08-01-2013
blackrageous, you answers in correct direction, thanks.
by near and far memory I mean numa. We can skip this, let's say just RAM.
cpu time is based on state, yes, and this is the question - what is exactly the state a thread is having in the moment while date is transferring from memory to cache. Is the thread goes from cpu and rescheduled into run queue or still be on cpu and running?
Let's imagine that a thread worked 1 hour without any blocked operations like I/O, just calculating with RAM, the thread is only working thread in idle multi-core system, and a half of time was consumed by transferring data from memory to cache. In such case cpu time of the thread is 30 minutes or 60 ?
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LEARN ABOUT REDHAT
pthread_detach
PTHREAD_DETACH(3) Library Functions Manual PTHREAD_DETACH(3)
NAME
pthread_detach - put a running thread in the detached state
SYNOPSIS
#include <pthread.h>
int pthread_detach(pthread_t th);
DESCRIPTION
pthread_detach put the thread th in the detached state. This guarantees that the memory resources consumed by th will be freed immediately
when th terminates. However, this prevents other threads from synchronizing on the termination of th using pthread_join.
A thread can be created initially in the detached state, using the detachstate attribute to pthread_create(3). In contrast, pthread_detach
applies to threads created in the joinable state, and which need to be put in the detached state later.
After pthread_detach completes, subsequent attempts to perform pthread_join on th will fail. If another thread is already joining the
thread th at the time pthread_detach is called, pthread_detach does nothing and leaves th in the joinable state.
RETURN VALUE
On success, 0 is returned. On error, a non-zero error code is returned.
ERRORS
ESRCH No thread could be found corresponding to that specified by th
EINVAL the thread th is already in the detached state
AUTHOR
Xavier Leroy <Xavier.Leroy@inria.fr>
SEE ALSO
pthread_create(3), pthread_join(3), pthread_attr_setdetachstate(3)
LinuxThreads PTHREAD_DETACH(3)