Performance Analysis and Tuning â Part 1 - Red Hat Summit
Performance Analysis and Tuning â Part 1 - Red Hat Summit Performance Analysis and Tuning â Part 1 - Red Hat Summit
So, what's the NUMA problem?●●●The Linux system scheduler is very good atmaintaining responsiveness and optimizing for CPUutilizationTries to use idle CPUs, regardless of where processmemory is located.... Using remote memory degradesperformance!●Red Hat is working with the upstream community to increaseNUMA awareness of the scheduler and to implementautomatic NUMA balancing.Remote memory latency matters most for longrunning,significant processes, e.g., HPTC, VMs, etc.
Use numastat to see memory layout●●●●Rewritten for Red Hat Enterprise Linux 6.4 to showper-node system and process memory information100% compatible with prior version by default,displaying /sys...node/numastat memory allocationstatisticsAny command options invoke new functionality●●-m for per-node system memory info for per-node process memory infoSee numastat(8)
- Page 2 and 3: Performance Analysis andTuning - Pa
- Page 4 and 5: Red Hat Enterprise Linux: Scale Up
- Page 6 and 7: Red Hat Enterprise Linux 6Benchmark
- Page 8 and 9: Red Hat Enterprise Linux 6.4 vs Win
- Page 10 and 11: Red Hat Enterprise Linux 6Scheduler
- Page 12 and 13: Load Balancing●●●●●Schedu
- Page 14 and 15: sched_child_runs_first●●●fork
- Page 16 and 17: 2MB standard Hugepages# echo 2000 >
- Page 18 and 19: Transparent Hugepagesecho never > /
- Page 20 and 21: 32-bitMemory Zones64-bitUp to 64 GB
- Page 22 and 23: Per Node/Zone split LRU Paging Dyna
- Page 24 and 25: Typical System Building BlockMemory
- Page 26 and 27: Four NUMA node system,fully-connect
- Page 28 and 29: Per NUMA-Node ResourcesMemory zones
- Page 30 and 31: zone_reclaim_mode●●●●Contro
- Page 32 and 33: Visualize CPUs via lstopo(from hwlo
- Page 34 and 35: Sample remote access latencies4 soc
- Page 38 and 39: numastat: compatibility mode# numas
- Page 40 and 41: numastat: per-node meminfo# numasta
- Page 42 and 43: numastat shows aligned guests# numa
- Page 44 and 45: How to manage NUMA manually●●
- Page 46 and 47: numad can help improve NUMA perform
- Page 48 and 49: numad aligns process memory and CPU
- Page 50 and 51: numad usage●●●●numad is int
- Page 52 and 53: To change utilization target● -u
- Page 54 and 55: To get pre-placement advice● -w :
- Page 56 and 57: numad “-w” shell script(the imp
- Page 58 and 59: numad “-w” shell script (advise
- Page 60 and 61: Multiguest Oracle OLTP WorkloadOrac
- Page 62 and 63: Summary / Questions●Red Hat Enter
- Page 64 and 65: Cgroup default mount points# cat /e
- Page 66 and 67: cgroups[root@dhcp1001950 ~]#
- Page 68 and 69: incorrect bindings!# echo 1 > cpuse
Use numastat to see memory layout●●●●Rewritten for <strong>Red</strong> <strong>Hat</strong> Enterprise Linux 6.4 to showper-node system <strong>and</strong> process memory information100% compatible with prior version by default,displaying /sys...node/numastat memory allocationstatisticsAny comm<strong>and</strong> options invoke new functionality●●-m for per-node system memory info for per-node process memory infoSee numastat(8)
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