scheduling

问题 This seems to be a basic question, but i couldn't find answer anywhere in googling it. As Far As I Understand, scheduler latency is the time incurred in making the task runnable again. I mean, if there are 100 processes namely 1, 2, e.t.c, then they are executed let's say in order starting from 1. So the latency is the time that the process 1 is executed again. which means that the latency is the waiting time of the process as well as the waiting time of it when it is in runqueue ready to

问题 I have a code that I want to optimise that should run in a variaty of threads ammount. After running some tests using different scheduling techniques in a for loop that I have, I came to the conclusion that what suits best is to perform a dynamic scheduling when I have only one thread and guided otherwise. Is that even possible in openMP? To be more precise I want to be able to do something like the following: if(omp_get_max_threads()>1) #pragma omp parallel for .... scheduling(guided) else

问题 I need to start a CPU-intensive system process under low priority so that it doesn't slow down my server. How can I do this on Linux? This is similar to this question: Start a Java process at low priority using Runtime.exec / ProcessBuilder.start? except on Linux instead of Windows. It's OK if the process's priority is changed after the process is started (as long as there isn't much delay). 回答1: Run the command using /usr/bin/nice. For instance: $ /usr/bin/nice -n 10 somecommand arg1 arg2

问题 I've implemented (finally) a few goals that will schedule a series of tasks according to a startBy startAfter and duration . The schedule goal however, accepts only the prescribed number of tasks. I'd like to extend the functionality of the schedule goal to accept a single list and iterate through that list while scheduling. unfortunately I think this is going to require rather different goals than the can run and conflicts goals shown below. UPDATE: Coming close now ... can_run/3 returns

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 6 years ago . I'm looking for a good library, preferably in C#, which I can use in a windows service and it will handle all the multithreading

问题 I'm stuck with Quartz.NET cron trigger. I was able to imlpement all my scenarios apart the one below. Every X weeks on Mon,Tue,Wed... I managed to do this 0 31 15 ? * MON#2 * which triggers every second Monday. Would it work with 0 31 15 ? * MON#2,TUE#2,WED#2 * ?? I tried testing it on http://www.cronmaker.com however It only showed me Mondays as coming up dates. My only requirement is to keep it simple - ie. no more than one trigger. 回答1: I agree with Brabster. I don't think it is possible

问题 I'm using python to interface a hardware usb sniffer device with the python API provided by the vendor and I'm trying to read (usb packets) from the device in a separate thread in an infinite loop (which works fine). The problem is that my main loop does not seem to ever get scheduled again (my read loop gets all the attention). The code looks much like this: from threading import Thread import time usb_device = 0 def usb_dump(usb_device): while True: #time.sleep(0.001) packet = ReadUSBDevice

问题 Today I found a very strange problem. I ran Redhat Enterprise Linux 6, and the CPU was Intel E31275 (4 cores, 8 threads). I found one kernel thread (I called it as my_thread) didn't work correctly. With "ps" command, I found the status of my_thread was always running: ps ax 5545 ? R 3:14 [my_thread] 15774 ttyS0 Ss 0:00 -bash ... But its running time was always 3:14. Since it ws running, why didn't the total time increase? From the proc file /proc/5545/sched, I found the all statistics

问题 I'd like to allow my users to setup a schedule for their events. It could be a single day, or for convenience I'd like to allow them to specify a reoccurring event (similar to an Outlook appointment). For the single event it seems pretty easy (pseudo-code): Just have a DateOfEvent column that has the date on it. To grab future events: Select * from events where DateOfEvent > {DateTime.Now} But how could I store and query a reoccurring event? I don't need to do times, as I'd just store that

问题 Suppose that a disk drive has 5000 cylinders, numbered 0 to 4999. The drive is currently serving a request at cylinder 143, and the previous request was at cylinder 125. The queue of pending requests, in FIFO order, is 86, 1470, 913, 1774, 948, 1509, 1022, 1750, 130 Starting from the current head position, what is the total distance (in cylinders) that the disk arm moves to satisfy all the pending requests, for each of the following disk-scheduling algorithms --> C-SCAN and C-LOOK I have made