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通过 ulimit 改善系统性能 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...理这些问题时，经常使用的一种简单手段。ulimit 是一种 linux 系统的内键功能，它具有一套参数集，用于为由它生成的 shell 进程及其子进程的资源使用设置限制。本文将在后面的章节中详细说明 ulimit 的功能，使用以及它的影响...
Measure time in Linux - time vs clock vs getrusage vs clock_gettime vs gettimeofday vs timespec_get?
...ock on the wall (or desktop).
Here's what I've found so far for clocks in Linux and OS X:
time() returns the wall-clock time from the OS, with precision in seconds.
clock() seems to return the sum of user and system time. It is present in C89 and later. At one time this was supposed to be the CPU...
How do I find the location of the executable in C? [duplicate]
...aight and realiable way is to:
readlink("/proc/self/exe", buf, bufsize) (Linux)
readlink("/proc/curproc/file", buf, bufsize) (FreeBSD)
readlink("/proc/self/path/a.out", buf, bufsize) (Solaris)
On Unixes without /proc (i.e. if above fails):
If argv[0] starts with "/" (absolute path) this is the ...
Changing default shell in Linux [closed]
...
Try linux command chsh.
The detailed command is chsh -s /bin/bash.
It will prompt you to enter your password.
Your default login shell is /bin/bash now. You must log out and log back in to see this change.
The following is quot...
How to compile a 32-bit binary on a 64-bit linux machine with gcc/cmake
..., x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.9, not stripped
$ ldd testc
linux-vdso.so.1 => (0x00007fff227ff000)
libc.so.6 => /lib64/libc.so.6 (0x000000391f000000)
/lib64/ld-linux-x86-64.so.2 (0x000000391ec00000)
$ gcc -m32 test.c -o testc
...
Linux vi arrow keys broken in insert mode
...
I presume you're using vim as this is tagged as Linux. Try:
:set nocompatible
(You may want to configure your .vimrc with this by adding this command to it. Create a new .vimrc file if not already present in your home directory, run echo $HOME to check home directory pa...
sed in-place flag that works both on Mac (BSD) and Linux
...vocation of sed todo in-place editing without backups that works both on Linux and Mac? While the BSD sed shipped with OS X seems to need sed -i '' … , the GNU sed Linux distributions usually come with interprets the quotes as empty input file name (instead of the backup extension), and nee...
Has anyone ever got a remote JMX JConsole to work?
...
I have a solution for this:
If your Java process is running on Linux behind a firewall and you want to start JConsole / Java VisualVM / Java Mission Control on Windows on your local machine to connect it to the JMX Port of your Java process.
You need access to your linux machine via SSH...
How to find the mysql data directory from command line in windows
In linux I could find the mysql installation directory with the command which mysql . But I could not find any in windows. I tried echo %path% and it resulted many paths along with path to mysql bin.
...
How do I change the number of open files limit in Linux? [closed]
... /etc/sysctl.conf.
kern.maxfilesperproc=166384
kern.maxfiles=8192
Under Linux, these settings are often in /etc/security/limits.conf.
There are two kinds of limits:
soft limits are simply the currently enforced limits
hard limits mark the maximum value which cannot be exceeded by setting a sof...