RHEL Kernel Performance Optimization, Characterization ... - Red Hat

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oprofile – builtin to <strong>RHEL</strong>4 & 5 (smp)opcontrol – on/off dataopreport – analyze profile●start start collection●r reverse order sort●stop stop collection●t [percentage] theshold●dump output to diskto view●event=:name:count●f /path/filenameExample:# opcontrol –start# /bin/time test1 &# sleep 60# opcontrol –stop●d detailsopannotate●●s /path/sourcea /path/assembly# opcontrol dump
oprofile – opcontrol and opreport cpu_cycles# CPU: Core 2, speed 2666.72 MHz (estimated)Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a unit mask of 0x00 (Unhalted core cycles) count 100000CPU_CLK_UNHALT...|samples| %|397435971 84.6702 vmlinux19703064 4.1976 zeus.web16914317 3.6034 e100012208514 2.6009 ld2.5.so11711746 2.4951 libc2.5.so5164664 1.1003 sim.cgi2333427 0.4971 oprofiled1295161 0.2759 oprofile1099731 0.2343 zeus.cgi968623 0.2064 ext3270163 0.0576 jbd
Page 1 and 2:
RHEL Kernel Performance Optimizatio
Page 3 and 4:
Section 1 System Overview Proces
Page 5 and 6:
Processor typesUniProcessorSymmet
Page 7 and 8:
AMD64 System Numa Memory LayoutS1S2
Page 9: Physical Memory Supported/TestedRHE
Page 13 and 14: IncomesExpendituresDonkey owned 0.7
Page 15 and 16: Perzone page lists Active List
Page 17 and 18: Per NUMANode ResourcesMemory zone
Page 19 and 20: Virtual Address Space Maps 32bit
Page 21 and 22: Linux 32bit Address Space(Hugemem
Page 23 and 24: Memory Pressure32 bitDMA Normal H
Page 25 and 26: User Memory PressureAnonymous/pagec
Page 27 and 28: PageCache/Anonymous memory split(Co
Page 29 and 30: 64bit Memory ReclamationRAMKernel
Page 31 and 32: Per Node/Zone Paging DynamicsUser A
Page 33 and 34: Buffered file system writeMemorycop
Page 35 and 36: Section 2 Analyzing System Perfo
Page 37 and 38: Red Hat Top ToolsCPU ToolsMemory To
Page 39 and 40: vmstat(paging vs swapping)vmstat 10
Page 41 and 42: iostat x of same IOzone EXT3 file
Page 43 and 44: free/numastat - memory allocation[r
Page 45 and 46: pstreeinit ─┬─/usr/bin/sealer
Page 47 and 48: The /proc filesystem /proc●meminf
Page 49 and 50: proc/slabinfoslabinfo version: 2
Page 51 and 52: 32bit /proc//maps[root@dhcp8336
Page 53 and 54: proc/vmstat(RHEL4/RHEL5)cat /proc/v
Page 55 and 56: Alt Sysrq M - RHEL3/NUMASysRq : Sho
Page 57 and 58: Alt Sysrq M - RHEL4 & 5/NUMAFree pa
Page 59: Alt Sysrq W and PSysRq : Show CPUsC
Page 63 and 64: Profiling Tools: SystemTapTechnolog
Page 65 and 66: New Tuning Tools w/ RH MRGMRG Tunin
Page 67 and 68: Tuning how to set kernel paramet
Page 69 and 70: OOM kills - swap space exhaustion(R
Page 71 and 72: OOM kills - lowmem consumption(RHEL
Page 73 and 74: Eliminating OOMkillsRHEL3●/proc/s
Page 75 and 76: Performance Tuning - (RHEL3) /proc/
Page 77 and 78: RHEL3 /proc/sys/vm/pagecachepagecac
Page 79 and 80: Performance Tuning - (RHEL4 and RHE
Page 81 and 82: RHEL4&5 /proc/sys/vm/min_free_kbyte
Page 83 and 84: RHEL4&5 /proc/sys/vm/dirty_ratioAbs
Page 85 and 86: dirty_ratio and dirty_background_ra
Page 87 and 88: Pagecache TuningFilesystem/pagecach
Page 89 and 90: (Hint)flushing the slabcache[tmp]#
Page 91 and 92: x86●RHEL4 kernel selectionStandar
Page 93 and 94: Problem 16GB x86 running SMP ker
Page 95 and 96: Linux at 16cpus quadcore and b
Page 97 and 98: Asynchronous I/O CharacteristicsR4
Page 99 and 100: Disk IO tuning RHEL4/5RHEL4/5 -
Page 101 and 102: Optimizing File System PerformanceU
Page 103 and 104: McCalpin Streams Copy Bandwidth (1,
Page 105 and 106: RHEL4&5 NUMAstat and NUMActlEXAMPLE
Page 107 and 108: RHEL5.2 CPUspeed and performance:En
Page 109 and 110: Effects of CPUspeed with RHEL5.2 Vi
Page 111 and 112:
EXT3, GFS, NFS Iozone w/ DirectIORH
Page 113 and 114:
Using HugeTLBfs w/ DatabasesRHEL4+5
Page 115 and 116:
Tuning Network Apps Messages/sec Di
Page 117 and 118:
RT Peformance of Network Apps Messa
Page 119 and 120:
General Performance Tuning Guidelin
Page 121 and 122:
Linux Performance Tuning References
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RHEL Kernel Performance Optimization, Characterization ... - Red Hat

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