Changing limits with ulimit (Lab 3.1)
Hi everyone,
I am a bit unclear as to why exercise #4 in lab 3.1 results in an operation not permitted error. The solution states, "Note that if we had chosen a different limit, such as stack size (-s) we could raise back up again as the hard limit is unlimited.". What exactly does stack size refer to and how does it make a difference?
Thanks in advance.
Comments
-
Hi,
From the documentation:
ulimit [-HSTabcdefilmnpqrstuvx [limit]]
Provides control over the resources available to the shell and to processes
started by it, on systems that allow such control. The -H and -S options specify
that the hard or soft limit is set for the given resource. A hard limit cannot be
increased by a non-root user once it is set; a soft limit may be increased up to
the value of the hard limit.==> a soft limit may be increased up to the value of the hard limit.
If you want to take a look, check the man or info page for ulimit.
Regards,
Luis.
0 -
Luis,
Please note that my question refers to the meaning of the words stack size, and how that would have made a difference in the proposed lab exercise.
PS: Since ulimit is a shell builtin, it does not have a standalone man page. And as far as I can see, neither the shell builtins' man page nor the info page on ulimit explain the concept of stack size.
0 -
you can get info on "ulimit" by typing "help ulimit" as it is a built in bash command. You can't expect that to exlain what all the possibility parameters do.
Stack is the amount of memory avaialble to a process for static variables, such as arrays and other storage. Every process created is allotted such memory when it starts; by default on Linux 8MB is granted usually -- that is not so much unless you start creating thousands of processes, such as a server might, in which case you might want to limit it.
The stack is an important *programming* concept in any computing language, but a normal user would not be terribly aware of it. I'm sure a little bit of googing or look at the wikipedia would give you a deeper undrerstanding of its role in any operating system, nut just Linux.
0
Categories
- 9.1K All Categories
- 15 LFX Mentorship
- 68 LFX Mentorship: Linux Kernel
- 380 Linux Foundation Boot Camps
- 233 Cloud Engineer Boot Camp
- 75 Advanced Cloud Engineer Boot Camp
- 30 DevOps Engineer Boot Camp
- 9 Cloud Native Developer Boot Camp
- 976 Training Courses
- 15 LFC110 Class Forum
- 16 LFD102 Class Forum
- 106 LFD103 Class Forum
- 6 LFD121 Class Forum
- 56 LFD201 Class Forum
- 1 LFD213 Class Forum - Discontinued
- 128 LFD232 Class Forum
- 19 LFD254 Class Forum
- 450 LFD259 Class Forum
- 90 LFD272 Class Forum
- 1 LFD272-JP クラス フォーラム
- 16 LFS200 Class Forum
- 712 LFS201 Class Forum
- LFS201-JP クラス フォーラム
- 282 LFS211 Class Forum
- 50 LFS216 Class Forum
- 27 LFS241 Class Forum
- 28 LFS242 Class Forum
- 19 LFS243 Class Forum
- 6 LFS244 Class Forum
- 12 LFS250 Class Forum
- LFS250-JP クラス フォーラム
- 113 LFS253 Class Forum
- 814 LFS258 Class Forum
- 8 LFS258-JP クラス フォーラム
- 54 LFS260 Class Forum
- 81 LFS261 Class Forum
- 18 LFS262 Class Forum
- 76 LFS263 Class Forum
- 14 LFS264 Class Forum
- 10 LFS266 Class Forum
- 10 LFS267 Class Forum
- 9 LFS268 Class Forum
- 6 LFS269 Class Forum
- 182 LFS272 Class Forum
- 1 LFS272-JP クラス フォーラム
- 191 LFW211 Class Forum
- 114 LFW212 Class Forum
- 880 Hardware
- 207 Drivers
- 74 I/O Devices
- 44 Monitors
- 115 Multimedia
- 205 Networking
- 98 Printers & Scanners
- 82 Storage
- 730 Linux Distributions
- 85 Debian
- 64 Fedora
- 12 Linux Mint
- 13 Mageia
- 22 openSUSE
- 127 Red Hat Enterprise
- 33 Slackware
- 13 SUSE Enterprise
- 349 Ubuntu
- 450 Linux System Administration
- 33 Cloud Computing
- 64 Command Line/Scripting
- Github systems admin projects
- 89 Linux Security
- 76 Network Management
- 105 System Management
- 45 Web Management
- 51 Mobile Computing
- 19 Android
- 19 Development
- 1.2K New to Linux
- 1.1K Getting Started with Linux
- 501 Off Topic
- 121 Introductions
- 193 Small Talk
- 19 Study Material
- 756 Programming and Development
- 243 Kernel Development
- 479 Software Development
- 903 Software
- 247 Applications
- 178 Command Line
- 2 Compiling/Installing
- 73 Games
- 314 Installation
- 26 All In Program
- 26 All In Forum
Upcoming Training
-
August 20, 2018
Kubernetes Administration (LFS458)
-
August 20, 2018
Linux System Administration (LFS301)
-
August 27, 2018
Open Source Virtualization (LFS462)
-
August 27, 2018
Linux Kernel Debugging and Security (LFD440)