9 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Hey guys,
Suppose i run passwd via bash shell. It is a suid program, which temporarily runs as root(owner) and modifies the user entries.
However, when i write a C file and give 4755 permission and root ownership to the 'a.out' file , it doesn't run as root in bash shell. I verified this by... (2 Replies)
Discussion started by: syncmaster
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2. Red Hat
Dear Guru,
IHAC who complaint that his CentOS is getting performance issue.
I have to help him out of there.
Could you please tell me which tools is better to gathering the whole system performance data?
-- CPU/Memory/IO(disk & Network)/swap
I would like the tools could be... (6 Replies)
Discussion started by: devyfong
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3. UNIX for Advanced & Expert Users
As an addition to our ongoing investigation into static code analysis tools for a Perl programming we are maintaining, can anyone recommend a certain tool that he/she is experienced with?
We are already actively using perl::critic (Perl::Critic) and rats... (2 Replies)
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4. UNIX for Dummies Questions & Answers
Hey Guys,
Does anyone know how to count the separate amount of words in a text file?
e.g
the 5
and 20
Furthermore does anyone know how to convert whole numbers in decimals?
Thanks (24 Replies)
Discussion started by: John0101
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5. UNIX and Linux Applications
When ran configure for speech tools 1.2.96-beta (festival speech synthesis) on Slackware 13.0 seems it is erroneously coded.
This code sequence gets flagged 5 times http://www.unix.com/images/icons/icon8.gif in configure:
int main() {
int j=
#if __GNUC__ == 3
... (6 Replies)
Discussion started by: slak0
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6. UNIX for Dummies Questions & Answers
Are the programs written on schedulers ,thread library , process management, memory management, et al called systems programs ? How are they different from the programs that implement functions like open() , printf() , scanf() , read() .. they have a prefix sys_open, sys_close, sys_read etc , right... (1 Reply)
Discussion started by: vishwamitra
1 Replies
7. Shell Programming and Scripting
General Question: If a script calls multiple external programs (external to the script, but still on unix), where do the return codes go? Let's say one of external programs fails, does the entire script fail and send a non-zero return code to the job scheduling software, or is the return code sent... (1 Reply)
Discussion started by: jnanasakti
1 Replies
8. UNIX for Dummies Questions & Answers
Hello,
Do we have any freeware which helps in alignment of code wrt spaces, sections etc?
Thanks (6 Replies)
Discussion started by: eagercyber
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9. Answers to Frequently Asked Questions
Every now and then our users post complete programs to this site. It is especially important that these contributions don't get lost, so I will collect them here. Some of these programs are intended to demonstrate a programming technique and some are ready to run. As a guideline, the code... (0 Replies)
Discussion started by: Perderabo
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dispatch_benchmark(3) BSD Library Functions Manual dispatch_benchmark(3)
NAME
dispatch_benchmark -- Measures block execution time
SYNOPSIS
#include <dispatch/dispatch.h>
uint64_t
dispatch_benchmark(size_t count, void (^block)(void));
uint64_t
dispatch_benchmark_f(size_t count, void *context, void (*function)(void *));
DESCRIPTION
The dispatch_benchmark() function executes the given block multiple times according to the count variable and then returns the average number
of nanoseconds per execution. This function is for debugging and performance analysis work. For the best results, pass a high count value
to dispatch_benchmark(). When benchmarking concurrent code, please compare the serial version of the code against the concurrent version,
and compare the concurrent version on different classes of hardware. Please look for inflection points with various data sets and keep the
following facts in mind:
o Code bound by computational bandwidth may be inferred by proportional changes in performance as concurrency is increased.
o Code bound by memory bandwidth may be inferred by negligible changes in performance as concurrency is increased.
o Code bound by critical sections may be inferred by retrograde changes in performance as concurrency is increased.
o Intentional: locks, mutexes, and condition variables.
o Accidental: unrelated and frequently modified data on the same cache-line.
RETURN VALUE
The dispatch_benchmark() function returns the average number of nanoseconds the given block takes to execute.
SEE ALSO
dispatch(3)
Darwin May 1, 2009 Darwin