55 lines
1.9 KiB
Text
55 lines
1.9 KiB
Text
#
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# tuned configuration for PostgreSQL servers
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#
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[main]
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summary=Optimize for PostgreSQL server
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include=throughput-performance
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[cpu]
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# The alternation of CPU bound load and disk IO operations of postgresql
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# db server suggest CPU to go into powersave mode.
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#
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# Explicitly disable deep c-states to reduce latency on OLTP workloads.
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force_latency=1
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[vm]
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transparent_hugepages=never
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# The dirty_background_ratio and dirty_ratio controls percentage of memory
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# that file system cache have to fill with dirty data before kernel will
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# will start to flush data to disks. The default values are 10% and 20%
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# accordingly. On a systems with a big amount of memory this values can
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# be tens of gigabytes and produce IO spikes when PostgreSQL server writes
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# checkpoints. The values can alternatively be set in absolute number of bytes
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# via dirty_background_bytes and dirty_bytes.
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#
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# Keep this values reasonable small - about size of RAID controller write-back
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# cache size (typcal 512MB - 2GB).
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dirty_background_bytes = 67108864
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dirty_bytes = 536870912
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[sysctl]
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# The swappiness parameter controls the tendency of the kernel to move
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# processes out of physical memory and onto the swap disk.
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# 0 tells the kernel to avoid swapping processes out of physical memory
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# for as long as possible
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# 100 tells the kernel to aggressively swap processes out of physical memory
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# and move them to swap cache
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vm.swappiness=3
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# The autogroup feature of the CFS
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# (system default is 1, e.q enabled)
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kernel.sched_autogroup_enabled = 0
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[scheduler]
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# ktune sysctl settings for rhel6 servers, maximizing i/o throughput
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#
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# Minimal preemption granularity for CPU-bound tasks:
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# (default: 1 msec# (1 + ilog(ncpus)), units: nanoseconds)
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sched_min_granularity_ns = 10000000
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# The total time the scheduler will consider a migrated process
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# "cache hot" and thus less likely to be re-migrated
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# (system default is 500000, i.e. 0.5 ms)
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sched_migration_cost_ns = 50000000
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