how disable use swap partition by processes , only if its really need
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My embedded system has 2 GB RAM and 100 MB swap partition.
I recognize, after continues monitoring that average memory usage of RAM is ~50 %.
For some reason system start use SWAP memory and use almost 40 % of it (40 MB).
I want prevent such thing because my device flash has a big problem with number of writes and I need it for ~10 years of use.
After run these set of commands I get to list of processes that use SWAP :
for file in /proc/*/status ; do awk '/VmSwap|Name/printf $2 " " $3END print ""' $file; done | sort -k 2 -n -r | less​
My system file /etc/sysctl.conf confiured with parameter : vm.swappiness=1 , so according articles I read it should use SWAP only if it really need.
(I investigated the results with vm.sappiness=0, but didn't have results yet.)
I know that there is a way to prevent from specific processes use swap, but what is a correct one?
linux swap process-management
edited Nov 6 '17 at 14:52
ilkkachu
50.5k677138
asked Nov 6 '17 at 14:31
Sergey Meerovich
263
add a comment |Â
up vote
1
down vote
favorite
My embedded system has 2 GB RAM and 100 MB swap partition.
I recognize, after continues monitoring that average memory usage of RAM is ~50 %.
For some reason system start use SWAP memory and use almost 40 % of it (40 MB).
I want prevent such thing because my device flash has a big problem with number of writes and I need it for ~10 years of use.
After run these set of commands I get to list of processes that use SWAP :
for file in /proc/*/status ; do awk '/VmSwap|Name/printf $2 " " $3END print ""' $file; done | sort -k 2 -n -r | less​
My system file /etc/sysctl.conf confiured with parameter : vm.swappiness=1 , so according articles I read it should use SWAP only if it really need.
(I investigated the results with vm.sappiness=0, but didn't have results yet.)
I know that there is a way to prevent from specific processes use swap, but what is a correct one?
linux swap process-management
edited Nov 6 '17 at 14:52
ilkkachu
50.5k677138
asked Nov 6 '17 at 14:31
Sergey Meerovich
263
This doesn't answer your question, but with that setup, do you need the swap in the first place? 100 MB isn't that much on a 2 GB machine, so you could probably do without it, and avoid this issue too. Also, the amount of swap in use at one time doesn't tell how much writes go to the swap: some rarely-if-ever used data might end up in swap the first the memory is full, and if it's never modified, there are no further writes.
– ilkkachu
Nov 6 '17 at 14:56
This sounds like a job for thenicefamily... ionice nice renice
– RubberStamp
Nov 6 '17 at 15:03
You may also want to decrease verbosity level of logs in rsyslog configuration.
– Jaroslav Kucera
Nov 6 '17 at 15:36
my system is embedded base very shrink Debian 8 based system , that has problem with number of writes/read per-block on his flash drive, but it run an application that use pretty more resources. This is a reason why we declare swap partition if system get to critical point it will use swap partition.
– Sergey Meerovich
Nov 7 '17 at 12:15
add a comment |Â
up vote
1
down vote
favorite
up vote
1
down vote
favorite
My embedded system has 2 GB RAM and 100 MB swap partition.
I recognize, after continues monitoring that average memory usage of RAM is ~50 %.
For some reason system start use SWAP memory and use almost 40 % of it (40 MB).
I want prevent such thing because my device flash has a big problem with number of writes and I need it for ~10 years of use.
After run these set of commands I get to list of processes that use SWAP :
for file in /proc/*/status ; do awk '/VmSwap|Name/printf $2 " " $3END print ""' $file; done | sort -k 2 -n -r | less​
My system file /etc/sysctl.conf confiured with parameter : vm.swappiness=1 , so according articles I read it should use SWAP only if it really need.
(I investigated the results with vm.sappiness=0, but didn't have results yet.)
I know that there is a way to prevent from specific processes use swap, but what is a correct one?
linux swap process-management
edited Nov 6 '17 at 14:52
ilkkachu
50.5k677138
asked Nov 6 '17 at 14:31
Sergey Meerovich
263
My embedded system has 2 GB RAM and 100 MB swap partition.
I recognize, after continues monitoring that average memory usage of RAM is ~50 %.
For some reason system start use SWAP memory and use almost 40 % of it (40 MB).
I want prevent such thing because my device flash has a big problem with number of writes and I need it for ~10 years of use.
After run these set of commands I get to list of processes that use SWAP :
for file in /proc/*/status ; do awk '/VmSwap|Name/printf $2 " " $3END print ""' $file; done | sort -k 2 -n -r | less​
My system file /etc/sysctl.conf confiured with parameter : vm.swappiness=1 , so according articles I read it should use SWAP only if it really need.
(I investigated the results with vm.sappiness=0, but didn't have results yet.)
I know that there is a way to prevent from specific processes use swap, but what is a correct one?
linux swap process-management
edited Nov 6 '17 at 14:52
ilkkachu
50.5k677138
asked Nov 6 '17 at 14:31
Sergey Meerovich
263
edited Nov 6 '17 at 14:52
ilkkachu
50.5k677138
edited Nov 6 '17 at 14:52
ilkkachu
50.5k677138
edited Nov 6 '17 at 14:52
ilkkachu
50.5k677138
50.5k677138
asked Nov 6 '17 at 14:31
Sergey Meerovich
263
asked Nov 6 '17 at 14:31
Sergey Meerovich
263
asked Nov 6 '17 at 14:31
Sergey Meerovich
263
263
This doesn't answer your question, but with that setup, do you need the swap in the first place? 100 MB isn't that much on a 2 GB machine, so you could probably do without it, and avoid this issue too. Also, the amount of swap in use at one time doesn't tell how much writes go to the swap: some rarely-if-ever used data might end up in swap the first the memory is full, and if it's never modified, there are no further writes.
– ilkkachu
Nov 6 '17 at 14:56
This sounds like a job for thenicefamily... ionice nice renice
– RubberStamp
Nov 6 '17 at 15:03
You may also want to decrease verbosity level of logs in rsyslog configuration.
– Jaroslav Kucera
Nov 6 '17 at 15:36
my system is embedded base very shrink Debian 8 based system , that has problem with number of writes/read per-block on his flash drive, but it run an application that use pretty more resources. This is a reason why we declare swap partition if system get to critical point it will use swap partition.
– Sergey Meerovich
Nov 7 '17 at 12:15
add a comment |Â
This doesn't answer your question, but with that setup, do you need the swap in the first place? 100 MB isn't that much on a 2 GB machine, so you could probably do without it, and avoid this issue too. Also, the amount of swap in use at one time doesn't tell how much writes go to the swap: some rarely-if-ever used data might end up in swap the first the memory is full, and if it's never modified, there are no further writes.
– ilkkachu
Nov 6 '17 at 14:56
This sounds like a job for thenicefamily... ionice nice renice
– RubberStamp
Nov 6 '17 at 15:03
You may also want to decrease verbosity level of logs in rsyslog configuration.
– Jaroslav Kucera
Nov 6 '17 at 15:36
my system is embedded base very shrink Debian 8 based system , that has problem with number of writes/read per-block on his flash drive, but it run an application that use pretty more resources. This is a reason why we declare swap partition if system get to critical point it will use swap partition.
– Sergey Meerovich
Nov 7 '17 at 12:15
This doesn't answer your question, but with that setup, do you need the swap in the first place? 100 MB isn't that much on a 2 GB machine, so you could probably do without it, and avoid this issue too. Also, the amount of swap in use at one time doesn't tell how much writes go to the swap: some rarely-if-ever used data might end up in swap the first the memory is full, and if it's never modified, there are no further writes.
– ilkkachu
Nov 6 '17 at 14:56
This doesn't answer your question, but with that setup, do you need the swap in the first place? 100 MB isn't that much on a 2 GB machine, so you could probably do without it, and avoid this issue too. Also, the amount of swap in use at one time doesn't tell how much writes go to the swap: some rarely-if-ever used data might end up in swap the first the memory is full, and if it's never modified, there are no further writes.
– ilkkachu
Nov 6 '17 at 14:56
This sounds like a job for the
nice family... ionice nice renice– RubberStamp
Nov 6 '17 at 15:03
This sounds like a job for the
nice family... ionice nice renice– RubberStamp
Nov 6 '17 at 15:03
You may also want to decrease verbosity level of logs in rsyslog configuration.
– Jaroslav Kucera
Nov 6 '17 at 15:36
You may also want to decrease verbosity level of logs in rsyslog configuration.
– Jaroslav Kucera
Nov 6 '17 at 15:36
my system is embedded base very shrink Debian 8 based system , that has problem with number of writes/read per-block on his flash drive, but it run an application that use pretty more resources. This is a reason why we declare swap partition if system get to critical point it will use swap partition.
– Sergey Meerovich
Nov 7 '17 at 12:15
my system is embedded base very shrink Debian 8 based system , that has problem with number of writes/read per-block on his flash drive, but it run an application that use pretty more resources. This is a reason why we declare swap partition if system get to critical point it will use swap partition.
– Sergey Meerovich
Nov 7 '17 at 12:15
add a comment |Â
2 Answers
2
active
oldest
votes
up vote
4
down vote
You can set swappiness per process with cgroups
echo 0 > /sys/fs/cgroup/<your custom group>/memory.swappiness
Anyway my advice is to use zram for compressed swapping in ram.
answered Nov 6 '17 at 15:13
Ipor Sircer
8,8921920
Just to add, this can also be achieved with the libcgroup and the cgset command.
– Raman Sailopal
Nov 6 '17 at 15:28
add a comment |Â
up vote
0
down vote
I test on two systems , where I detect previously use of 40% of SWAP option of :
vm.swappiness=0
This option really helped . I didn't see any use of swap for last 4 days
answered Nov 10 '17 at 8:11
Sergey Meerovich
263
add a comment |Â
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
4
down vote
You can set swappiness per process with cgroups
echo 0 > /sys/fs/cgroup/<your custom group>/memory.swappiness
Anyway my advice is to use zram for compressed swapping in ram.
answered Nov 6 '17 at 15:13
Ipor Sircer
8,8921920
Just to add, this can also be achieved with the libcgroup and the cgset command.
– Raman Sailopal
Nov 6 '17 at 15:28
add a comment |Â
up vote
4
down vote
You can set swappiness per process with cgroups
echo 0 > /sys/fs/cgroup/<your custom group>/memory.swappiness
Anyway my advice is to use zram for compressed swapping in ram.
answered Nov 6 '17 at 15:13
Ipor Sircer
8,8921920
Just to add, this can also be achieved with the libcgroup and the cgset command.
– Raman Sailopal
Nov 6 '17 at 15:28
add a comment |Â
up vote
4
down vote
up vote
4
down vote
You can set swappiness per process with cgroups
echo 0 > /sys/fs/cgroup/<your custom group>/memory.swappiness
Anyway my advice is to use zram for compressed swapping in ram.
answered Nov 6 '17 at 15:13
Ipor Sircer
8,8921920
You can set swappiness per process with cgroups
echo 0 > /sys/fs/cgroup/<your custom group>/memory.swappiness
Anyway my advice is to use zram for compressed swapping in ram.
answered Nov 6 '17 at 15:13
Ipor Sircer
8,8921920
edited Nov 6 '17 at 15:20
answered Nov 6 '17 at 15:13
Ipor Sircer
8,8921920
answered Nov 6 '17 at 15:13
Ipor Sircer
8,8921920
answered Nov 6 '17 at 15:13
Ipor Sircer
8,8921920
8,8921920
Just to add, this can also be achieved with the libcgroup and the cgset command.
– Raman Sailopal
Nov 6 '17 at 15:28
add a comment |Â
Just to add, this can also be achieved with the libcgroup and the cgset command.
– Raman Sailopal
Nov 6 '17 at 15:28
Just to add, this can also be achieved with the libcgroup and the cgset command.
– Raman Sailopal
Nov 6 '17 at 15:28
Just to add, this can also be achieved with the libcgroup and the cgset command.
– Raman Sailopal
Nov 6 '17 at 15:28
add a comment |Â
up vote
0
down vote
I test on two systems , where I detect previously use of 40% of SWAP option of :
vm.swappiness=0
This option really helped . I didn't see any use of swap for last 4 days
answered Nov 10 '17 at 8:11
Sergey Meerovich
263
add a comment |Â
up vote
0
down vote
I test on two systems , where I detect previously use of 40% of SWAP option of :
vm.swappiness=0
This option really helped . I didn't see any use of swap for last 4 days
answered Nov 10 '17 at 8:11
Sergey Meerovich
263
add a comment |Â
up vote
0
down vote
up vote
0
down vote
I test on two systems , where I detect previously use of 40% of SWAP option of :
vm.swappiness=0
This option really helped . I didn't see any use of swap for last 4 days
answered Nov 10 '17 at 8:11
Sergey Meerovich
263
I test on two systems , where I detect previously use of 40% of SWAP option of :
vm.swappiness=0
This option really helped . I didn't see any use of swap for last 4 days
answered Nov 10 '17 at 8:11
Sergey Meerovich
263
answered Nov 10 '17 at 8:11
Sergey Meerovich
263
answered Nov 10 '17 at 8:11
Sergey Meerovich
263
answered Nov 10 '17 at 8:11
Sergey Meerovich
263
263
add a comment |Â
add a comment |Â
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This doesn't answer your question, but with that setup, do you need the swap in the first place? 100 MB isn't that much on a 2 GB machine, so you could probably do without it, and avoid this issue too. Also, the amount of swap in use at one time doesn't tell how much writes go to the swap: some rarely-if-ever used data might end up in swap the first the memory is full, and if it's never modified, there are no further writes.
– ilkkachu
Nov 6 '17 at 14:56
This sounds like a job for the
nicefamily... ionice nice renice– RubberStamp
Nov 6 '17 at 15:03
You may also want to decrease verbosity level of logs in rsyslog configuration.
– Jaroslav Kucera
Nov 6 '17 at 15:36
my system is embedded base very shrink Debian 8 based system , that has problem with number of writes/read per-block on his flash drive, but it run an application that use pretty more resources. This is a reason why we declare swap partition if system get to critical point it will use swap partition.
– Sergey Meerovich
Nov 7 '17 at 12:15