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1. Red Hat
Hi,
i am new to linux/RHEL 6.0 and i have two questions.
1) How to get the CPU utilization and Memory Utilization of all Services running currently?
2) How to get the CPU utilization and Memory Utilization of all Applications running currently?
Please help me to find the script.
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2. AIX
Hi,
i am seeing some strange things on a lpar which we have at this moment.
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Hi Experts,
If a thread running on CPU needs some data from RAM (from near or far RAM) it requests the data (this moment of time is t0) and gets it in moment of time in t1, and continues his work.
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4. Shell Programming and Scripting
Hi ,
I am trying to :wall: my head while scripting ..I am really new to this stuff , never did it before :( .
how to find cpu's system high time and user time high in a script??
thanks , help would be appreciated !
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5. Solaris
We are using JAVA program and strange thing is it takes 100% CPU when not in use.
The program function is to stream a file on output port (one direction). It checks one directory and when there is a file in it, starts.
While it is streaming the CPU usage is normal, about 20%.
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6. UNIX Desktop Questions & Answers
Hi i am a newbie thanks in advance
i have a process which keeps on running but doesn't use any CPU time and doesn't do the functionality which it is suppose to do .
If i kill the process and start the process again then the process kicks in and starts using CPU time and continues to do its... (3 Replies)
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7. Shell Programming and Scripting
I thought a program's elapsed time, some program language call it real time, should be the time of a program from start to finish. And it should be equal or longer than CPU time. This is true for the most of the cases. However, I do see some of my programs CPU time is longer than Elapsed time. ... (1 Reply)
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8. HP-UX
Hi,
I am loking for a c++ function that calculate CPU time under HP-UX
Thank you (1 Reply)
Discussion started by: limame
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CLOCK_GETCPUCLOCKID(3) Linux Programmer's Manual CLOCK_GETCPUCLOCKID(3)
NAME
clock_getcpuclockid - obtain ID of a process CPU-time clock
SYNOPSIS
#include <time.h>
int clock_getcpuclockid(pid_t pid, clockid_t *clock_id);
Link with -lrt.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
clock_getcpuclockid(): _XOPEN_SOURCE >= 600
DESCRIPTION
The clock_getcpuclockid() function obtains the ID of the CPU-time clock of the process whose ID is pid, and returns it in the location
pointed to by clock_id. If pid is zero, then the clock ID of the CPU-time clock of the calling process is returned.
RETURN VALUE
On success, clock_getcpuclockid() returns 0; on error, it returns a positive error number.
ERRORS
ENOSYS The kernel does not support obtaining the per-process CPU-time clock of another process, and pid does not specify the calling
process.
EPERM The caller does not have permission to access the CPU-time clock of the process specified by pid. (Specified as an optional error
in POSIX.1-2001; does not occur on Linux unless the kernel does not support obtaining the per-process CPU-time clock of another
process.)
ESRCH There is no process with the ID pid.
VERSIONS
The clock_getcpuclockid() function is available in glibc since version 2.2.
CONFORMING TO
POSIX.1-2001.
NOTES
Calling clock_gettime(2) with the clock ID obtained by a call to clock_getcpuclockid() with a pid of 0, is the same as using the clock ID
CLOCK_PROCESS_CPUTIME_ID.
EXAMPLE
The example program below obtains the CPU-time clock ID of the process whose ID is given on the command line, and then uses clock_get-
time(2) to obtain the time on that clock. An example run is the following:
$ ./a.out 1 # Show CPU clock of init process
CPU-time clock for PID 1 is 2.213466748 seconds
Program source
#define _XOPEN_SOURCE 600
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <time.h>
int
main(int argc, char *argv[])
{
clockid_t clockid;
struct timespec ts;
if (argc != 2) {
fprintf(stderr, "%s <process-ID>
", argv[0]);
exit(EXIT_FAILURE);
}
if (clock_getcpuclockid(atoi(argv[1]), &clockid) != 0) {
perror("clock_getcpuclockid");
exit(EXIT_FAILURE);
}
if (clock_gettime(clockid, &ts) == -1) {
perror("clock_gettime");
exit(EXIT_FAILURE);
}
printf("CPU-time clock for PID %s is %ld.%09ld seconds
",
argv[1], (long) ts.tv_sec, (long) ts.tv_nsec);
exit(EXIT_SUCCESS);
}
SEE ALSO
clock_getres(2), timer_create(2), pthread_getcpuclockid(3), time(7)
COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2009-02-20 CLOCK_GETCPUCLOCKID(3)