How to swap more often
My PC has swappiness set to 60.
cat /proc/sys/vm/swappiness
60
Even so, swap only occurred when the PC runs out of RAM. So, every time I fill the RAM, it stops responding for a while while it is swapping into its HDD.
I thought that with swappiness of 60, proximately 60% of (full size of) RAM would be mirrored on swap so it is already there when needed to be swapped out... But that is not what I am experiencing.
I've read the manual and many different answers here but none is about having swappiness on the right value and swap not occurring until the very last moment.
18.04 performance swap memory-usage
asked 7 hours ago
brunoaisbrunoais
1115
add a comment |
My PC has swappiness set to 60.
cat /proc/sys/vm/swappiness
60
Even so, swap only occurred when the PC runs out of RAM. So, every time I fill the RAM, it stops responding for a while while it is swapping into its HDD.
I thought that with swappiness of 60, proximately 60% of (full size of) RAM would be mirrored on swap so it is already there when needed to be swapped out... But that is not what I am experiencing.
I've read the manual and many different answers here but none is about having swappiness on the right value and swap not occurring until the very last moment.
18.04 performance swap memory-usage
asked 7 hours ago
brunoaisbrunoais
1115
2
afaik swap is not a mirror but more like an extension of your ram.
– RoVo
6 hours ago
@RoVo Is it more clear with the changes I did?
– brunoais
6 hours ago
How much RAM and Swap space do you have, and what makes your machine run out of RAM?
– Soren A
4 hours ago
add a comment |
My PC has swappiness set to 60.
cat /proc/sys/vm/swappiness
60
Even so, swap only occurred when the PC runs out of RAM. So, every time I fill the RAM, it stops responding for a while while it is swapping into its HDD.
I thought that with swappiness of 60, proximately 60% of (full size of) RAM would be mirrored on swap so it is already there when needed to be swapped out... But that is not what I am experiencing.
I've read the manual and many different answers here but none is about having swappiness on the right value and swap not occurring until the very last moment.
18.04 performance swap memory-usage
asked 7 hours ago
brunoaisbrunoais
1115
My PC has swappiness set to 60.
cat /proc/sys/vm/swappiness
60
Even so, swap only occurred when the PC runs out of RAM. So, every time I fill the RAM, it stops responding for a while while it is swapping into its HDD.
I thought that with swappiness of 60, proximately 60% of (full size of) RAM would be mirrored on swap so it is already there when needed to be swapped out... But that is not what I am experiencing.
I've read the manual and many different answers here but none is about having swappiness on the right value and swap not occurring until the very last moment.
18.04 performance swap memory-usage
18.04 performance swap memory-usage
asked 7 hours ago
brunoaisbrunoais
1115
asked 7 hours ago
brunoaisbrunoais
1115
edited 6 hours ago
brunoais
asked 7 hours ago
brunoaisbrunoais
1115
asked 7 hours ago
brunoaisbrunoais
1115
asked 7 hours ago
brunoaisbrunoais
1115
1115
2
afaik swap is not a mirror but more like an extension of your ram.
– RoVo
6 hours ago
@RoVo Is it more clear with the changes I did?
– brunoais
6 hours ago
How much RAM and Swap space do you have, and what makes your machine run out of RAM?
– Soren A
4 hours ago
add a comment |
2
afaik swap is not a mirror but more like an extension of your ram.
– RoVo
6 hours ago
@RoVo Is it more clear with the changes I did?
– brunoais
6 hours ago
How much RAM and Swap space do you have, and what makes your machine run out of RAM?
– Soren A
4 hours ago
2
2
afaik swap is not a mirror but more like an extension of your ram.
– RoVo
6 hours ago
afaik swap is not a mirror but more like an extension of your ram.
– RoVo
6 hours ago
@RoVo Is it more clear with the changes I did?
– brunoais
6 hours ago
@RoVo Is it more clear with the changes I did?
– brunoais
6 hours ago
How much RAM and Swap space do you have, and what makes your machine run out of RAM?
– Soren A
4 hours ago
How much RAM and Swap space do you have, and what makes your machine run out of RAM?
– Soren A
4 hours ago
add a comment |
1 Answer
1
active
oldest
votes
Swappiness is just a parameter that the kernel uses to calculate a swap tendency. I read the manual and I was unable to find where it states that /proc/sys/vm/swappiness is some kind of threshold.
About this topic, Red Hat Knowledge Base states:
this parameter sets the kernel's balance between reclaiming pages from the page cache and reclaiming pages by swapping out process memory
Also, another answer in Ask Ubuntu states:
Swapping is a slow and costly operation, so the system avoids it unless it calculates that the trade-off in cache performance will make up for it overall, or if it's necessary to avoid killing processes.
A lot of the time people will look at their system that is thrashing the disk heavily and using a lot of swap space and blame swapping for it. That's the wrong approach to take. If swapping ever reaches this extreme, it means that swapping is your system's attempt to deal with low memory problems, not the cause of the problem.
Hence, I think you are working on a misconception about how swap and swappiness works.
answered 5 hours ago
PEdroArthurPEdroArthur
37124
add a comment |
Your Answer
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "89"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2faskubuntu.com%2fquestions%2f1109629%2fhow-to-swap-more-often%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Swappiness is just a parameter that the kernel uses to calculate a swap tendency. I read the manual and I was unable to find where it states that /proc/sys/vm/swappiness is some kind of threshold.
About this topic, Red Hat Knowledge Base states:
this parameter sets the kernel's balance between reclaiming pages from the page cache and reclaiming pages by swapping out process memory
Also, another answer in Ask Ubuntu states:
Swapping is a slow and costly operation, so the system avoids it unless it calculates that the trade-off in cache performance will make up for it overall, or if it's necessary to avoid killing processes.
A lot of the time people will look at their system that is thrashing the disk heavily and using a lot of swap space and blame swapping for it. That's the wrong approach to take. If swapping ever reaches this extreme, it means that swapping is your system's attempt to deal with low memory problems, not the cause of the problem.
Hence, I think you are working on a misconception about how swap and swappiness works.
answered 5 hours ago
PEdroArthurPEdroArthur
37124
add a comment |
Swappiness is just a parameter that the kernel uses to calculate a swap tendency. I read the manual and I was unable to find where it states that /proc/sys/vm/swappiness is some kind of threshold.
About this topic, Red Hat Knowledge Base states:
this parameter sets the kernel's balance between reclaiming pages from the page cache and reclaiming pages by swapping out process memory
Also, another answer in Ask Ubuntu states:
Swapping is a slow and costly operation, so the system avoids it unless it calculates that the trade-off in cache performance will make up for it overall, or if it's necessary to avoid killing processes.
A lot of the time people will look at their system that is thrashing the disk heavily and using a lot of swap space and blame swapping for it. That's the wrong approach to take. If swapping ever reaches this extreme, it means that swapping is your system's attempt to deal with low memory problems, not the cause of the problem.
Hence, I think you are working on a misconception about how swap and swappiness works.
answered 5 hours ago
PEdroArthurPEdroArthur
37124
add a comment |
Swappiness is just a parameter that the kernel uses to calculate a swap tendency. I read the manual and I was unable to find where it states that /proc/sys/vm/swappiness is some kind of threshold.
About this topic, Red Hat Knowledge Base states:
this parameter sets the kernel's balance between reclaiming pages from the page cache and reclaiming pages by swapping out process memory
Also, another answer in Ask Ubuntu states:
Swapping is a slow and costly operation, so the system avoids it unless it calculates that the trade-off in cache performance will make up for it overall, or if it's necessary to avoid killing processes.
A lot of the time people will look at their system that is thrashing the disk heavily and using a lot of swap space and blame swapping for it. That's the wrong approach to take. If swapping ever reaches this extreme, it means that swapping is your system's attempt to deal with low memory problems, not the cause of the problem.
Hence, I think you are working on a misconception about how swap and swappiness works.
answered 5 hours ago
PEdroArthurPEdroArthur
37124
Swappiness is just a parameter that the kernel uses to calculate a swap tendency. I read the manual and I was unable to find where it states that /proc/sys/vm/swappiness is some kind of threshold.
About this topic, Red Hat Knowledge Base states:
this parameter sets the kernel's balance between reclaiming pages from the page cache and reclaiming pages by swapping out process memory
Also, another answer in Ask Ubuntu states:
Swapping is a slow and costly operation, so the system avoids it unless it calculates that the trade-off in cache performance will make up for it overall, or if it's necessary to avoid killing processes.
A lot of the time people will look at their system that is thrashing the disk heavily and using a lot of swap space and blame swapping for it. That's the wrong approach to take. If swapping ever reaches this extreme, it means that swapping is your system's attempt to deal with low memory problems, not the cause of the problem.
Hence, I think you are working on a misconception about how swap and swappiness works.
answered 5 hours ago
PEdroArthurPEdroArthur
37124
answered 5 hours ago
PEdroArthurPEdroArthur
37124
answered 5 hours ago
PEdroArthurPEdroArthur
37124
answered 5 hours ago
PEdroArthurPEdroArthur
37124
37124
add a comment |
add a comment |
Thanks for contributing an answer to Ask Ubuntu!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2faskubuntu.com%2fquestions%2f1109629%2fhow-to-swap-more-often%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
2
afaik swap is not a mirror but more like an extension of your ram.
– RoVo
6 hours ago
@RoVo Is it more clear with the changes I did?
– brunoais
6 hours ago
How much RAM and Swap space do you have, and what makes your machine run out of RAM?
– Soren A
4 hours ago