我的台式机系统有 128 GB 的 RAM，这是我最希望的自由的启动 Ubuntu 后。但是，free -m显示已使用 80 GB，只有 40 GB 可用。请注意，buff/cache只有不到 1 GB，因此这不是内存使用率高的原因。
total used free shared buff/cache available
Mem: 125G 80G 44G 20M 825M 42G
Swap: 8G 0B 8G
输出ps aux | awk '{sum+=$6} END {print sum / 1024}'
1368.03
基于另一个问题，这意味着我的进程仅使用 1GB 内存，但整个系统（不包括缓存）使用了 79 GB。
问题：到底是什么占用了我近 80 GB 的内存？启动一个占用约 40 GB 的进程会导致系统崩溃，启动时最初使用的 80 GB 不会被释放！
非常感谢您的见解！
输出ps -A --sort -rss -o comm,pmem | head -n 5
COMMAND %MEM
mysqld 0.2
blueman-applet 0.0
caja 0.0
nm-applet 0.0
输出cat /proc/meminfo
MemTotal: 131947364 kB
MemFree: 45513984 kB
MemAvailable: 45083132 kB
Buffers: 24900 kB
Cached: 299012 kB
SwapCached: 0 kB
Active: 1337380 kB
Inactive: 211000 kB
Active(anon): 1228248 kB
Inactive(anon): 20812 kB
Active(file): 109132 kB
Inactive(file): 190188 kB
Unevictable: 6864 kB
Mlocked: 6900 kB
SwapTotal: 34553848 kB
SwapFree: 34553848 kB
Dirty: 16 kB
Writeback: 0 kB
AnonPages: 1231920 kB
Mapped: 206100 kB
Shmem: 20896 kB
Slab: 521948 kB
SReclaimable: 77492 kB
SUnreclaim: 444456 kB
KernelStack: 20880 kB
PageTables: 23056 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 58584488 kB
Committed_AS: 4713068 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 0 kB
VmallocChunk: 0 kB
HardwareCorrupted: 0 kB
AnonHugePages: 0 kB
ShmemHugePages: 0 kB
ShmemPmdMapped: 0 kB
CmaTotal: 0 kB
CmaFree: 0 kB
HugePages_Total: 40960
HugePages_Free: 40960
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 390128 kB
DirectMap2M: 8921088 kB
DirectMap1G: 124780544 kB
输出sudo lshw -C memory
*-firmware
description: BIOS
vendor: American Megatrends Inc.
physical id: 0
version: P3.50
date: 12/24/2018
size: 64KiB
capacity: 15MiB
capabilities: pci upgrade shadowing cdboot bootselect socketedrom edd int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard int14serial int17printer acpi usb biosbootspecification uefi
*-memory
description: System Memory
physical id: 8
slot: System board or motherboard
size: 128GiB
*-bank:0
description: DIMM Synchronous 2134 MHz (0.5 ns)
product: CMK128GX4M8X3800C19
vendor: Unknown
physical id: 0
serial: 00000000
slot: DIMM 0
size: 16GiB
width: 64 bits
clock: 2134MHz (0.5ns)
*-bank:1
description: DIMM Synchronous 2134 MHz (0.5 ns)
product: CMK128GX4M8X3800C19
vendor: Unknown
physical id: 1
serial: 00000000
slot: DIMM 1
size: 16GiB
width: 64 bits
clock: 2134MHz (0.5ns)
*-bank:2
description: DIMM Synchronous 2134 MHz (0.5 ns)
product: CMK128GX4M8X3800C19
vendor: Unknown
physical id: 2
serial: 00000000
slot: DIMM 0
size: 16GiB
width: 64 bits
clock: 2134MHz (0.5ns)
*-bank:3
description: DIMM Synchronous 2134 MHz (0.5 ns)
product: CMK128GX4M8X3800C19
vendor: Unknown
physical id: 3
serial: 00000000
slot: DIMM 1
size: 16GiB
width: 64 bits
clock: 2134MHz (0.5ns)
*-bank:4
description: DIMM Synchronous 2134 MHz (0.5 ns)
product: CMK128GX4M8X3800C19
vendor: Unknown
physical id: 4
serial: 00000000
slot: DIMM 0
size: 16GiB
width: 64 bits
clock: 2134MHz (0.5ns)
*-bank:5
description: DIMM Synchronous 2134 MHz (0.5 ns)
product: CMK128GX4M8X3800C19
vendor: Unknown
physical id: 5
serial: 00000000
slot: DIMM 1
size: 16GiB
width: 64 bits
clock: 2134MHz (0.5ns)
*-bank:6
description: DIMM Synchronous 2134 MHz (0.5 ns)
product: CMK128GX4M8X3800C19
vendor: Unknown
physical id: 6
serial: 00000000
slot: DIMM 0
size: 16GiB
width: 64 bits
clock: 2134MHz (0.5ns)
*-bank:7
description: DIMM Synchronous 2134 MHz (0.5 ns)
product: CMK128GX4M8X3800C19
vendor: Unknown
physical id: 7
serial: 00000000
slot: DIMM 1
size: 16GiB
width: 64 bits
clock: 2134MHz (0.5ns)
*-cache:0
description: L1 cache
physical id: b
slot: L1 - Cache
size: 3MiB
capacity: 3MiB
clock: 1GHz (1.0ns)
capabilities: pipeline-burst internal write-back unified
configuration: level=1
*-cache:1
description: L2 cache
physical id: c
slot: L2 - Cache
size: 16MiB
capacity: 16MiB
clock: 1GHz (1.0ns)
capabilities: pipeline-burst internal write-back unified
configuration: level=2
*-cache:2
description: L3 cache
physical id: d
slot: L3 - Cache
size: 64MiB
capacity: 64MiB
clock: 1GHz (1.0ns)
capabilities: pipeline-burst internal write-back unified
configuration: level=3
输出sudo grep Memory /var/log/kern.log | grep reserved
Jan 14 16:53:53 server2 kernel: [ 0.000000] Memory: 131807432K/134091364K available (12300K kernel code, 2480K rwdata, 4208K rodata, 2428K init, 2704K bss, 2283932K reserved, 0K cma-reserved)
Jan 14 17:47:08 server2 kernel: [ 0.000000] Memory: 131807432K/134091364K available (12300K kernel code, 2480K rwdata, 4208K rodata, 2428K init, 2704K bss, 2283932K reserved, 0K cma-reserved)
Jan 14 17:52:04 server2 kernel: [ 0.000000] Memory: 131807436K/134091364K available (12300K kernel code, 2480K rwdata, 4208K rodata, 2428K init, 2704K bss, 2283928K reserved, 0K cma-reserved)
Jan 14 18:09:33 server2 kernel: [ 0.000000] Memory: 131807436K/134091364K available (12300K kernel code, 2480K rwdata, 4208K rodata, 2428K init, 2704K bss, 2283928K reserved, 0K cma-reserved)
Jan 14 18:25:01 server2 kernel: [ 0.000000] Memory: 131807436K/134091364K available (12300K kernel code, 2480K rwdata, 4208K rodata, 2428K init, 2704K bss, 2283928K reserved, 0K cma-reserved)
Jan 14 18:43:40 server2 kernel: [ 0.000000] Memory: 131820396K/134091364K available (12300K kernel code, 2480K rwdata, 4208K rodata, 2428K init, 2704K bss, 2270968K reserved, 0K cma-reserved)
Jan 14 18:48:07 server2 kernel: [ 0.000000] Memory: 131807428K/134091364K available (12300K kernel code, 2480K rwdata, 4208K rodata, 2428K init, 2704K bss, 2283936K reserved, 0K cma-reserved)
答案1
部分答案...
CPU: AMD Threadripper 2990WX
Motherboard: ASRock X399 Professional Gaming sTR4
128GB of RAM
更新主板 BIOS
- 您当前处于 BIOS 版本 P3.50
- 自 2020 年 1 月 8 日起，BIOS 3.80 可供下载这里
- 确认这是适合您型号的正确网页#
- 安装新 BIOS 前备份重要数据
- 查看
free -h命令确认内存使用情况
去https://www.memtest86.com/并下载/运行他们的免费记忆测试来测试你的记忆力。至少完成一次所有 4/4 测试以确认记忆力良好。这可能需要几个小时才能完成。
使用正确的 ESD 和电源程序，将所有 RAM DIMM 重新放入其插槽中。（等我告诉你更多有关此事的信息后再做这件事。）