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I know it's not exactly the right place for such a question, but I've seen similar questions to this here, and I don't know any other place where I could ask this, so sorry in advance.
Do you know where I could find a public 3270 server ? I'm working on a telnet emulator and I need one of these servers to test it.
Thanks for your help !
The biggest issue you will face, is not the TELNET/TN3270 part itself, but rather interpreting the 3270 data stream. Anyway, here are some options for you:
efglobe.com provides a public access z/OS system for personal use only. Ask them
on their forum about the kind of testing you intend to perform, to see whether they are
okay with it.
With MVS Turnkey, you can install MVS 3.8J (for which IBM apparently does not
claim copyright) under Hercules emulation. This dates to 1981, so likely lacks newer
protocol innovations since then, but could help you get the basics of the 3270 protocol
right. (MVS 3.8J lacks a TCP/IP stack, so it doesn't directly support TN3270, but
Hercules accepts TN3270 connections and makes them appear as a physical 3270 to MVS.)
IBM will sell you a mainframe emulator running latest IBM mainframe operating
systems on x86 hardware. It will cost you several thousand dollars a year though.
Many institutions used to offer public TN3270 access to library catalogues, but as most libraries have moved off the mainframe, most or all of those seem to have disappeared. In any case, using someone else's system for testing without their knowledge/permission could be ethically and/or legally questionable. You'll still find various organizations have non-public 3270 systems exposed to the Internet, but you won't get past the login screen, and the same comment about legality/ethics applies.
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Actually we have been asked not to use open source databsae. So, Now I have to use proprietary database. Now my doubt is What is best equivalent Proprietary database of postgresql and also it should be cost effective.
Please give some suggestion
The decision maker here has some weird ideas - specifically not open source, but they don't care what you use so long as you don't have the source code? That's nuts.
Maybe they don't understand open source licenses and are confusing GPLv3 with the simple BSD/MIT-like license PostgreSQL is under? They might have images of "open source" meaning some kind of terrible viral license that takes all their patents and forces them to open source all code that it touches (which isn't true even of GPLv3, btw). Try sending them the wikipedia article, FreeBSD's article on the license, and that of OpenBSD. They should also read the OSI FAQ. If they're still determined to waste their money after reading that and doing a little basic research, there's no saving them.
In that case, I would take the PostgreSQL source code, rename it "ProprietaryDB", whack on a restrictive all-rights-reserved license, and sell it to them for $5000/server for a perpetual license. PostgreSQL is under a BSD-like license and you're permitted to do this so long as you don't delete the copyrights from the sources or claim you wrote it. I'll gladly do this for you for as little as $4000/server, a real bargain ;-)
More seriously, there are quite a few proprietary PostgreSQL forks already, notably:
ParAccel
Greenplum Database
EnterpriseDB Postgres Plus Advanced Server
... and Amazon will sell you a ParAccel based DB as a service, Redshift, too.
Amazon RDS PostgreSQL is arguably a closed source fork too, though it tracks mainline PostgreSQL closely and there doesn't seem to be much real difference if any.
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I have looked around for good SSL/TLS libraries that support TLS 1.2
I also want to use this library on an embedded platform so it should be small, easy, secure and free. It should be a c/c++ library.
So far i have come across Cyassl, Polarssl Matrixssl a lot so i think that one of these should be a good choice (Openssl is way too big).
Now i would like to know why people use one over the other.
Thanks
Ok.. Just for starters they all do the same. All three can run on embedded platforms. The difference is where their focus is.
From my personal experience:
PolarSSL has loads of documentation, an understandable API, examples, and gives you the ability to actually delve into the code and understand what is happening. In my experience this is a great plus in case you need to debug a specific issue. They only provide Makefile / CMake / MSVC project files, so the task to include it in your embedded environment is yours.
Cyassl's code is harder to understand and tweak. But they have more pre-made Makefiles for specific development platforms. Depending on your environment this might weigh in (for me it rarely does). In a number of comparisons I did as a subcontractor, they are pricier than PolarSSL though.
Pick MatrixSSL if you don't have budget constraints ;) Definitely the priciest of all and I found no specific reasons to actually use it though in comparison to the alternatives..
With the whole NSA / PRISM thing around: If you want something specifically built in the US, then Cyassl is the best choice. If you want something non-US, PolarSSL is the only sane choice.
So if by free you mean: I'm going to use it in an Open Source project, then price does not matter. The verdict from the community: PolarSSL has good adoption in OpenVPN, Cyassl in MySQL.
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Maybe a strange and green question, however
Is there anything that Nagios or Ganglia can do that the other can't?
In terms of monitoring, alerts in general.
I'm looking for a general solution for my school's computer club, in my mind its like comparing norton vs advast. both are antivirus however are there any specific benefits that one has over the other? Or am I asking a very stupid question now?
thank you.
Ganglia is aimed at monitoring compute grids, i.e. a bunch of servers working on the same task to achieve a common goal - such as a cluster of web servers.
Nagios is aimed at monitoring anything and everything - servers, services on servers, switches, network bandwidth via SNMP etc etc. Nagios will send alerts based on set criteria (ie, you can set it to send yourself an email or if x service dies).
Note that they are not competing products, they are aimed at different scenarios. By the sounds of it, you need Nagios.
If you have a play around with some online demos, you should be able to get a feel for what product you need (and I think you'll agree with me that Nagios is more suited)
Nagios - https://en.wikipedia.org/wiki/Nagios (Wikipedia)
Ganglia - https://en.wikipedia.org/wiki/Ganglia_(software) (Wikipedia)
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I am interested in learning how to write extremely efficient network server software and I don't mind getting my hands dirty with pointers, sockets and threading. I'm talking a server being able to handle thousands of concurrent connections. There is not much processing for each client, but a little.
Do you know of any code examples for really efficient network servers?
Optionally points for small, well documented code that is cross-platform as well.
You'll find a lot of good references and discussion about building highly scalable network servers on Dan Kegel's The C10K problem page.
Have a look at nginx, lighttpd and varnish for some popular high performance http servers.
BTW, I am currently working on combining edge-triggered epoll with multithreading (plus user-level swapcontext-style threads/fibers) - see http://svn.cmeerw.net/src/nginetd/trunk/ for some work-in-progress code (although this one is written in C++).
This may not be exactly what you are looking for, but I briefly recall looking at Space Tyrant a few years back and thinking it sounded cool.
http://librenix.com/?inode=6240
Hope it helps!
Read this
http://www.evanmiller.org/lxr/http/source/
an ldap-server handles lots of transactions per second
http://de.wikipedia.org/wiki/Lightweight_Directory_Access_Protocol
ACE is a wise choice.
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Does any one know of a good text to speech library. It needs to be open source and provide C API?
PS: I've already done a search, but I'd like recommendations from people who have actually used these APIs
Festival is an open source text-to-speech system.
Stanford uses it for their Natural Language Processing class, and they have up-to-date instructions about installation on this cs224s homework page. Installation on Mac OS X requires a couple patches, which they've wrapped into a handy install script.
There are alternate voices you can use which sound noticeably better than the stock ones. You can find information on these voices in this forum post:
How to setup more realistic voices in Festival. Those instructions are for Ubuntu, but the voices work with any Festival installation.
you can go for Festival worked nice for me.
I have used flite in an embedded server. It has a small footprint and comes with a single voice
eSpeak is another lightweight TTS. More robotty than Festival.
Hey what about MARY?
It looks so awesome to me which one should we push further for open source enterprise computer or androids or whatever? We need to strenghten efforts by shifting all open source resources to the best/most promising we have so far.
Anyone experiences with MARY TTS? Or does it have a flaw (because noone mentioned it before)?
More links:
http://www.babelfish.org/tts-free.htm.
https://www.cereproc.com/en/support/live_demo
http://www.digitalfuturesoft.com/dfttssdk.php (also provides ARM version, like MARY + Festival)