Linux操作系统11-优化.ppt

AcegeneITCo Ltd 1 Linux操作系统系统优化 周炯上海艾基信息技术有限公司 AcegeneITCo Ltd 2 内容提要 Performanceconceptsandmeasurementtools CPUMemoryDiskI ONetworkProcessProfilingKernel Applications MeasurementTools LinuxhasmeasurementtoolscommontoUNIXplatforms SystemActivityReporter sarHistoricaldatabaseVirtualMemoryStatistics vmstat freeI OStatistics iostatTopResourceConsumers top cX basedtools xosview gnome system monitor ksysguard gkrellm CPUMeasurements IdentifytheCPUstatisticsandinterpretthem Idletime idleExecutingusercode userExecutingsystemcode systemLoadaverage runq szStartwithcat proc cpuinfoTotalCPUcount speedThereareseveralwaystoseethesameinformation forexample CPUactivity CPUActivity mpstat mpstat P mpstat PALL11Linux2 4 21 15 EL raclinux1 08 04 2004CPU user nice system idleintr sall19 500 0031 5049 00111 00027 000 0042 0031 00111 00112 000 0021 0067 00111 00 WhatismyCPUdoing mpstat CPUActivity sar sar u23Linux2 4 21 15 EL raclinux1 08 04 200402 02 34AMCPU user nice system idle02 02 36AMall1 140 001 7197 1402 02 38AMall2 620 003 6693 7202 02 40AMall0 540 003 7895 68Average all1 450 003 0995 46 sar u WhatismyCPUdoing sar CPUActivity iostat iostat c23Linux2 4 21 15 EL raclinux1 08 04 2004avg cpu user nice sys idle5 730 0017 1677 11avg cpu user nice sys idle4 620 0027 1868 21avg cpu user nice sys idle9 550 0035 9654 49 iostat c WhatismyCPUdoing iostat LinuxVirtualMemory EachprocessisassignedacontiguousaddressspaceinvirtualmemorythatmapsprocessmemoryallocationstotherealmemoryUseraddressspaceisacontiguoussetofpagesandislimitedto4GBperprocessPhysicalAddressExtension PAE allowsaccesstomorethan4GBofphysicalmemoryRHat enterprise kernel impliedSMP SuSE 64GBkernel impliedSMP Swap Swapspace disk Physicalmemory RAM Virtualmemory Swapped inpages Swapped outpages MeasuringSwap Howmuchisavailable used swapon s cat proc swaps vmstatso AmountofmemoryKB sSWAPOUTtodisksi AmountofmemoryKB sSWAPINfromdiskswapd AmountofvirtualmemoryKBreservedCreate Addmore mkswap dev sdc3fstab dev sdc3swapswappri 4200 MemoryUsage Kernel notpaged Sharedmemory Processmemory Processmemory Processmemory Pagecache Buffercache Kernelmodules Dynamicallyadjusted Paged Paged locked Notpaged Measurememoryutilizationandpaging Identifythesignificantmemorystatistics cat proc meminfo unitsKB MemTotal TotalphysicalmemoryMemFree TotalfreememoryLowFree Freememorybelow1GBphysicalBuffers LinuxBufferCacheCached LinuxPageCacheBigFree Freebigpagesmemory MeasuringMemoryUsage NoFreeMemory freecommandreportsaverylownumber shouldIbeworriedIt sOKifLinuxbufferorpagecachearebigLookin buffer cacherowoffreeforprojectedfreememoryVeryusefulstat Memory sar Bpagingstatistics Rmemorystatistics Wswappingstatistics sar B sar R AcegeneITCo Ltd 15 MeasuringDiskI O YoushouldmonitortheI Oacrossalldevicesandlookfor slow devicesusing sar iostat vmstatArchivecollectedstatisticsforcomparison AcegeneITCo Ltd 16 NetworkTraffic Checkthefollowingsourcesofnetworktraffic OracleSQL NetServicingSQLconnectionsInterconnectinRACenvironmentNetworkfilesystemSambaHTTPserverStartwithsar nDEViptrafalsoveryuseful sarFlags freadfromsarhistoricalfile var log sa s estart endtimes shh mm ss rmemory swaputilization cprocesscreationactivity wcontextswitchingactivity AcegeneITCo Ltd 18 ProcessSpecific Specificprocessisasuspect Systemcalltrace strace pLibrarycalltrace ltrace pDetailedprocessstatistics ps oTry ps e opid ppid pcpu rss vsz pri wchan cmdWhohasmyfileopen lsof p pid ForProcessTree usepstree pNotseeingaprocess it sprobablyathread try ps efm AcegeneITCo Ltd 19 WhatDoestheKernelDo It spossibletoprofilethekernelandidentifywhereit sspendingtime Bootwith profile 2nmi watchdog 1 EitherinLiloorGruboraddmanuallyatboottimeUsereadprofile mStartwithreadprofile r toresetcounters Veryeasytouse butusefulonlyifyouseehighsystemtime Toprofileuserapplicationsuseoprofile AcegeneITCo Ltd 20 SystemWide RDA RemoteDiagnosticAgent AcegeneITCo Ltd 21 Summary LinuxMonitoringTools Overalltoolssar vmstatCPU proc cpuinfo mpstat topMemory proc meminfo proc slabinfoDiskI Oiostat sarNetwor