深入单机性能极限_diogin

正常使用极限状态设计极限状态设计（Extreme State Design）是一种软件开发方法，旨在测试系统在极端条件下的性能和稳定性。

通过模拟各种极限情况，包括大量并发用户、超出系统容量的数据，以及异常输入等，极限状态设计可以帮助开发团队发现系统的潜在问题并提前解决。

在实施极限状态设计时，首先需要明确系统的业务需求和性能指标。

然后，根据这些指标确定测试的极限条件，例如最大并发用户数、数据处理速度等。

接下来，我们可以通过工具和技术来模拟这些条件，例如使用压力测试工具来模拟大量并发用户，或者使用数据生成工具来生成超出系统容量的数据。

极限状态设计的一个重要目标是发现系统的瓶颈和性能问题。

通过模拟极限条件，我们可以观察系统在负载高峰期间的响应速度和资源利用情况。

如果系统在处理大量用户或超量数据时变慢或崩溃，那么说明系统存在性能问题，需要进行相应的优化和调整。

除了性能问题，极限状态设计还可以帮助发现系统在异常情况下的稳定性。

通过模拟各种异常输入和故障情况，例如错误的用户输入、网络中断等，我们可以观察系统的行为和处理能力。

如果系统在异常情况下无法正确响应或出现严重错误，那么说明系统存在缺陷，需要进行修复。

极限状态设计具有很高的指导意义。

通过测试系统在极端情况下的性能和稳定性，我们可以识别出潜在的问题，并及时采取措施进行改善。

这样可以提高系统的可靠性和性能，为用户提供更好的体验。

此外，极限状态设计还可以帮助团队优化系统的资源利用，提高系统的扩展性和可伸缩性。

通过对系统资源的合理规划和管理，以及对系统各个组件的优化，我们可以使系统更好地适应不断增长的用户和数据量。

总之，极限状态设计是一种全面有效的测试方法，对于开发团队来说具有重要的指导意义。

通过模拟各种极限条件，我们可以发现系统的问题并进行相应的优化和改善，从而提高系统的性能和稳定性。

因此，在软件开发过程中，我们应该充分应用极限状态设计，以保证系统的质量和可靠性。

INSTALLATION INSTRUCTIONS FOR T HE NEW DESIGN PISTON FOR 582 ULWITH MONO HOOK PISTON PIN CIRCLIP GROOVESSI-2ST -001Repeating symbols:Please, pay attention to the following symbols throughout the Service Bulletin emphasizing particular information.v WARNING:Identifies an instruction, which if not followed, may cause serious injuryor even death.s ATTENTION:Denotes an instruction which if not followed, may severely damage theengine or could lead to suspension of warranty.x NOTE:Information useful for better handling.1)Planning information1.1)Engines affectedAll versions of the engine type:-582 UL DCDI model 90-582 UL DCDI model 99-618 UL DCDIThe piston part no. 888.590 for mono-hook circlip part no. 845.540 were introduced into serial production as of the following serial number:-582 UL DCDI model 90: from S/N 5,236.549-582 UL DCDI model 99: from begin of serial production1.2)Concurrent SB/SI und SLnone1.3)ReasonIn the course of further development the piston part no. 888.590 and the mono-hook circlip part no. 845.540 to secure the piston pin have been introduced.1.4)SubjectInstallation instructions and general notes for installation of the piston 888.590and the mono-hook circlips 845.540.d 005171.5)Fristen-INFORMATIONThis information is intended to assist the aircraft builder and operator inachieving the proper operating conditions, correct engine installation andconsequently optimum performance and reliability.-At installation of the mono-hook circlips proceed as per the following instructions.x NOTE:The piston part no. 888.590 replaces the piston part no. 887.080once out of stock. Up to now it is installed in engine 582 UL DCDImodel 90 and in engine 618 UL DCDI.As long as in stock the piston 887.080 may be used further inengine 582 UL DCDI model 90 and in engine 618 UL DCDI.v WARNING:On engine 582 UL DCDI model 99 only the piston part no.888.590 is allowed to be used.v WARNING:The piston part no. 888.590 must be used together with mono-hook circlip 845.540.1.6)Approvalnot necessary1.7)Manpower-estimated man-hours:engine installed in the aircraft - - - manpower, depending oninstallation and therefore no statement is feasible from theengine manufacturer.1.8)Mass data-change of weight - - - none-moment of inertia - - - unaffected1.9)Electrical load datano change1.10)Software accomplishment summaryno change1.11)ReferencesIn addition to this technical information refer to-current issue of the Operator´s Manual-engine data sheet-power, torque and fuel consumption curves-current issue of the illustrated parts catalog-engine installation instruction and installation check list-all service information regarding your engine-Repair Manual1.12)Other publications affectednone1.13)Interchangeability of partsall redundant parts which cannot be used must be destroyed2)Material Information2.1)Material - cost and availabilitycost and availability will be supplied on request by ROTAXâauthorized distributors.2.2)Company support informationnone2.3)Material volume per engineparts volume:The following parts are readily available for installation:item no.New Qty.Description Old remarks part no.part no.845.540as reg´d mono hook circlip582 / 618888.590as reg´d piston582 / 618888.591as reg´d piston 1st oversize582 / 618888.592as reg´d piston 2nd oversize582 / 6182.4)Material volume per spare partnone2.5)Rework of partsnone2.6)Special tooling - Price and availability-Price and availability will be supplied on request by ROTAXâ AuthorizedDistributors or their Service Center.-parts volume:For the installation of the mono hook circlip the following new tool isnecessary:item no.New Qty.Description Old remarks part no.part no.877.805as reg´d installation pusher582 / 6183)Accomplishment / InstructionsAccomplishmentAll the measures must be taken and confirmed by the following persons or facilities: -ROTAX-Distributors or their Service Center®-Persons with the respective Aviation Authority permission.-Persons with type-specific training (applicable only for non-certified engines)v WARNING:Proceed with this work only in a non-smoking area and not near open flames. Switch off ignition and secure engine against unintentionaloperation.-Secure aircraft against unauthorized operation.-Disconnect minus pole of aircraft battery.v WARNING:Proceed with work on a cold engine and grounded ignition only.3.1)Installation of the piston and fitting of the mono-hook circlipsPush new mono-hook circlip into circlip installation sleeve (3) (fig. 1). The slot in the circlip should be positioned as shown in fig. 1- view A with the hook on the right side viewed from back of the installation tool. Slide the sleeve on the installation pusher (1) (fig. 1) and insert the installation pusher into the positioning gauge (5) (fig.2) and push circlip to a positive stop. The installation pusher assembly with the guidance pin can now be inserted into the piston pin (see fig.1).x NOTE:The slot (2) (fig. 1) in the installation sleeve has to align withmono-hook circlip groove in the piston.Support the piston with one hand and with the other hand insert the mono-hook circlip by a firm push into groove in piston.Check mono hook circlip for tight fit.v WARNING:If circlip is improperly fitted it may rest incorrectly. In a case likethat remove circlip again and fit a new one into correct position.Proceed the same way on the other side of piston.v WARNING:Use mono-hook circlips only once. Scrap removed circlips.Circlip installation tool to be handled with caution to preventinjury by escaping circlips.Proceed in accordance with instructions stated herein. Themeasures have to be taken by ROTAX, Rotax-distributors ortheir Service CentersNon-compliance with these recommendations could result inengine damage, personal injuries or death!3.2)Test run:Start the engine. Conduct testrun inclusive ignition check and leakage test in accordance with the current Maintenance Manual of the engine type.3.3)Summaryv WARNING:Non-compliance with these recommendations could result inengine damage, personal injury or death!Approval of translation to best knowledge and judgement - in any case the original text in German language and the metric units (SI-system) are authoritative.03108036004)Appendix。

Built for GamingThe WRT32X takes gaming to the next level. The router built purely forgaming features AC3200 speed and the Killer Prioritization Engine. TheKiller Prioritization Engine identifies, prioritizes and accelerates gamingnetwork traffic above all other devices in your home to deliver a faster,superior gaming experience. The Killer-enabled WRT32X alsosynchronizes with Killer-enabled PCs to give gaming traffic the highestpriority on your network. Turning the Killer Engine on protects fromextreme lag spikes and reduces lag by 77%, delivering consistent andsuperior reaction time during intense gaming scenarios.Elite Features• 1.8 GHz CPU: Dual-Core promotes simultaneoushigh-speed data processing.• Pro-grade Gigabit Ethernet Switch: Gigabit(10/100/1000) is 10X faster than Fast Ethernet.• Dual-Band (2.4 + 5 GHz): N600 + AC2600 Mbps.• Killer Prioritization Engine: The first router thatprioritizes gaming.• Advanced Security: WPA2 encryption and SPI firewallhelp keep your network safely connected.• Customized Gaming Interface: Custom-built interfaceand firmware for gaming traffic control.• 256MB Flash and 512MB of RAM Memory: Handlemore without delay for optimal performance.• 4 High-Performance Antennas: Engineered to enhancedual-band communication; four external, adjustableantennas ensure supreme Wi-Fi signal strength.• eSATA, USB 3.0, and USB 2.0 Ports: Share content viaan external storage device with ultra-fast data transferspeeds. USB 3.0 delivers enhanced performance over USB2.0; eSATA delivers optimal data transfer speeds fromexternal SATA drives and accommodates USB 2.0.Reduce Ping by 77%17msKILLER ON74msKILLER OFFPart NumberUPC / EANPlug TypeWRT32X-EU 745883737321 / 4260184667185Europlug (CEE 7/16)WRT32X-UK 745883737376British (BS1363)WRT32X-ME745883737338 / 4260184667208British (BS1363)Belkin, Linksys, WRT and many product names and logos are trademarks of the Belkin group of companies. Third-party trademarks mentioned are the property of their respective owners. Windows, Windows Vista, Internet Explorer, and the Windows logo are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries. Mac, Mac OS, Safari, and the Mac logo are trademarks of Apple Inc., registered in the U.S. and other countries. Google Chrome is a trademark of Google Inc. Wi-Fi and Wi-Fi Protected Setup are either trademarks or registered trademarks of the Wi-Fi Alliance. The Wi-Fi CERTIFIED Logo and the Wi-Fi Protected Setup Identifier Mark are either trademarks or registered trademarks of the Wi-Fi Alliance. DD-WRT is a registered trademark of embed GMbH. 17PB009© 2017 Belkin International, Inc. and/or its affiliates. All rights reserved.Linksys Pte. Ltd. c/o Belkin BVTupolevlaan 1, 1119 NW Schiphol-Rijk, The Netherlands Made in ChinaPackage Includes:• Linksys WRT32X Wi-Fi Gaming Router • Quick Start Guide • 4 Antennas • Ethernet Cable • Power Adapter Processor:1.8 GHz dual-core ARM-basedSystem Requirements:For Router Setup:Latest versions of Google Chrome™, Firefox ®, Safari ® (for Mac ®or iPad ®), Microsoft Edge, or Internet Explorer ® versions 8 or newer For User Documentation:PC: Wi-Fi enabled with CD or DVD drive, Windows ® XP SP3, Windows Vista ® SP1 or later, Windows 7, Windows 8/8.1, or Windows 10Mac: Wi-Fi enabled with CD or DVD drive, Mac OS ® X Leopard v10.5.8 or later, Snow Leopard v10.6.1 or later, Lion v10.7, Mountain Lion v10.8, Mavericks v10.9, or Y osemite v10.10User Documentation is also available at: /supportData Rates:802.11a/g: up to 54 Mbps802.11n (2.4 GHz): up to 600 Mbps 802.11ac (5 GHz): up to 2.6 GbpsWireless Operating Spectrum:Simultaneous Dual-Band 2.4 GHz and 5 GHzWireless-AC T echnology for Powerful Networking Wireless Encryption:WPA2-Personal VPN Support:PPTPIPSec pass-through Memory:256MB Flash512MB DDR3 RAMLED:Power, Internet, 2.4 GHz, 5 GHz, eSATA, USB1 (USB 2.0), USB2 (USB 3.0), LAN 1–4 (activity/10/100 Mbps), LAN 1–4 (1 Gbps), WPS Storage File System Support:FAT, NTFS, HFS+, and ext4Power Adapter:Input: 100-240V ~ 50-60 Hz Output: 12V/3AWireless Specifications:Wireless Standards with Link RateIEEE 802.11ac (up to 2600 Mbps for 5 GHz‡)IEEE 802.11n (up to 600 Mbps for 2.4 GHz/ up to 450 Mbps for 5 GHz‡)IEEE 802.11g (up to 54 Mbps‡)IEEE 802.11a (up to 54 Mbps‡)Operating Frequencies:2412-2472MHz,5180-5240, 5260-5320, 5500-5700 MHz Output Power:2412-2472MHz: 19.97dBm 5180-5240MHz: 22.96dBm 5260-5320MHz: 22.97dBm, 5500-5700: 29.96dBm Antenna Gain: 2.4GHz: 2.52dBi, 5GHz: 3.81.Bluetooth: 3.6 dBi Antenna Type: Wi-Fi: Di-Pole Bluetooth: PIFAPorts:1x Gigabit WAN port 4x Gigabit LAN ports1x combo USB 2.0/eSATA §1x USB3.0§PowerUSB/eSATA ports for sharing photos, videos, music, and files on an attached storage drive via SAMBA or FTP , or for sharing a printer.Product Weight (Kg.): 0.86Product Depth (cm): 24.79Product Width (cm): 19.48Product Height (cm): 5.11Unit Weight (Kg.): 1.64Unit Depth (cm): 31.90Unit Width (cm): 11.39Unit Height (cm): 23.72Case Pack Quantity (*PL): 2Case Pack Weight (Kg.) (*PL): 3.70Case Pack Depth (cm) (*PL): 33.68Case Pack Width (cm) (*PL): 24.37Case Pack Height (cm) (*PL): 26.06Specifications are subject to change without notice.An active, customer-purchased Internet Service Provider broadband account is required for connection of this router and other connected computers and devices to the Internet.Some devices may require additional wireless adapters or an Ethernet cable to connect to this router.*“Killer reduces peak ping by 77%" calculated from the reduction of peak ping rate from 74 milliseconds (ms) to 17 ms when using the Killer Prioritization Engine on the WRT32X and a Killer-enabled PC us-ing a 10 megabits per second (Mbps) down/2Mbps up internet connection that has multiple devices consuming the 10Mbps connection.†May require a software/firmware update available for download at /support.‡ The standard transmission rates—450 Mbps or 2600 Mbps (for 5 GHz), 600 Mbps (for 2.4 GHz), 54 Mbps—are the physical data rates. Actual data throughput will be lower and may depend on the mix of wireless products used and external factors.GIGABIT ETHERNETPORTSWi-Fi PROTECTEDSETUP™eSATA/USB 2.0USB 3.0 PORTINTERNET。

Linux 性能调优1.Profiling几种工具profiling 包括几种：cpu profiling，即提到的性能分析。

memory profiling，即分析程序性能。

network profiling，即网络流量的分析。

另外，profiling又分两种：1, sampling。

即采样方式。

2, instruments，即插装代码技术。

（包含: 编译期间，链接期间，运行期间）。

oprofile ---- 属于sampling 方式，即不影响程序行为，也不需要重启程序，它是对cpu进行采样分析。

gprof ---- 属于插装技术，需在编译期间增加-pg 选项，属于GNU 部分，不需安装，随着gcc附带。

valgrind--- 属于插装技术，需要在运行期间增加valgrind选项。

（其中massif工具用于内存分析，callgrind用于性能分析）google-perftools ---- 属于插装技术，需要在链接期间增加-L/usr/lib -lprofiler 选项。

2.gprof 分析linux程序性能瓶颈gcc -pg -o test test.ctest运行的时候会把搜集的信息保存在gmoun.out中fedora 不能使用-lc_p选项的问题一般gprof只能查看用户函数信息。

如果想查看库函数的信息，需要在编译是再加入“-lc_p”编译参数代替“-lc”编译参数，这样程序会链接libc_p.a库，才可以产生库函数的profiling信息。

需要安装glibc-profile,下载地址http://ftp.riken.jp/Linux/fedora/core/updates/2/i386/glibc-profile-2.3.3-27.1.i386.rp。

gprof hello gmon.out -p 得到每个函数占用的执行时间gprof hello gmon.out -q 得到call graph，包含了每个函数的调用关系，调用次数，执行时间等信息。