Em uma máquina Debian Linux 3.16, eu tenho 244 MB de espaço de troca usado:
# free -h
total used free shared buffers cached
Mem: 94G 36G 57G 1.9G 3.8G 11G
-/+ buffers/cache: 20G 73G
Swap: 487M 244M 243M
Olhando isso, não consigo encontrar 244 MB usados.
# for file in /proc/*/status ; do grep VmSwap $file; done | sort -nk 2 | tail
VmSwap: 0 kB
VmSwap: 0 kB
VmSwap: 0 kB
VmSwap: 0 kB
VmSwap: 0 kB
VmSwap: 0 kB
VmSwap: 4 kB
VmSwap: 12 kB
VmSwap: 16 kB
VmSwap: 36 kB
E eu tenho apenas 34 MB de SwapCached :
# grep -i swap /proc/meminfo
SwapCached: 34584 kB
SwapTotal: 499708 kB
SwapFree: 249388 kB
O Kernel doc diz sobre isso:
SwapCached: Memory that once was swapped out, is swapped back in but still also is in the swapfile (if memory is needed it doesn't need to be swapped out AGAIN because it is already in the swapfile. This saves I/O)
Como posso saber qual processo está usando meu espaço de troca no meu sistema Linux? Mais precisamente: Onde são consumidos cada um desses 244 MB de swap?
How can I know which process is using my swap space on my Linux system?
O espaço de troca não é necessariamente usado por processos específicos.
More precisely: Where are consumed each of those 244 MB of swap?
Arquivos armazenados em sistemas de arquivos baseados em tmpfs podem estar usando-os ( tmpfs primeiro usa RAM como back-end mas, para não desperdiçar RAM, pode paginar para os blocos da área de swap que não são usados ativamente). / p>
Verifique a saída de:
df -ht tmpfs
The
/proc/PID/smapsis an extension based on maps, showing the memory consumption for each of the process's mappings. For each of mappings there is a series of lines such as the following:08048000-080bc000 r-xp 00000000 03:02 13130 /bin/bash Size: 1084 kB Rss: 892 kB Pss: 374 kB Shared_Clean: 892 kB Shared_Dirty: 0 kB Private_Clean: 0 kB Private_Dirty: 0 kB Referenced: 892 kB Anonymous: 0 kB LazyFree: 0 kB AnonHugePages: 0 kB ShmemPmdMapped: 0 kB Shared_Hugetlb: 0 kB Private_Hugetlb: 0 kB Swap: 0 kB SwapPss: 0 kB KernelPageSize: 4 kB MMUPageSize: 4 kB Locked: 0 kB VmFlags: rd ex mr mw me dw
Tente
$ for proc in /proc/*; do cat $proc/smaps 2>/dev/null | awk '/Swap/{swap+=$2}END{print swap "\tKB\t''readlink $proc/exe|awk '{print $1}' ''" }'; done | sort -n | awk '{total+=$1}/[0-9]/;END{print total "\tKB\tTotal"}'
0 KB /usr/bin/bash
0 KB /usr/bin/bash
0 KB /usr/bin/bash
0 KB /usr/bin/bash
0 KB /usr/bin/bash
0 KB /usr/bin/docker-containerd
0 KB /usr/bin/docker-containerd-shim
0 KB /usr/bin/docker-containerd-shim
0 KB /usr/bin/docker-proxy
0 KB /usr/bin/docker-proxy
0 KB /usr/bin/docker-proxy
0 KB /usr/bin/gawk
0 KB /usr/bin/readlink
0 KB /usr/bin/sleep
0 KB /usr/bin/sort
0 KB /usr/bin/ssh
0 KB /usr/bin/ssh
0 KB /usr/bin/ssh-agent
0 KB /usr/libexec/postfix/pickup
0 KB /usr/libexec/postfix/qmgr
0 KB /usr/sbin/atd
0 KB /usr/sbin/dnsmasq
0 KB /usr/sbin/dnsmasq
0 KB /usr/sbin/sedispatch
0 KB /usr/sbin/sshd
0 KB /usr/sbin/sshd
28 KB /usr/sbin/chronyd
32 KB /usr/sbin/audispd
84 KB /usr/sbin/avahi-daemon
88 KB /usr/lib/systemd/systemd-logind
100 KB /usr/bin/tail
104 KB /usr/sbin/crond
156 KB /usr/sbin/avahi-daemon
192 KB /usr/lib/systemd/systemd-journald
196 KB /usr/bin/bash
196 KB /usr/bin/dbus-launch
...
14872 KB /usr/bin/Xvnc
20048 KB /usr/lib64/firefox/firefox
40176 KB /usr/lib64/firefox/firefox
108848 KB /usr/sbin/mysqld
267144 KB Total
Isso realmente diz que o mysql está usando mais troca.
$ free -k
total used free shared buff/cache available
Mem: 1883740 1044212 112132 14320 727396 520304
Swap: 2097148 265784 1831364
free não parece muito difícil no meu caso
Tags swap linux-kernel