Low free swap but nothing uses it
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We've PostgreSQL 10.3 running on 7.4.1708.
Yesterday, suddenly something claimed swap space about 2.2GB.
I could find only few process and restarted them only got about 200MB.
I've dropped pagecache and set vm.swappiness to 0
But swap did not drop.
I've searched what claimed swap but I could not find.
- free says, 2025MB swap is claimed
- top says nothing claimed swap
- smem says nothing claimed swap
root@server# free -m
total used free shared buff/cache available
Mem: 1031502 9793 308314 201749 713394 812428
Swap: 4095 2025 2070
root@server#smem -s swap
178243 root python /bin/smem -s swap 0 6184 6682 10120
1 root /usr/lib/systemd/systemd -- 8 16632 17267 20720
7929 root /usr/lib/systemd/systemd-jo 108 12624 52410 94280
root@server#top -o SWAP
PID USER PR NI VIRT RES SHR SWAP S %CPU %MEM TIME+
7929 root 20 0 144380 94436 94148 108 S 0.0 0.0 29:32.52
1 root 20 0 206152 20720 5480 8 S 0.0 0.0 61:07.68
2 root 20 0 0 0 0 0 S 0.0 0.0 0:22.39
I don't want to swapoff and swapon. Because this is our primary db server, I've heard swapoff could make system unstable.
What should I do, how can I find which process claimed that swap space?
linux postgresql swap
asked Feb 9 at 21:32
Yavuz SelimYavuz Selim
13
add a comment |
We've PostgreSQL 10.3 running on 7.4.1708.
Yesterday, suddenly something claimed swap space about 2.2GB.
I could find only few process and restarted them only got about 200MB.
I've dropped pagecache and set vm.swappiness to 0
But swap did not drop.
I've searched what claimed swap but I could not find.
- free says, 2025MB swap is claimed
- top says nothing claimed swap
- smem says nothing claimed swap
root@server# free -m
total used free shared buff/cache available
Mem: 1031502 9793 308314 201749 713394 812428
Swap: 4095 2025 2070
root@server#smem -s swap
178243 root python /bin/smem -s swap 0 6184 6682 10120
1 root /usr/lib/systemd/systemd -- 8 16632 17267 20720
7929 root /usr/lib/systemd/systemd-jo 108 12624 52410 94280
root@server#top -o SWAP
PID USER PR NI VIRT RES SHR SWAP S %CPU %MEM TIME+
7929 root 20 0 144380 94436 94148 108 S 0.0 0.0 29:32.52
1 root 20 0 206152 20720 5480 8 S 0.0 0.0 61:07.68
2 root 20 0 0 0 0 0 S 0.0 0.0 0:22.39
I don't want to swapoff and swapon. Because this is our primary db server, I've heard swapoff could make system unstable.
What should I do, how can I find which process claimed that swap space?
linux postgresql swap
asked Feb 9 at 21:32
Yavuz SelimYavuz Selim
13
Possibly related answer here : stackoverflow.com/questions/479953/…
– Christopher Hostage
Feb 22 at 17:07
I saw that link you sent and I've already looked at swap usage per process with smem and top. But no process showed up. I post this because of that.
– Yavuz Selim
Feb 22 at 17:12
add a comment |
We've PostgreSQL 10.3 running on 7.4.1708.
Yesterday, suddenly something claimed swap space about 2.2GB.
I could find only few process and restarted them only got about 200MB.
I've dropped pagecache and set vm.swappiness to 0
But swap did not drop.
I've searched what claimed swap but I could not find.
- free says, 2025MB swap is claimed
- top says nothing claimed swap
- smem says nothing claimed swap
root@server# free -m
total used free shared buff/cache available
Mem: 1031502 9793 308314 201749 713394 812428
Swap: 4095 2025 2070
root@server#smem -s swap
178243 root python /bin/smem -s swap 0 6184 6682 10120
1 root /usr/lib/systemd/systemd -- 8 16632 17267 20720
7929 root /usr/lib/systemd/systemd-jo 108 12624 52410 94280
root@server#top -o SWAP
PID USER PR NI VIRT RES SHR SWAP S %CPU %MEM TIME+
7929 root 20 0 144380 94436 94148 108 S 0.0 0.0 29:32.52
1 root 20 0 206152 20720 5480 8 S 0.0 0.0 61:07.68
2 root 20 0 0 0 0 0 S 0.0 0.0 0:22.39
I don't want to swapoff and swapon. Because this is our primary db server, I've heard swapoff could make system unstable.
What should I do, how can I find which process claimed that swap space?
linux postgresql swap
asked Feb 9 at 21:32
Yavuz SelimYavuz Selim
13
We've PostgreSQL 10.3 running on 7.4.1708.
Yesterday, suddenly something claimed swap space about 2.2GB.
I could find only few process and restarted them only got about 200MB.
I've dropped pagecache and set vm.swappiness to 0
But swap did not drop.
I've searched what claimed swap but I could not find.
- free says, 2025MB swap is claimed
- top says nothing claimed swap
- smem says nothing claimed swap
root@server# free -m
total used free shared buff/cache available
Mem: 1031502 9793 308314 201749 713394 812428
Swap: 4095 2025 2070
root@server#smem -s swap
178243 root python /bin/smem -s swap 0 6184 6682 10120
1 root /usr/lib/systemd/systemd -- 8 16632 17267 20720
7929 root /usr/lib/systemd/systemd-jo 108 12624 52410 94280
root@server#top -o SWAP
PID USER PR NI VIRT RES SHR SWAP S %CPU %MEM TIME+
7929 root 20 0 144380 94436 94148 108 S 0.0 0.0 29:32.52
1 root 20 0 206152 20720 5480 8 S 0.0 0.0 61:07.68
2 root 20 0 0 0 0 0 S 0.0 0.0 0:22.39
I don't want to swapoff and swapon. Because this is our primary db server, I've heard swapoff could make system unstable.
What should I do, how can I find which process claimed that swap space?
linux postgresql swap
linux postgresql swap
asked Feb 9 at 21:32
Yavuz SelimYavuz Selim
13
asked Feb 9 at 21:32
Yavuz SelimYavuz Selim
13
edited Feb 22 at 14:52
Yavuz Selim
asked Feb 9 at 21:32
Yavuz SelimYavuz Selim
13
asked Feb 9 at 21:32
Yavuz SelimYavuz Selim
13
asked Feb 9 at 21:32
Yavuz SelimYavuz Selim
13
13
Possibly related answer here : stackoverflow.com/questions/479953/…
– Christopher Hostage
Feb 22 at 17:07
I saw that link you sent and I've already looked at swap usage per process with smem and top. But no process showed up. I post this because of that.
– Yavuz Selim
Feb 22 at 17:12
add a comment |
Possibly related answer here : stackoverflow.com/questions/479953/…
– Christopher Hostage
Feb 22 at 17:07
I saw that link you sent and I've already looked at swap usage per process with smem and top. But no process showed up. I post this because of that.
– Yavuz Selim
Feb 22 at 17:12
Possibly related answer here : stackoverflow.com/questions/479953/…
– Christopher Hostage
Feb 22 at 17:07
Possibly related answer here : stackoverflow.com/questions/479953/…
– Christopher Hostage
Feb 22 at 17:07
I saw that link you sent and I've already looked at swap usage per process with smem and top. But no process showed up. I post this because of that.
– Yavuz Selim
Feb 22 at 17:12
I saw that link you sent and I've already looked at swap usage per process with smem and top. But no process showed up. I post this because of that.
– Yavuz Selim
Feb 22 at 17:12
add a comment |
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Possibly related answer here : stackoverflow.com/questions/479953/…
– Christopher Hostage
Feb 22 at 17:07
I saw that link you sent and I've already looked at swap usage per process with smem and top. But no process showed up. I post this because of that.
– Yavuz Selim
Feb 22 at 17:12