ulimit -n (open files) increments
I had to increase the open file limit for a user on my system, and I was wondering how the open file limit descriptors are being kept track of and if these are stored in bit/byte increments.
Imagine I configure the open file limit to 5. In binary, this is 101. This means that not all of the bit values are used (in the range 000 to 111).
Does this result in wasted space because some memory locations are unused? Or does the OS not care about this?
Is there a different in terms of wasted memory locations between setting the nofiles limit to 100b instead of 111b?
I know the question is stated in a confusing way but I don't really know how to word the thing I'm questioning. Maybe someone can propose an edit, if they understand what I am asking. It's somewhat comparable with a 32-bit register not being able to store all memory locations of 4Gb of RAM.
linux operating-systems ulimit file-descriptors
asked Jan 31 at 13:14
TitulumTitulum
1014
add a comment |
I had to increase the open file limit for a user on my system, and I was wondering how the open file limit descriptors are being kept track of and if these are stored in bit/byte increments.
Imagine I configure the open file limit to 5. In binary, this is 101. This means that not all of the bit values are used (in the range 000 to 111).
Does this result in wasted space because some memory locations are unused? Or does the OS not care about this?
Is there a different in terms of wasted memory locations between setting the nofiles limit to 100b instead of 111b?
I know the question is stated in a confusing way but I don't really know how to word the thing I'm questioning. Maybe someone can propose an edit, if they understand what I am asking. It's somewhat comparable with a 32-bit register not being able to store all memory locations of 4Gb of RAM.
linux operating-systems ulimit file-descriptors
asked Jan 31 at 13:14
TitulumTitulum
1014
Technically you're wasting 'one bit'.
– djsmiley2k
Jan 31 at 13:16
add a comment |
I had to increase the open file limit for a user on my system, and I was wondering how the open file limit descriptors are being kept track of and if these are stored in bit/byte increments.
Imagine I configure the open file limit to 5. In binary, this is 101. This means that not all of the bit values are used (in the range 000 to 111).
Does this result in wasted space because some memory locations are unused? Or does the OS not care about this?
Is there a different in terms of wasted memory locations between setting the nofiles limit to 100b instead of 111b?
I know the question is stated in a confusing way but I don't really know how to word the thing I'm questioning. Maybe someone can propose an edit, if they understand what I am asking. It's somewhat comparable with a 32-bit register not being able to store all memory locations of 4Gb of RAM.
linux operating-systems ulimit file-descriptors
asked Jan 31 at 13:14
TitulumTitulum
1014
I had to increase the open file limit for a user on my system, and I was wondering how the open file limit descriptors are being kept track of and if these are stored in bit/byte increments.
Imagine I configure the open file limit to 5. In binary, this is 101. This means that not all of the bit values are used (in the range 000 to 111).
Does this result in wasted space because some memory locations are unused? Or does the OS not care about this?
Is there a different in terms of wasted memory locations between setting the nofiles limit to 100b instead of 111b?
I know the question is stated in a confusing way but I don't really know how to word the thing I'm questioning. Maybe someone can propose an edit, if they understand what I am asking. It's somewhat comparable with a 32-bit register not being able to store all memory locations of 4Gb of RAM.
linux operating-systems ulimit file-descriptors
linux operating-systems ulimit file-descriptors
asked Jan 31 at 13:14
TitulumTitulum
1014
asked Jan 31 at 13:14
TitulumTitulum
1014
asked Jan 31 at 13:14
TitulumTitulum
1014
asked Jan 31 at 13:14
TitulumTitulum
1014
asked Jan 31 at 13:14
TitulumTitulum
1014
1014
Technically you're wasting 'one bit'.
– djsmiley2k
Jan 31 at 13:16
add a comment |
Technically you're wasting 'one bit'.
– djsmiley2k
Jan 31 at 13:16
Technically you're wasting 'one bit'.
– djsmiley2k
Jan 31 at 13:16
Technically you're wasting 'one bit'.
– djsmiley2k
Jan 31 at 13:16
add a comment |
0
active
oldest
votes
Your Answer
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "3"
};
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%2fsuperuser.com%2fquestions%2f1400560%2fulimit-n-open-files-increments%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
Thanks for contributing an answer to Super User!
- 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%2fsuperuser.com%2fquestions%2f1400560%2fulimit-n-open-files-increments%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
Technically you're wasting 'one bit'.
– djsmiley2k
Jan 31 at 13:16