I read the abstract. That sounds like a good start, but it is, er, abstract. If your needs are more specific, you'll need to provide info on what kind of system you are trying to optimize.
hi guys,
i got job recently in a company which provide a product for data backup and data recovery... as dis product is wrriten in c++ am workin in c++.. now am under training and i want to learn abt Operating System concepts and OS programming using c and c++. i know basic c and c++ programming... (3 Replies)
Team,
I am working in unix perl . i have come across scenarios where there are lots of unix concepts are being used.
For example, Handle, pipes, forking ,data sharing between processes,parallel processing and so on. I need some conceptual explanation about the unix system .
I... (5 Replies)
Hi everyone,
I would like to have good understanding of i18N & L10N implementations in Linux.
What does it mean actually,interms of software development?
Where it is used and how it is used?
It would be more helpful to me, if anyone send me the links to "basics of i18N... (0 Replies)
Hello,
I've been reading the AIX 5.1 System Concepts PDF but I'm still confused about some file-system concepts and their relationships.
What is the 'allocation group size'?
How are 'disk allocation unit'/'fragment size', NBPI and 'allocation group size'?
And how are the above three... (2 Replies)
cpc_enable(3CPC) CPU Performance Counters Library Functions cpc_enable(3CPC)NAME
cpc_enable, cpc_disable - enable and disable performance counters
SYNOPSIS
cc [ flag... ] file... -lcpc [ library... ]
#include <libcpc.h>
int cpc_enable(cpc_t *cpc);
int cpc_disable(cpc_t *cpc);
DESCRIPTION
In certain applications, it can be useful to explicitly enable and disable performance counters at different times so that the performance
of a critical algorithm can be examined. The cpc_enable() and cpc_disable() functions can be used to enable and disable the performance
counters without otherwise disturbing the invoking LWP's performance hardware configuration.
RETURN VALUES
Upon successful completion, cpc_enable() and cpc_disable() return 0. Otherwise, they return -1 and set errno to indicate the error.
ERRORS
These functions will fail if:
EAGAIN The associated performance counter context has been invalidated by another process.
EINVAL No performance counter context has been created for the calling LWP.
EXAMPLES
Example 1 Use cpc_enable and cpc_disable to minimize code needed by application.
In the following example, the cpc_enable() and cpc_disable() functions are used to minimize the amount of code that needs to be added to
the application. The cputrack(1) command can be used in conjunction with these functions to provide event programming, sampling, and
reporting facilities.
If the application is instrumented in this way and then started by cputrack with the nouser flag set in the event specification, counting
of user events will only be enabled around the critical code section of interest. If the program is run normally, no harm will ensue.
int
main(int argc, char *argv[])
{
cpc_t *cpc = cpc_open(CPC_VER_CURRENT);
/* ... application code ... */
if (cpc != NULL)
(void) cpc_enable(cpc);
/* ==> Code to be measured goes here <== */
if (cpc != NULL)
(void) cpc_disable(cpc);
/* ... other application code */
}
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Evolving |
+-----------------------------+-----------------------------+
|MT-Level |Safe |
+-----------------------------+-----------------------------+
SEE ALSO cputrack(1), cpc(3CPC), cpc_open(3CPC), libcpc(3LIB), attributes(5)SunOS 5.11 31 Jan 2005 cpc_enable(3CPC)