09-19-2008
PS call utimes(struct tms *) to actual times, plus granularity is CLK_TCK, usually way better than time().
gettimeofday can be used to get wall time even more accurately as well. utimes() returns clock_t wall time.
9 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
hi, is there any command where we can monitor semaphores? (1 Reply)
Discussion started by: yls177
1 Replies
2. UNIX for Dummies Questions & Answers
Hi,
I'm new to UNIX.
I need to know what's a semaphore
Do reply.
Thanks
VJ (3 Replies)
Discussion started by: vjsony
3 Replies
3. Filesystems, Disks and Memory
Hello,
I have a Supermicro server with a P4SCI mother board running Debian Sarge 3.1. This is the "dmidecode" output related to RAM info:
RAM speed information is incomplete.. "Current Speed: Unknown", is there anyway/soft to get the speed of installed RAM modules? thanks!!
Regards :)... (0 Replies)
Discussion started by: Santi
0 Replies
4. Shell Programming and Scripting
Hi,
I am looking to use a semaphore for the first time in one of my scripts. I am just wondering if there are any simple examples or tutorials around?
I am a beginner so the simpler the better :)
Thanks
-Jaken (2 Replies)
Discussion started by: Jaken
2 Replies
5. UNIX for Dummies Questions & Answers
what is semaphore? can any body explain it in a more simple way than the manual ??
replies appreciated
Regards
raguram R (7 Replies)
Discussion started by: raguramtgr
7 Replies
6. Filesystems, Disks and Memory
I analysed disk performance with blktrace and get some data:
read:
8,3 4 2141 2.882115217 3342 Q R 195732187 + 32
8,3 4 2142 2.882116411 3342 G R 195732187 + 32
8,3 4 2144 2.882117647 3342 I R 195732187 + 32
8,3 4 2145 ... (1 Reply)
Discussion started by: W.C.C
1 Replies
7. Shell Programming and Scripting
Control two exclusively shared resources(semaphore). The two resources are two files. The producer will write even numbers to one file, and odd numbers to another one. The consumer respectively reads from each file until it gets 5 even numbers and 5 odd numbers.
Can any one help me with the... (0 Replies)
Discussion started by: gokult
0 Replies
8. Programming
If I create a semaphore and then I fork a number of child processes then all the child process use that same semaphore.
Since the process address spaces are different rfom each other then how all the child process are able to access the same semaphore?
I understand that semaphore/mutex is at os... (0 Replies)
Discussion started by: rupeshkp728
0 Replies
9. UNIX for Beginners Questions & Answers
I was asked to add this piece of code to a c program which I will execute through the shell:
for(long i = 0; i < NITER; i++)
{ sem_wait( &sema);
count++;
sem_post( &sema); }
I didn't get it, which is the critical section ? if it's "count++" how would a thread wake up in order to enter it... (1 Reply)
Discussion started by: uniran
1 Replies
TIMES(2) System Calls Manual TIMES(2)
NAME
times - get process times
SYNOPSIS
#include <sys/types.h>
#include <sys/times.h>
#include <time.h>
int times(struct tms *buffer)
DESCRIPTION
Times returns time-accounting information for the current process and for the terminated child processes of the current process. All times
are in 1/CLOCKS_PER_SEC seconds.
This is the structure returned by times:
struct tms {
clock_t tms_utime; /* user time for this process */
clock_t tms_stime; /* system time for this process */
clock_t tms_cutime; /* children's user time */
clock_t tms_cstime; /* children's system time */
};
The user time is the number of clock ticks used by a process on its own computations. The system time is the number of clock ticks spent
inside the kernel on behalf of a process. This does not include time spent waiting for I/O to happen, only actual CPU instruction times.
The children times are the sum of the children's process times and their children's times.
RETURN
Times returns 0 on success, otherwise -1 with the error code stored into the global variable errno.
ERRORS
The following error code may be set in errno:
[EFAULT] The address specified by the buffer parameter is not in a valid part of the process address space.
SEE ALSO
time(1), wait(2), time(2).
4th Berkeley Distribution May 9, 1985 TIMES(2)