From the command line:
reports the wall clock time, and time in kernel and user mode.
Use a profiler
-- with gcc use the same options, but use grpof instead of prof
Or: call gettimeofday before the copy function is called, and then call it again after.
Subtract the two timeval structs to get the time.
man gettimeofday
Hi,
I need to time a certain function in my C/C++ code and I am experiencing some difficulties. I timed it using wallclock time so I know that it takes approximately 500-600 microseconds with
gettimeofday(&start, NULL);
// my function call
gettimeofday(&end, NULL);
answer = (end.tv_sec -... (2 Replies)
Hi,
I would like to display the exact time taken to complete running a particular tool or function or program to user
I don't know the exact time functions in unix, please help me
thanks in advance
Example:
$test.ksh
output should be
The... (10 Replies)
Hi All,
I am using solaris and nawk.
Is there any time function in nawk which is simliar to the shell `date` function ?
Can any experts show any examples? (4 Replies)
HI ,
I need to get the timedifference between two values... which funcation will help
eg: difference betweem 19:22 and 19:43 should give 21 mins (2 Replies)
hello everybody!
i want to post a question. So, I use the command 'time a.out' to time the duration of the program a.out. The return value of this function was:
real 0m4.116s
user 0m4.112s
sys 0m0.016s
What i want is! I try to find a way to get (NOT manually) the value of real time.... (2 Replies)
HI
I have a Red Hat Enterprise with Real Time kernel.
Are you aware if there are C functions for this kernel or some code/library for this OS for measuring time more lightweight than clock_gettime and gettimeofday? THe hardware I have is NUMA.
Reading forums I found gethrtime but it is... (1 Reply)
Hello, I have made a Linux Shell Script that downloads 6 files from the Internet and then deletes them. Now i want to use the function "/usr/bin/time" and "bc" to calculate how long the avergate run time for the shell script is. I therefore need to do it 100 times. My shell script code is below:
... (6 Replies)
I want to print the difference (in days) between ($7) and the oldest record date ($6) based on unique ID ($5) on a new field. In addition, I want to subtract oldest date from recent dates(in days) ($6) for each unique ID ($5).
Here is the data looks like
7 81 1 47 32070 2010-12-14 ... (11 Replies)
Hi guys and gals...
I am writing a piece of code that is dash compliant and came across this error.
I have put it in the OSX section as that is what I am using.
I have no idea what the 'dash' version is but was installed about 6 months ago.
MBP, OSX 10.12.6, default terminal running dash on... (4 Replies)
Discussion started by: wisecracker
4 Replies
LEARN ABOUT OPENSOLARIS
gettimeofday
gettimeofday(3C) Standard C Library Functions gettimeofday(3C)NAME
gettimeofday, settimeofday - get or set the date and time
SYNOPSIS
#include <sys/time.h>
int gettimeofday(struct timeval *tp, void *tzp);
int settimeofday(struct timeval *tp, void *tzp);
DESCRIPTION
The gettimeofday() function gets and the settimeofday() function sets the system's notion of the current time. The current time is
expressed in elapsed seconds and microseconds since 00:00 Universal Coordinated Time, January 1, 1970. The resolution of the system clock
is hardware dependent; the time may be updated continuously or in clock ticks.
The tp argument points to a timeval structure, which includes the following members:
long tv_sec; /* seconds since Jan. 1, 1970 */
long tv_usec; /* and microseconds */
If tp is a null pointer, the current time information is not returned or set.
The TZ environment variable holds time zone information. See TIMEZONE(4).
The tzp argument to gettimeofday() and settimeofday() is ignored.
Only privileged processes can set the time of day.
RETURN VALUES
Upon successful completion, 0 is returned. Otherwise, -1 is returned and errno is set to indicate the error.
ERRORS
The settimeofday() function will fail if:
EINVAL The structure pointed to by tp specifies an invalid time.
EPERM The {PRIV_SYS_TIME} privilege was not asserted in the effective set of the calling process.
The gettimeofday() function will fail for 32-bit interfaces if:
EOVERFLOW The system time has progressed beyond 2038, thus the size of the tv_sec member of the timeval structure pointed to by tp is
insufficient to hold the current time in seconds.
USAGE
If the tv_usec member of tp is > 500000, settimeofday() rounds the seconds upward. If the time needs to be set with better than one second
accuracy, call settimeofday() for the seconds and then adjtime(2) for finer accuracy.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |gettimeofday() is Standard. |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
SEE ALSO adjtime(2), ctime(3C), gethrtime(3C), TIMEZONE(4), attributes(5), privileges(5), standards(5)SunOS 5.11 1 Aug 2003 gettimeofday(3C)