thread-priority

问题 I'd like to write a code which prints the default thread's priority, but I don't know if this is possible. So far I created a thread with default attributes, but I didn't find any statement which allows me to store and print its default priority. // main.c #include <stdlib.h> #include <stdio.h> #include <pthread.h> #include <sched.h> #include "task.h" int main() { pthread_attr_t attr; struct sched_param prio; pthread_t tid; int create = 1; // default attributes pthread_attr_init(&attr);

问题 I'm wondering if there is a way to print the priority of the main. In this question I asked how to print the deafult priority of a thread; now I'm very curious to know if it's possible to do the same for the main. EDIT: my goal is to get the priority of the unique process I created (I'm using pthread library to create threads inside the int main block). The process should not be a normal process, but a real time process, so i cannot use the getpriority function. It can be used only for normal

问题 We have a Spring application, I want to add a service that will handle 10Ks IDs with multiple threads but will be as background process without impact production realtime . Service will update database and send external providers requests. I don't want service to impact/effect production performance /timing, I want to execute operation on each ID in a low priority I read previous post about setting priority in Executer, but I want low priority to all other threads that can be outside this

问题 On a Unix system, you can run a process at lower CPU priority using the nice command: nice program And you could use that to run a JVM process: nice java -jar program.jar The Java program run by that JVM process will start multiple threads. Does the nice change affect the scheduling of those Java threads? That is, will the Java threads have a lower CPU priority when run as nice java -jar program.jar that when run as java -jar program.jar In general, this will be system dependent, so I am

问题 I'm trying to provoke Priority Inversion on a small C++ program for demonstration purposes but I can't: The low priority thread that holds the mutex is not preempted and keeps running on the critical section. This is what I'm doing: // let's declare a global mutex pthread_mutex_t my_mutex; ... int main(int argc, char **argv) { ... pthread_t normal_thread; pthread_t prio_thread; pthread_mutexattr_t attr; pthread_mutexattr_init (&attr); pthread_mutexattr_setprotocol (&attr, PTHREAD_PRIO_NONE);

问题 I'm trying to provoke Priority Inversion on a small C++ program for demonstration purposes but I can't: The low priority thread that holds the mutex is not preempted and keeps running on the critical section. This is what I'm doing: // let's declare a global mutex pthread_mutex_t my_mutex; ... int main(int argc, char **argv) { ... pthread_t normal_thread; pthread_t prio_thread; pthread_mutexattr_t attr; pthread_mutexattr_init (&attr); pthread_mutexattr_setprotocol (&attr, PTHREAD_PRIO_NONE);

问题 I'm trying to provoke Priority Inversion on a small C++ program for demonstration purposes but I can't: The low priority thread that holds the mutex is not preempted and keeps running on the critical section. This is what I'm doing: // let's declare a global mutex pthread_mutex_t my_mutex; ... int main(int argc, char **argv) { ... pthread_t normal_thread; pthread_t prio_thread; pthread_mutexattr_t attr; pthread_mutexattr_init (&attr); pthread_mutexattr_setprotocol (&attr, PTHREAD_PRIO_NONE);

问题 I'm trying to test 2 threads, one with high, and the other with low priority. According to my results sometimes the low priority thread is faster, how is this possible? I've tested the different priority threads by increment a click variable inside each thread. I've also increased and decreased the sleep time, but nothing. Since I was testing with no heavy programs running in the background, I decided to test with an HD movie running, but still no real change, threads are always the same

问题 I can see number of threads used in application by going to /proc/$(pidof task)/ and giving cat status. Is there any way to check individual thread priority in linux using commands? Regards, Learner 回答1: Run ps with -m -l . It will list all the thread and priority with respect to particular PID ps -m -l [PID] Example: PC@PCuser:~$ ps -m -l 10070 F S UID PID PPID C PRI NI ADDR SZ WCHAN TTY TIME CMD 0 - 1000 10070 1 0 - - - 31325 - ? 0:42 gedit 0 S 1000 - - 0 80 0 - - poll_s - 0:41 - 1 S 1000 -

问题 exampl: new Thread(new Runnable() { public void run() { while(condition) { *code that must not be interrupted* *some more code* } } }).start(); SomeOtherThread.start(); YetAntherThread.start(); How can you ensure that code that must not be interrupted won't be interrupted? 回答1: You can't - at least not with normal Java, running on a normal, non-real-time operating system. Even if other threads don't interrupt yours, other processes might well do so. Basically you won't be able to guarantee