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| [root@cdh85-42 ~]# free -h total used free shared buff/cache available Mem: 502G 34G 1.5G 4.2G 467G 461G Swap: 4.0G 0B 4.0G [root@cdh85-42 ~]# [root@cdh85-42 ~]# [root@cdh85-42 ~]# cat /proc/meminfo MemTotal: 527318720 kB MemFree: 1513916 kB MemAvailable: 483579148 kB Buffers: 28 kB Cached: 472560904 kB SwapCached: 0 kB Active: 249755248 kB Inactive: 254111684 kB Active(anon): 25622464 kB Inactive(anon): 10038512 kB Active(file): 224132784 kB Inactive(file): 244073172 kB Unevictable: 0 kB Mlocked: 0 kB SwapTotal: 4194300 kB SwapFree: 4194300 kB Dirty: 2216 kB Writeback: 64 kB AnonPages: 31309320 kB Mapped: 113004 kB Shmem: 4352956 kB Slab: 17466532 kB SReclaimable: 15190848 kB SUnreclaim: 2275684 kB KernelStack: 38048 kB PageTables: 574580 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 267853660 kB Committed_AS: 313602836 kB VmallocTotal: 34359738367 kB VmallocUsed: 1170752 kB VmallocChunk: 34089979900 kB HardwareCorrupted: 0 kB AnonHugePages: 6144 kB CmaTotal: 0 kB CmaFree: 0 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB DirectMap4k: 372288 kB DirectMap2M: 32319488 kB DirectMap1G: 505413632 kB [root@cdh85-42 ~]#
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https://fivezh.github.io/2017/06/18/centos-7-memory-available/
https://blog.csdn.net/starshine/article/details/7434942
centos 6 7 linux 初始化脚本
https://blog.51cto.com/12445535/2362407
min_free_kbytes 调整 为 50G
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| cat /proc/sys/vm/min_free_kbytes cat /etc/sysctl.conf # add vm.min_free_kbytes = 52428800 sysctl -p cat /proc/sys/vm/min_free_kbytes
[root@cdh85-42 ~]# vim /etc/sysctl.conf ## add vm.min_free_kbytes = 52428800 ## add
[root@cdh85-42 ~]# cat /proc/sys/vm/min_free_kbytes 90112
[root@cdh85-42 ~]# sysctl -p
net.ipv4.tcp_tw_reuse = 1 net.ipv4.tcp_tw_recycle = 1 net.ipv4.tcp_keepalive_time = 1200 net.ipv4.ip_local_port_range = 10000 65000 net.ipv4.tcp_max_syn_backlog = 8192 net.ipv4.tcp_max_tw_buckets = 5000 fs.file-max = 655350 net.ipv4.route.gc_timeout = 100 net.ipv4.tcp_syn_retries = 1 net.ipv4.tcp_synack_retries = 1 net.core.netdev_max_backlog = 16384 net.ipv4.tcp_max_orphans = 16384 net.ipv4.tcp_fin_timeout = 2 net.core.somaxconn = 32768 kernel.threads-max = 196605 kernel.pid_max = 196605 vm.max_map_count = 393210 vm.swappiness = 0 vm.min_free_kbytes = 52428800
[root@cdh85-42 ~]# [root@cdh85-42 ~]# [root@cdh85-42 ~]# free -m total used free shared buff/cache available Mem: 514959 34901 82648 4258 397410 324618 Swap: 4095 0 4095 [root@cdh85-42 ~]# cat /proc/sys/vm/min_free_kbytes 52428800
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