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KVM宿主机占用缓存较大,hcache可能无法定位? #3
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我也碰到了类似的问题。宿主机free看cache占用很大。但是用hcache得到的cache缺很小。 |
是的,因为用-top参数看到的是当前进程正在打开的文件,如果这个文件已经被缓存了但是进程并没有访问是看不到的,只能通过指定文件查看是否被缓存在页面中,看不了cache中全部的内容 |
操作系统可能缓存了大量文件,但之前访问的进程可能都结束了,这时就会出现这种现象。 |
进程打开的文件在 /proc/{pid}/fd 中可以看到的,不是在 /proc/{pid}/maps 里看。为什么不从 fd 目录这里取呢。 |
可以贡献一个 MR |
提了一个 PR:#41 |
1、服务器为KVM宿主机,启动了多个KVM虚拟机。
free -h
total used free shared buff/cache available
Mem: 251G 67G 770M 4.1G 183G 179G
Swap: 0B 0B 0B
2、 以下是./hcache --top 10 ,但是缓存占用在183G,其中是不是有其他比较大的文件缓存,但是通过hcache无法确认?有没有办法确认cache中的内容,谢谢。
3、/proc/meminfo信息
MemTotal: 263566160 kB
MemFree: 2093520 kB
MemAvailable: 169410064 kB
Buffers: 0 kB
Cached: 168794964 kB
SwapCached: 604572 kB
Active: 160983136 kB
Inactive: 94351416 kB
Active(anon): 78603948 kB
Inactive(anon): 8031548 kB
Active(file): 82379188 kB
Inactive(file): 86319868 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 15204348 kB
SwapFree: 13583428 kB
Dirty: 20 kB
Writeback: 0 kB
AnonPages: 85955084 kB
Mapped: 63308 kB
Shmem: 95256 kB
Slab: 4086124 kB
SReclaimable: 3335448 kB
SUnreclaim: 750676 kB
KernelStack: 9584 kB
PageTables: 181892 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 146987428 kB
Committed_AS: 90918056 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 901844 kB
VmallocChunk: 34224481256 kB
HardwareCorrupted: 0 kB
AnonHugePages: 79038464 kB
CmaTotal: 0 kB
CmaFree: 0 kB
HugePages_Total: 0
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