bandwidth

问题 I'm on android and I have a problem with firebase. I was just checking my bandwitch with the cmd windows and I found out that if I add a new data to firebase, insteads of uploading the local caches it downloads all the data. I have the persistence enabled so it shouldn't be doing that. I have this configuration : So basically a key with article in it. I am just going to add one from the browser and load it on my phone. I run firebase database:profile on my cmd windows and load it on my phone

问题 Is it possible to switch bandwidth manually when streaming Video in HLS? I mean Video on demand, not live video. HLS: http://en.wikipedia.org/wiki/HTTP_Live_Streaming It look like youtube switching quality. And there is commercial product: http://www.longtailvideo.com/support/forums/jw-player/using-playlists/32487/hls-playlist/ 回答1: You can, as long as you control the player and the feeding logic to the player, which includes downloading the content, determining the right bit rate stream etc.

问题 I am tasked with writing a client-side data download system (on Linux) that uses FTP or HTTP to download terabyte-sized data from external partners to our local site. Our company's network admin tells me that I cannot exceed a certain bandwidth. What is the best way for me to implement such a system? Do existing libraries exist? I am open to writing my own FTP and HTTP clients (in either C or Java on Linux) but would prefer to stay out of the kernel. I know that I can limit the rate at which

问题 According to the definition of the bandwidth, it is the width of the frequency spectrum. Hence bandwidth should be measured in Hz. But bps, Mbps, kbps have been used as the measurement of bandwidth almost everywhere. What I need to know is, why bps, kbps kind of measurements of data transmission rate are used to measure the bandwidth of a signal. 回答1: Throughput, measured in bps, Mbps, Kbps, is mistakenly referred to as bandwidth because of a mis-conception of the Shannon-Hartley law. The

问题 I found this great script to download and protect the files from a directory: http://www.gowondesigns.com/?page.getfile And I saw this code from a website too: // local file that should be send to the client $local_file = 'test-file.zip'; // filename that the user gets as default $download_file = 'your-download-name.zip'; // set the download rate limit (=> 20,5 kb/s) $download_rate = 20.5; if(file_exists($local_file) && is_file($local_file)) { // send headers header('Cache-control: private');

问题 As part of an algorithm profiling running on GPU I feel that I'm hitting the memory bandwidth. I have several complex kernels performing some complicated operations (sparse matrix multiplications, reduction etc) and some very simple ones and it seems that all (significant ones) hit ~79GB/s bandwidth wall when I calculate the total data read/written for each one of them, regardless the complexity of them, while the theoretical GPU bandwidth is 112GB/s (nVidia GTX 960) The data set is very

问题 How to limit speed of outgoing response from php script? So I have a script generating data in keep-alive connection. It just opens file and reads it. How to limit outgoing speed (By now i have such code) if(isset($_GET[FILE])) { $fileName = $_GET[FILE]; $file = $fileName; if (!file_exists($file)) { print('<b>ERROR:</b> php could not find (' . $fileName . ') please check your settings.'); exit(); } if(file_exists($file)) { # stay clean @ob_end_clean(); @set_time_limit(0); # keep binary data

问题 I run a hosted service and I need to be able to monitor how much bandwidth every customer (Who uses an individual subdomain, created through cPanel) consumes. Is there some way to trigger a PHP script to run when a subdomain reaches a certain amount of bandwidth? If this isn't an existing solution (I would guess as perhaps part of one of the statistic modules that already exist like Webalizer) then can I have some suggestions on what it should be written in? 回答1: I'd like to apologize in

问题 Nvidia has offered an example about how to profile bandwidth between Host and Device, you can find codes here: https://developer.nvidia.com/opencl (search "bandwidth"). The experiment is carried on in an Ubuntu 12.04 64-bits computer. I am inspecting pinned memory and mapped accessing mode, which can be tested by invoke: ./bandwidthtest --memory=pinned --access=mapped The core test loop on Host-to-Device bandwidth is at around line 736~748. I also list them here and add some comments and

问题 In paperclip when you save an image with lots of style and sizes it also saves the original. But in my app it's not necessary to save the original, just the style will do, what I was wondering was how do you not save the original. Just store it in memory or in a temporary area and then not save it once the style have been generated. Ideally it would not save original at all. I guess one solution would be to save the original, process the style and delete afterwards, however I'm trying to save