switching

问题 I'm confused of user/kernel thread and mode/context switch (Platform: Linux) I have two linked questions. (1) Is the below sentence right? If I make a system call, then mode switch (user mode to kernel mode) will occur and eventually switching from user thread to kernel thread happens. Since system call can only be executed in kernel thread, I think mode switch must occur the switching from the user thread to kernel thread. (2) Then, what we call the overhead of mode switching is that

问题 I'm confused of user/kernel thread and mode/context switch (Platform: Linux) I have two linked questions. (1) Is the below sentence right? If I make a system call, then mode switch (user mode to kernel mode) will occur and eventually switching from user thread to kernel thread happens. Since system call can only be executed in kernel thread, I think mode switch must occur the switching from the user thread to kernel thread. (2) Then, what we call the overhead of mode switching is that

问题 I'm confused of user/kernel thread and mode/context switch (Platform: Linux) I have two linked questions. (1) Is the below sentence right? If I make a system call, then mode switch (user mode to kernel mode) will occur and eventually switching from user thread to kernel thread happens. Since system call can only be executed in kernel thread, I think mode switch must occur the switching from the user thread to kernel thread. (2) Then, what we call the overhead of mode switching is that

问题 I'm confused of user/kernel thread and mode/context switch (Platform: Linux) I have two linked questions. (1) Is the below sentence right? If I make a system call, then mode switch (user mode to kernel mode) will occur and eventually switching from user thread to kernel thread happens. Since system call can only be executed in kernel thread, I think mode switch must occur the switching from the user thread to kernel thread. (2) Then, what we call the overhead of mode switching is that

问题 I have to make a pdf document like this. In itext 7, I made columns document by ColumnDocumentRenderer class but i can't made like this. Whole document was separated to two columns. https://riptutorial.com/itext/example/20402/text2pdfcolumns-java--itext-7- Can someonw help me? 回答1: I solved this problem by self. i refer these pages. https://kb.itextpdf.com/home/it7kb/ebooks/itext-7-building-blocks/chapter-2-adding-content-to-a-canvas-or-a-document https://kb.itextpdf.com/home/it7kb/examples

问题 I have a link between a host and a switch. The link has a bandwidth & a latency. How to calculate the time of 2 packets(with size 1KB) to be transferred from Host A to Switch 1 ? Here's the diagram(I am talking about the first link) Note: I just want to calculate it manually for these values, I want to know the principles/laws of calculating these problems. 回答1: Propagation time = (Frame Serialization Time) + (Link Media Delay) + (Queueing Delay) + (Node Processing Delay - if known) Formulas:

问题 i need to switch between two variables so i am able to serve two variables equally for example i have $ad1 $ad2 i want to serve both ads equally using a light method with no database using random method won't serve both equally can you please guide me how to achieve this ? 回答1: But the random method (50/50) should serve both equally, given enough requests. And it is the simplest solution imho. <?php $ad1 = '<img src... >'; $ad2 = '<img src...2 >'; echo mt_rand(0, 1) ? $ad1 : $ad2; ?> 回答2: You

问题 My game has 1000+ frames and format of sprites is Crunch because of too many sprites in this project. when I want to switch it from windows to android it takes me almost 1 day to switch (actually I don't permit it to switch completely) but switching to windows is not that much, maybe just 15 minuets. Just I want to know is it sensible or not ? and if it doesn't, is there any solution ? 回答1: I have my projects in a version control system (like SVN or Git) and have a checkout per build platform

问题 In my case I want to take photo or capture video, actually I can do these if I create separate intents. I mean I can open camera as image mode or video mode but can not switch between them. Is this related to intent filters which I use? What should I do? How do I switch between them? 回答1: I had the same problem. I did a surface view and an Activity for a photo camera after I thought put a button to record a video in the same Activity with the same surface view but I don´t know if it was

问题 I intend to run several commands on remote host using paramiko, but the ssh session closed after running a command. The code listed below: from paramiko import SSHClient import paramiko ssh = SSHClient() ssh.load_system_host_keys() ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy()) ssh.connect(host, 22, user, passwd, timeout=3) stdin, stdout, stderr = ssh.exec_command('uname -a') So is there any way to stop the ssh session from closing? Or any alternatives for paramiko? Update : I was