 5.4 NEC Express5800/A1080a 8 Socket Intel Xeon 7500 series-based platform (8 Cores / Socket = 64 Cores 2 Threads / Core = 128 Threads) Version 1.0 April 2010
2 Performance & Scalability of SAS Business Analytics on an NEC Express5800/A1080a (Intel Xeon 7500 series-based Platform) using Red Hat Enterprise Linux Varsity Drive Raleigh NC USA Phone: Phone: Fax: PO Box Research Triangle Park NC USA "Red Hat," Red Hat Enterprise Linux, the Red Hat "Shadowman" logo, and the products listed are trademarks or registered trademarks of Red Hat, Inc. in the United States and other countries. Linux is a registered trademark of Linus Torvalds. All other trademarks referenced herein are the property of their respective owners by Red Hat, Inc. This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, V1.0 or later (the latest version is presently available at The information contained herein is subject to change without notice. Red Hat, Inc. shall not be liable for technical or editorial errors or omissions contained herein. Distribution of modified versions of this document is prohibited without the explicit permission of Red Hat Inc. Distribution of the work or derivative of the work in any standard (paper) book form for commercial purposes is prohibited unless prior permission is obtained from Red Hat Inc. The GPG fingerprint of the key is: CA B D6 9D FC 65 F6 EC C CD DB 42 A6 0E 2
3 Table of Contents 1 Executive Summary Test Configuration Hardware... 7 NEC Express5800/A1080a Server... 7 NEC D3 SAN Storage Array... 8 Intel Xeon Processor 7500 Series SAS Red Hat Enterprise Linux Test Methodology Test Execution Data Performance Results Performance Effects of NUMA RHEL Observations & Tuning SAS Tuning Guidelines Conclusions
5 1 Executive Summary Today, companies are increasingly utilizing analytics to discover new revenue and costsaving opportunities. Many business professionals turn to SAS, a leader in business analytics software and service, to help them improve performance and make better decisions faster. Analytics are also being employed in risk management, fraud detection, life sciences, sports, and many more emerging markets. However, to maximize the value to the business, analytics solutions need to be deployed quickly and cost-effectively, while also providing the ability to readily scale without degrading performance. Of course, in today s demanding environments, where budgets are still shrinking and mandates to reduce carbon footprints are growing, the solution must deliver excellent hardware utilization, power efficiency, and ROI. To help solve these challenges, Red Hat, SAS, NEC, and Intel collaborated to prove the linear scalability of SAS 9.2 running Red Hat Enterprise Linux on NEC s newest Intel Xeon processor 7500 series-based platform. The result is a pre-tested, scalable server configuration that can help you deploy faster, reduce risk, lower cost, and plan for future upgrades. Game changing performance and scalability The ability to take advantage of performance enhancements in the latest processors and the ability to tune I/O and virtual memory, makes Red Hat Enterprise Linux an ideal platform for SAS Business Analytics. Industry benchmarks reflect the scalability and performance of Red Hat Enterprise Linux in both scale-up (vertical) and scale-out (grid) models. The SAS 9.2 test results documented here demonstrate excellent scalability up to 64 cores (128 threads) on a single system. 5
6 2 Test Configuration System Configuration: NEC Express5800/A1080a system 8 Intel Xeon processor 7500 series (8 cores per socket) 64 total cores/128 threads Intel Hyper-threading Technology on Intel Turbo Boost Technology on 256 GB RAM 4 x external NEC D-series storage arrays 30 x 1 TB SATA 7200 RPM disk per array 16 x 4 G-bit fiber connections to disk Note: Half the CPU cores, RAM and storage was used for the 32-core test. SAS Software: Foundation SAS 9.2, SAS/STAT Operating System: Red Hat Enterprise Linux 5.4z 64-bit 6
7 2.1 Hardware NEC Express5800/A1080a Server Figure 1 Designed specifically for the Intel Xeon processor 7500 series and scalable from 8 to 64 processor cores and up to 128 threads, the NEC Express5800/A1080a server is an ideal 7
8 platform for scaling up or consolidating SAS 9.2 instances. This server takes advantage of the intelligent performance, energy efficiency, and virtualization capabilities of the Intel Xeon processor and leverages the low latency and high-performance interface technology of NEC s supercomputers. The server supports modular designs, redundant components, hot plug capabilities, and floating I/O. Additional benefits include: Up to 64 cores, 128 threads, and 2 TB memory Integrated Intel Quick-Path Interconnect technology to increase performance through efficient memory access Green Cooling Technology that helps to minimize power consumption and automate power usage for more effective datacenter consolidation benefits Built-in service processor working in conjunction with NEC s BIOS and Intel s Machine Check Architecture to provide reliability, availability, and serviceability for mission-critical computing Server virtualization that offers high performance, energy efficiency, and higher server bandwidth to handle the increased communications in a virtualized environment NEC D3 SAN Storage Array The NEC D3 SAN Storage Array offers scalability to 288 TB and aggregate throughput of over 1,100 MB/s. The system is fully redundant to protect against single point of failure, with a battery backup unit to protect its 4 GB of cache. Features include replication, snapshots, performance monitoring, automatic tuning, multipathing, and failover. Intel Xeon Processor 7500 Series Intel Xeon Processor 7500 Series is built to handle your most processor-intensive, mission-critical applications, the Intel Xeon processor 7500 series delivers a quantum leap in enterprise computing performance. The Intel Xeon processor 7500 series combines up to eight cores and 16 processing threads in a single device and offers four advanced, high-bandwidth interconnect links that allow multiple processors to be directly connected to each other. The result is unprecedented scalability. 8
9 Figure 2 The Intel Xeon processor 7500 series intelligently adjusts performance and energy consumption to accommodate application needs. Built-in Intel Turbo Boost Technology automatically speeds up the processor when your SAS workload requires extra performance. Intel Hyper-Threading Technology allows each processor core to work on two tasks at the same time to enhance performance for highly-threaded workloads. Intel Intelligent Power Technology automatically places CPUs and memory into an optimal power state for maximum performance, while reducing energy use. 9
11 2.2 SAS 9.2 SAS 9.2 provides the core components of the SAS Business Analytics Framework and significant performance improvements over SAS 9.1 on Linux. SAS 9.2 helps users gain insights that are often hidden in data, so they can reach evidence-based decisions with confidence. SAS 9.2 supports the entire analysis process from data access to the point of decision however varied or complex. A wide range of data integration techniques empowers users to collect, classify, process, analyze, and interpret data to reveal new insights. SAS 9.2 advances the capabilities of SAS analytical products, including forecasting, data mining, optimization, and model management. SAS Analytics provide rapid answers to key business questions, allowing decision makers to react more quickly to fast changing conditions. SAS 9.2 is available as 64-bit enabled applications supporting 64-bit extended architectures. This enables you to scale up or consolidate multiple SAS instances within one affordable, powerful, commodity system. 2.3 Red Hat Enterprise Linux 5.4 Red Hat Enterprise Linux performance features include: SMP performance and scalability. Multi-process or threaded applications can be optimally scheduled in large SMP systems. A vast virtual address space enables SAS Business Analytics to effectively use more memory to work on larger data sets. Enhancements enable applications to effectively use more processors. Intelligent performance. Efficient use of software threads, support for hyperthreading technology, and the ability to change the clock speed on a running processor increase performance. Automated energy efficiency. Power technologies from Intel and AMD and optimizations in the operating system lower power consumption during off-peak times. Consuming less power means lower cooling requirements, which contributes to further savings and greener datacenters. Tuning for optimum I/O throughput. I/O performance can be optimized on a perdevice basis. Support for 10 gigabit Ethernet, iscsi, and Fibre Channel over Ethernet allow the latest storage technologies to be used. MPIO allows multiple connections from servers to storage to increase availability and throughput. 11
12 3 Test Methodology SAS created multiuser benchmarking scenarios to simulate the workload for a typical Foundation SAS customer. The goal of these scenarios was to evaluate the multiuser performance of SAS on various platforms. Various-sized mixed analytic workloads were created to simulate many users utilizing CPU, RAM and I/O resources that SAS programs heavily use during typical program execution. A 32-core and 64-core test scenario was executed with the help of Intel, Red Hat and NEC staff on a 64-core NEC Express5800/A1080a system running Red Hat Enterprise Linux 5.4z. 3.1 Test Execution The two scenarios used in the performance efforts included the following: 1) Mixed 32-core workload mix of CPU- and I/O-intensive jobs: a. 206 jobs launched during the scenario. b. PROCS: GLM, LOGISIC, RISK, REG, MEANS, SORT, FREQ, SUMMARY, SQL. c. Mixed shorter and longer running jobs. d. Goal of scenario is to leverage a mix of I/O and CPU resources. e. This version was designed to run on a 32-core system. 2) Mixed 64-core workload mix of CPU- and I/O-intensive jobs: a. 412 jobs launched during the scenario. b. This version was designed to run on a 64-core system. c. This version has twice the jobs as the 32-core test. 12
13 Each test scenario consists of a set of SAS jobs run in a multiuser fashion to simulate a typical SAS batch, SAS Enterprise Guide user environment. All SAS jobs are a combination of computational- and I/O-intensive SAS procedures. Each scenario launches jobs simultaneously at a set interval to help simulate a multiuser environment where users come and go from the system. The test is designed to run in a period of 30 to 60 minutes. 3.2 Data Characteristics of the data for this scenario: SAS data sets and text files. Row counts up to 90 million. Variable counts up to GB total input/output data. File sizes ranging from several kilobytes to 30 GB in size. Data volumes were designed to be larger than the hardware cache in order to place realistic stress on the hardware and operating system file cache. Note: The SAS benchmarking scenarios are designed to replicate a typical Foundation SAS customer s resource use. However, particular customer applications can vary greatly depending on tasks, PROCs used, data volumes and other customer requirements. 13
14 4 Performance Results CPU and I/O utilization patterns for the 32- and 64-core tests were similar. This was expected, as the 64-core workload and CPU resources were doubled from the 32-core workload. CPU utilization ranged from 5 to 95 percent due to the nature of the workload and the way users come and go from the system. Analysis of the data focused on the workload response and run times of both the entire scenario and the sum of all job run times used in each scenario. Below is a table showing the various statistics and how much scalability was achieved going from the 32-core to the 64-core workload and hardware configuration. Cores Sum of all jobs run time in seconds Scenario time (all clock in seconds) Average job run time I/O rates MBps Peak Sustained 64 62,769 2, ,818 1, ,720 2, , The following features contributed to the performance and scalability of the configuration: Intel Advanced Programmable Interrupt Controller (APIC) for optimized Non- Uniform Memory Access (NUMA) Support for Red Hat Enterprise Linux on the new multi-socket NEC Express5800/A1080a server NEC NUMA aware BIOS significant performance gains Red Hat Enterprise Linux processor scheduler automatically optimizes SAS application processes Intel Turbo Boost Technology and Intel Hyper-Threading Technology improved scalability. 14
15 Figure 4: CPU Utilization (64-Core, 256 GB, XFS) Figure 5: CPU Utilization (32-Core, 128 GB, XFS) 15
18 4.1 Performance Effects of NUMA In general, servers with a Non Uniform Memory Architecture (NUMA) configuration, whose BIOS and operating system recognize the hardware layout perform best. Memory allocation policies with NUMA tend to try an allocate on the node where the process is scheduled. When the environment (BIOS/OS) does not properly support the NUMA configuration or has it disabled, memory is typically interleaved across all NUMA nodes. While performance may be more predictable, most of the memory accesses are on a remote node which increases latency. Memory accesses to the remote nodes occur: 3/4 of the time for the 4 socket 32 core configuration 7/8 of the time for the 8 socket 64 core configuration Since not all nodes are guaranteed to be directly connected to each other, the latency cost depends on how many nodes (hops) the memory request must travel through. The 4 socket 32 core configuration provides single hop connectivity to each node. In the 8 socket configuration, half of the nodes are a single hop away while the other half require two hops. For 4-node/32-core configuration there is only a 1-hop latency. Thus, there was a performance improvement of 11% (hw cost of 1-hop=X) if the scheduler can use local memory for the 216 jobs. For the 8-node/64-core configuration there is a variable number of hops (1-hop at X, and 2-hops Y). Thus the performance improvement rose to over 50% by allowing the scheduler to localize a good part of the memory references running up to 432 jobs at the same wall clock time that it took to run 1/2 the jobs on the 4- node/32-core configuration. Without NUMA in the OS, there would be a significant degradation in scaling. The importance of NUMA support in the 8 socket 64 core configuration is shown below. Without NUMA enabled, the higher ratio of remote accesses coupled with the multiple hops reduce the performance throughput significantly. 18
19 Figure 9: Performance Effects of NUMA 19
20 4.2 RHEL Observations & Tuning RHEL 5.4z used for testing and recommended for any Intel Xeon processor 7500 series-based system. RHEL tuning best practices applied using Ktune* SELinux and unneeded services were disabled via chkconfig and sysctcl parameters NUMA (non-uniform memory access) is RHEL 5 default on NEC and all systems based on Intel processors 6000 and 7000 series. Check BIOS to ensure NUMA is enabled or disable memory interleave The I/O output from 8-Socket server exceeded the I/O capacity of test storage configuration. Server utilization would have been significantly greater with more storage controllers. o 1.78 GB/sec peak and 1.39 GB/sec sustained throughput for 64-Core runs o 1.13 GB/sec peak and 885 MB/sec sustained throughput for 32-Core runs Red Hat Enterprise Linux Tunable I/0 stack is essential to SAS performance o Tuned read-ahead on Logical Volume Manager (LVM) devices adjusted to 8192 bytes o Standard blockdev tool to adjust for large sequential access to LVM/filesystem XFS is best suited for large sequential I/O in the SAS Business Analytics workload o 30% improvement in performance over ext3 o Significant reduction is system CPU resources thus providing more compute cycles for more SAS jobs o Support for larger file extents, essential for very large files and provides significantly less file fragmentation and faster file deletion. SAS creates and deletes lots of files. 20
21 4.3 SAS Tuning Guidelines Follow best practices for configuring I/O: Split permanent SAS data files, SAS WORK files, and SAS UTILLOC files into separate file systems Insure you have enough IO bandwidth to support the SAS application requirements Set the IO transfer unit size on storage array to match SAS BUFSIZE value Increase SAS BUFSIZE value if you are doing large volumes of IO 21
22 5 Conclusions The SAS 9.2 mixed analytic workload running on Red Hat Enterprise Linux results highlight: Test results for both computational and mixed analytic benchmarking scenarios. Linear scalability when workload and CPU resources doubled. 32- and 64-core scenarios executed. 206 and 412 job mixed computation and I/O-intensive scenario run in 35 minutes or less. Sustained I/O rates of over 1.4 gigabytes per second during 64-core workload. Peak I/O rates over 1.8 gigabytes per second during 64-core workload. Sustained I/O between 17 and 23 MBps per core during test scenario execution. 22
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