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

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<strong>RHEL</strong>4&5 NUMAstat and NUMActlNUMAstat to display system NUMA characteristics on a numasystem[root@perf5 ~]# numastatnode3 node2 node1 node0numa_hit 72684 82215 157244 325444numa_miss 0 0 0 0numa_foreign 0 0 0 0interleave_hit 2668 2431 2763 2699local_node 67306 77456 152115 324733other_node 5378 4759 5129 711NUMActl to control process and memory”TIPnumactl [ interleave nodes ] [ preferred node ] [ membind nodes ][ cpubind nodes ] [ localalloc ] command {arguments ...}●App < memory single NUMA zone●Numactl use –cpubind cpus within same socket●App > memory of a single NUMA zone●Numactl –interleave XY and –cpubind XY
<strong>RHEL</strong>4&5 NUMAstat and NUMActlEXAMPLESnumactl interleave=all bigdatabase arguments Run big database withits memory interleaved on all CPUs.numactl cpubind=0membind=0,1 process Run process on node 0 withmemory allocated on node 0 and 1.numactl preferred=1 numactl show Set preferred node 1 and show theresulting state.numactl interleave=all shmkeyfile /tmp/shmkey Interleave all of thesysv shared memory regiion specified by /tmp/shmkey over all nodes.numactl offset=1G length=1G membind=1 file /dev/shm/A touchBind the second gigabyte in the tmpfs file /dev/shm/A to node 1.numactl localalloc /dev/shm/file Reset the policy for the shared memoryfile file to the default localalloc policy.
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RHEL Kernel Performance Optimizatio
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Section 1 System Overview Proces
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Processor typesUniProcessorSymmet
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AMD64 System Numa Memory LayoutS1S2
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Physical Memory Supported/TestedRHE
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IncomesExpendituresDonkey owned 0.7
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Perzone page lists Active List
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Per NUMANode ResourcesMemory zone
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Virtual Address Space Maps 32bit
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Linux 32bit Address Space(Hugemem
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Memory Pressure32 bitDMA Normal H
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User Memory PressureAnonymous/pagec
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PageCache/Anonymous memory split(Co
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64bit Memory ReclamationRAMKernel
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Per Node/Zone Paging DynamicsUser A
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Buffered file system writeMemorycop
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Section 2 Analyzing System Perfo
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Red Hat Top ToolsCPU ToolsMemory To
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vmstat(paging vs swapping)vmstat 10
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iostat x of same IOzone EXT3 file
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free/numastat - memory allocation[r
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pstreeinit ─┬─/usr/bin/sealer
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The /proc filesystem /proc●meminf
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proc/slabinfoslabinfo version: 2
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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 and 60: Alt Sysrq W and PSysRq : Show CPUsC
Page 61 and 62: oprofile - opcontrol and opreport c
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: McCalpin Streams Copy Bandwidth (1,
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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