Can anyone please tell me whether its possible to have p2p like downloading of rpm from repository
The problem is that for torrents it takes quite some time to start downloading a file (find peers, who has the file). This is inefficient for small files (average rpm has 800kB). Debian done that and it is not a popular form of transport. It is much faster and easier to have sets of mirrors. Using torrents for images is much better and you can download CentOS images using torrents.
Related
I'm new to Unix and trying to get OpenCV running on a Raspberry Pi.
Have copied a file called FindOpenCV from github and installed that in usr/shared/OpenCV and now get a message from the interpreter saying it can't find FindOpenCV.cmakeConfig.cmake.
Been going through the stuff on the internet for 4 days now and no further ahead. Can anyone help a complete beginner please.
Thanks in anticipation.
NeilK
This file should be installed as part of OpenCV installation along with many other files. You need to install OpenCV, not pick random files from the repo. How to do it depends on what OS your Pi board is running.
I migrated my grunt project to ember-cli, I found the time from file modification to liveload completion was so long, about 10 minutes.
After I installed ember-cli-windows, ember-cli-windows-addon, no obvious prompt was gained. The following is one example output after ember-cli-windows, ember-cli-windows-addon installed:
file changed routes\services.js
Build successful - 382781ms.
Slowest Trees | Total
----------------------------------------------+---------------------
Babel | 82175ms
Concat: Vendor | 75980ms
Funnel: App JS Files | 57393ms
JSHint app- QUnit | 49491ms
ES6: App Tree | 41827ms
Slowest Trees (cumulative) | Total (avg)
----------------------------------------------+---------------------
Babel (2) | 82394ms (41197 ms)
Concat: Vendor (1) | 75980ms
Funnel: App JS Files (1) | 57393ms
JSHint app- QUnit (1) | 49491ms
ES6: App Tree (1) | 41827ms
By contrast, the build process can be finished in 2~3 seconds in grunt project after file modification.
I use windows 7.
You ask
Why the ember-cli is so slow
It is not ember-cli per se that is slow, it is Broccoli. Reasons include:
Broccoli copies files instead of symlinking under Windows. To avoid this, run your builds in a command prompt with administrator privileges.
Broccoli is disk-intensive. To solve this, get an SSD.
Broccoli is processor intensive. To solve this, get a faster machine (preferably non-Windows).
Broccoli creates huge numbers of temporary files in tmp, which can slow down performance. To solve this, clean out tmp from time to time.
Broccoli is known to be inherently slow. You can find relevant questions on the broccoli site. To solve this, wait for the broccoli people to address performance issues, which is on their roadmap. Substantial improvements have already been made, so upgrade to the latest version of everything.
Broccoli rebuilds everything over and over again, including things which did not change. To solve this, manually tweak your build process to exclude certain things and do them manually as-needed. For instance, let's say you are bringing in a 200KB external JS package via bower, and app.import'ing it in your Brocfile.js. As a temporary work-around, and to see if it makes a difference, remove that file from the Broccoli world and load it directly in index.html. The same applies to large CSS files.
Broccoli will run babel in a default installation. Babel is not that slow, but it does take time. To solve this, if you are not using ES6 syntax, remove the babel dependency.
Your virus scanner may be trying to scan the thousands of files Broccoli creates. ember-cli-windows deals with this problem only for Defender. If you are using a different anti-virus package, to solve this add your dev directory to its list of places to skip.
For your reference, I have a small Ember project I build in an Ubuntu Virtual Box VM with Windows host on a fast machine with SSD, and builds take 2-3 seconds.
You may also want to consider asking this on an ember-cli list. You could also choose a different framework that does not bake in an immature and inefficient build system.
For windows users, one will need to correctly enable symlinks. As our friends at Microsoft are actually active users of both ember and ember-cli. They have provided an addon that does exactly that.
See: http://ember-cli.com/user-guide/#windows for further details.
For all users see: https://github.com/ember-cli/ember-cli/blob/master/docs/perf-guide.md
[Update]
In the last 6 months several large performance improvements have landed, some are seeing one or two orders of magnitude improvements (obviously this depends on some factors...)
As time permits, more performance improvements are planned, one particular important one is decoupling the need to rely on symlinks or copying. Which should make our windows counterparts (and those with slower drives) quite happy.
For anyone currently feeling like they are seeing less then optimal performance, let me recommend this guide: https://github.com/ember-cli/ember-cli/blob/master/docs/perf-guide.md
Many of the recent improvements have been done in a backwards compatible way, but do require dependencies being upgraded, be sure to upgrade relevant depends, and use that guide to track down any remaining issues and report them.
Windows Subsystem Linux also appears to now work very well!
The best solution for fixing performance issues in windows is running a Ubuntu (or whatever linux you want) in a virtual machine, and running ember serve inside it, using NFS to share folders with host.
I had the exact same problem and I'm getting now sub-second building times. Tried all the solutions found here and in the internet, but without luck. I got 10x performance when I migrated to a Ubuntu VM.
Following this tutorial, I've created my positive samples but need to merge them now, using mergevec. I downloaded the mergevec.exe binary file provided and got the two required dlls cxcore100.dll and highgui100.dll. However, when I run it like so:
mergevec samples.txt samples.vec
it gives me the error:
ERROR: Input file <filename> does not exist or not readable.
What should I do to fix this? My vec files are fine, because I was able to view them using the opencv_createsamples utility. So I know they're fine.
I ran into this issue as well and made a python utility that combines .vec files to avoid installing openCV again: https://github.com/wulfebw/mergevec
Hope it helps.
I was in the same situation as you few days ago so i'll try to help you out =P.
First of all i am interested to know where you found the mergevec.exe, because it isn't available to download anymore if i recall. I ask because i think that you might have downloaded an exe compiled on Linux. I had the same error when i tried to execute the mergevec, i had compiled on Ubuntu, on my Windows computer. Even with the 2 dlls.
As i explained it here , The mergevec from Naotoshi was originally made for Unix distribution, so under windows you will encounter a lot of problems. I first tried to do it on windows but i abandonned because it was too complicated and even with a full Cygwin installation i could not compile the mergevec.cpp.
What i advise you to do is to create yourself an Ubuntu virtual machine and to compile your own mergevec.exe. Once done you can copy your vec files in your virtual machine and merge them under Ubuntu. After this you can bring back the merged vec file to Windows if you want (It is better to not run the training under a VM: less computation power).
Here is what i did:
Installed VMware player with Ubuntu 14.0.4 (although i don't recommend it, still some bugs)
Installed OpenCV from the sources with TBB. There are a lot of tutorials, but the only one that worked for me is the OPenCV website, they are the more accurate on the libraries you mandatorily need.
I downloaded the GitHub classifier training and then I followed the commands given and it worked well.
If you encounter any library problem or OpenCV Installation issue don't hesitate i went through them too.
I am looking for some Links/Tutorials/Examples to Access my Webcam on Linux OS without downloading any packages.
Actually, I am working on a very compact OS (with already removed unnecessary packages).We are space conscious for this project.
I tried OpenCv (on other machine with full OS version) and it worked fine for me but its package is more than 100 Mb and in my project i cant afford that much space. Also, since many packages are already removed from this OS (to make it compact), I am unable to install Opencv on my machine to test it(Because of its missing dependencies).
So I wonder, Is there any other way to access webcam without downloading any packages??
Adding headers/files would be fine in my case.
Any help, suggestion would be really appreciated.
Thanks in advance.
To capture image on linux, without downloading any heavy packages is possible through command line using "uvccapture".UVCCAPTURE is in Kb size. And The two line code can capture image.
for example:
QProcess process
process.execute(/usr/bin/uvccapture -v -m -o"test.jpg");
I am in the process of installing a ColdFusion application on Solaris 10 64-bit (Sparc) running with WebSphere 6.1. The cfcompile script that comes with CF makes a reference to jrun.jar however this library is not available when CF is installed as an ear file. An abstract of cfcompile.sh is the following:
su $cfuser -c "${_JAVACMD} -cp $CLASSES -Dcoldfusion.classPath=$CFUSION_HOME/lib/updates,$CFUSION_HOME/lib -Dcoldfusion.libPath=$CFUSION_HOME/lib coldfusion.tools.CommandLineInvoker Compiler -cfroot $CFUSION_HOME -webinf $WEBINF -webroot $webroot $dir"
Do you see ways to solve this problem (that is to precompile an application), besides installing CF as a standalone running on JRUN server?
Have you checked the contents of the EAR file? There should be a WAR file, in which you'll find WEB-INF/lib. It may be in there. If so, extract it and place it on the classpath.
EAR/WAR file are just zip compressed archives.
This is just a "best guess" on my part.
HTH
Can you install in stand-alone mode on some other temporary location (preferably the same OS & version), and copy jrun.jar to where you want it to be, on the permanent home of the application?
I created my own version of cfcompile.sh on-site to work on the client's infrastructure. The most important part is to have a correct reference to j2ee.jar (found in WAS distribution).