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Moe Trin
*nix forums Guru
Joined: 20 Feb 2005
Posts: 972
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 Posted: Tue Jul 11, 2006 1:22 am Post subject:
Re: All new exams added in Testking.co.uk with latest updates and passing guarantee
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On Mon, 10 Jul 2006, in the Usenet newsgroup comp.os.linux.embedded, in article
<e8svua$kbk$1@murphy.mediascape.de>, Michael Schnell wrote:
]All new exams added in Wankers.Website with latest updates and passing
]guarantee
It's just some st00pid spammer crapping in various newsgroups (I saw the
spam in four Linux groups as well as a security newsgroup) trying to rip
off fools. Passing some certification test might help getting past the
HR idiots, but will not help much in any job interview - where the
applicant won't have the first clue how to answer technical questions
posed by the interviewer. That's also why we don't put a certification
requirement in job postings, and rank down applicants who claim such
certification. At best, they've memorized the material needed to pass
some test which generally has no relevance to real world job needs.
Old guy |
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Michael Schnell
*nix forums Guru Wannabe
Joined: 21 Feb 2005
Posts: 110
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| Posted: Mon Jul 10, 2006 7:31 am Post subject:
Re: All new exams added in Testking.co.uk with latest updates and passing guarantee
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??? |
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Daniel Kabs
*nix forums beginner
Joined: 19 Feb 2005
Posts: 14
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| Posted: Thu Apr 20, 2006 10:05 am Post subject:
[HowTo] Getting rid of libstdc++.so (was: g++: minimizing size of libstdc++.so)
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Daniel Kabs wrote:
| Quote: | Is there a way I can use
g++ with a small libstdc++ which includes new() and maybe even exceptions?
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Good news: there's already a small auxiliary library shipping with
gcc/g++ called "libsupc++.a" which contains important C++ features
like new/delete operator, RTTI and exceptions. If can do without STL,
this is the library for you.
Replacing libstdc++.so by libsupc++.so involves two steps:
1. Converting libsupc++.a into a shared library.
2. Recompiling binaries using libsupc++.so
Step one:
'cd' into an empty directory and execute these commands:
$ LIB=$(g++ -print-file-name=libsupc++.a)
$ ar x $LIB
$ g++ -shared -fPIC -nodefaultlibs -lgcc_s *.o -o libsupc++.so
You just created libsupc++.so. The stripped ARM version is
only 67 KByte in size compared to 900 KByte of libstdc++.so 
Copy this library into the directory containing $LIB.
I recommend to move away all static versions of $LIB to make
sure the shared one is used.
Step two:
Compile your programs using the options -nodefaultlibs and -lsupc++
Example:
$ g++ -nodefaultlibs -lsupc++ -lc test.cpp
Cheers
Daniel Kabs
Germany
[x'post & f'up set] |
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Moe Trin
*nix forums Guru
Joined: 20 Feb 2005
Posts: 972
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| Posted: Sun Apr 16, 2006 8:49 pm Post subject:
Re: 1st DigitalTutor.info Tutorial Contest!
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On Sat, 15 Apr 2006, in the Usenet newsgroup comp.os.linux.embedded, in article
<pan.2006.04.15.16.48.06.280351@all.com>, noone wrote:
| Quote: | On Sat, 15 Apr 2006 07:53:23 -0700, info wrote:
Go to http://www.digitaltutor.info & send us your tutorial to participate!
We are looking for Programming, Linux, 3D and Video Editing Tutorials.
hmmm.
and I wonder who gets the rights to your tutorial once it is submitted?
Sounds like someone is preparing a book and is looking for material.
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either that or harvesting addresses. The idiot posted the same crap to
linux.redhat, comp.os.linux.misc, comp.os.linux.networking,
comp.os.linux.setup, and comp.os.linux.security, before posting it here in
comp.os.linux.embedded. I suppose the spammer is to st00pid to realize
that it might be acceptable in comp.os.linux.announce (but then, the
moderator may have just tossed it as spam seeing as how the idiot is
posting from google instead of his ISP's news server). The domain was only
registered on the 11th with GoDaddy, and is hosted on hostnoc - that ought
to be enough clues.
Old guy |
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noone
*nix forums Guru Wannabe
Joined: 20 Feb 2005
Posts: 126
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| Posted: Sat Apr 15, 2006 4:48 pm Post subject:
Re: 1st DigitalTutor.info Tutorial Contest!
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On Sat, 15 Apr 2006 07:53:23 -0700, info wrote:
| Quote: | Prizes:
1st) 12 MegaPixel Digital Camera
2nd) 1 GB Mp4 Video/MP3 Player
3rd) Flexible keyboard
Go to http://www.digitaltutor.info & send us your tutorial to participate!
We are looking for Programming, Linux, 3D and Video Editing Tutorials.
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hmmm.
and I wonder who gets the rights to your tutorial once it is submitted?
Sounds like someone is preparing a book and is looking for material. |
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Peter Dickerson
*nix forums beginner
Joined: 11 Apr 2006
Posts: 2
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| Posted: Tue Apr 11, 2006 11:31 am Post subject:
Re: Building a PHP-lite like Axis
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"tomviolin" <rock_spambust_violin@yahoo.com> wrote in message
news:1144750498.881803.19980@u72g2000cwu.googlegroups.com...
| Quote: | I have found, so far, that to begin to reduce the executable size, it
is necessary to go into the Makefile and eliminate references to
specific .c files. However, some files, such as functions/info.c,
which provides the phpinfo() function, contain functions that are used
elsewhere, and require modifications to other files. I've spent
several hours and only got the executable down to around 1.6 meg.
There doesn't seem to be a "magic" way to do this, one apparently just
has to dig in.
I wonder if later releases of PHP might have been written in a more
modular fashion, and thus be easier to reduce. If I can get a version
of PHP, that at least has some basic functionality, with an exectuable
under 1 MB, I'll be happy.
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gcc has the (non-default) ability to compile each function and data
declaration into a separate section. Combining that with linking that
removes unreferenced sections can reduce your workload. I doesn't matter if
the code is in the same file - if it isn't referenced then it doesn't get
pulled in, and if it doesn't get pulled in it does pull other stuff in. This
has worked well for me on a few embedded projects.
Look up -ffunction-sections -fdata-sections for compiling and
-Wl,--gc-sections for linking.
Peter |
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tomviolin
*nix forums beginner
Joined: 06 Oct 2005
Posts: 10
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| Posted: Tue Apr 11, 2006 10:14 am Post subject:
Re: Building a PHP-lite like Axis
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I have found, so far, that to begin to reduce the executable size, it
is necessary to go into the Makefile and eliminate references to
specific .c files. However, some files, such as functions/info.c,
which provides the phpinfo() function, contain functions that are used
elsewhere, and require modifications to other files. I've spent
several hours and only got the executable down to around 1.6 meg.
There doesn't seem to be a "magic" way to do this, one apparently just
has to dig in.
I wonder if later releases of PHP might have been written in a more
modular fashion, and thus be easier to reduce. If I can get a version
of PHP, that at least has some basic functionality, with an exectuable
under 1 MB, I'll be happy. |
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Captain Dondo
*nix forums Guru Wannabe
Joined: 28 Feb 2005
Posts: 250
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| Posted: Mon Apr 10, 2006 3:41 am Post subject:
Re: Building a PHP-lite like Axis
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On Sun, 09 Apr 2006 10:29:52 -0700, tomviolin wrote:
| Quote: |
What I am observing is that, even though I have, for example, disabled
MySQL support, the mysql.c file is still compiled into mysql.o, and it
is still linked into the php executable. This seems to indicate that
in order to substantially reduce the size of the executable, some
serious hacking will be required.
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I've not looked into the PHP build scripts, but which version are you
trying to build? ISTR that PHP 4 built up to about 800K out of the box
once you eliminate all of the fluff, while PHP 5 built to something like
2.5 MB...
Typically most of the 'hacking' needed is in the build scripts...
--
o__
,>/'_ o__
(_)\(_) ,>/'_ o__
Yan Seiner, PE (_)\(_) ,>/'_ o__
Certified Personal Trainer (_)\(_) ,>/'_ o__
Licensed Professional Engineer (_)\(_) ,>/'_
Who says engineers have to be pencil necked geeks? (_)\(_) |
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Michael Schnell
*nix forums Guru Wannabe
Joined: 21 Feb 2005
Posts: 110
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| Posted: Mon Mar 27, 2006 5:36 am Post subject:
Re: Best Linux distribution for a Mini-ITX server?
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| Quote: | Excuse me: that's not what I meant. . I don't dispute that a 64-bit AMD CPU
may match a 32-bit Intel CPU in speed and 32-bit performance. But why not
enable the extra features, especially if you're doing graphics or floating
point processing? More bits tends to really help graphical and number
crunching performance, and if it's not too tough to get the operations
converted to 64-bit, it can take a bit of work, but go for it!
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Is it possible to run 64 Bit user programs in a 32 Bit OS ? (The OS
needs to save the 64 bit registers when scheduling ...)
-Michael |
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ray
*nix forums Guru
Joined: 20 Feb 2005
Posts: 1127
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| Posted: Tue Mar 21, 2006 11:13 pm Post subject:
Re: Best Linux distribution for a Mini-ITX server?
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On Tue, 21 Mar 2006 15:57:53 -0500, Lew Pitcher wrote:
| Quote: | -----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
ray wrote:
I prefer X manager - it works pretty well, allows multiple X sessions, and
the eval copy handles my needs.
To each his own, I guess
I prefer Xming. It too allows multiple X sessions (rootless, if I want),
and it is FOSS, licenced under the GPL.
- --
Lew Pitcher, IT Specialist, Corporate Technology Solutions,
Enterprise Technology Solutions, TD Bank Financial Group
(Opinions expressed here are my own, not my employer's)
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Version: GnuPG v1.4.2.2 (MingW32)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org
iD8DBQFEIGjRagVFX4UWr64RAozHAJ9ODO9LGW5FZCwCxnv6xcxoXmpf6QCfZgiy
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Thanks for the reference - I'll see if I can find time to try it out in
the near future. It has been several years since I did an exhaustive
comparison; at that time, I tried basically everything I could find -
mostly those referred from Kenton Lee's X/Motif page. I found that most of
the 'free' packages were quite slow - several were Java based. |
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Roedy Green
*nix forums Guru Wannabe
Joined: 16 Aug 2005
Posts: 242
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| Posted: Sun Mar 05, 2006 10:38 pm Post subject:
Re: looking for performance statistics (native JAVA processors)
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On Sun, 05 Mar 2006 12:31:28 -0500, noone <noone@all.com> wrote,
quoted or indirectly quoted someone who said :
| Quote: | I guess what I'm really wondering is whether there are java native
processors out there that can approach risc mips levels.
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the intent of a Java processor would to conserve RAM. It could run as
an interpreter without chewing up megabytes of RAM with the machine
language equivalents.
Sun abandoned its PicoJava chips when it turned out they ran too hot.
You need a low power chip for a hand held.
Have a look at http://mindprod.com/jgloss/picojava.html
I have always wanted to see a machine with a cached stack with a
mindless little processor that worked in parallel using spare memory
cycles to keep the stack from overflowing and to keep it filled.
--
Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching. |
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Thomas Hawtin
*nix forums beginner
Joined: 30 Jan 2006
Posts: 2
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| Posted: Sun Mar 05, 2006 8:04 pm Post subject:
Re: looking for performance statistics (native JAVA processors)
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noone wrote:
| Quote: |
Does anyone have references to performance stats or whitepapers about
performance of native java processors vs. software jvm for embedded apps?
I read the hardware specs on a couple of 100mhz processors and they didn't
seem very impressive, even for running bytecode in hardware. One spec
showed a benchmark of copying a 10,000 byte array in 64ms. On the surface
that seems fast but consider that 10000/0.064secs=1.25mbits/sec. and they
include an ethernet tranceiver on the eval board. I haven't used a 1mb/s
ethernet in nearly 15 years!
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640 cycles per iteration. Running interpreted on my desktop machine
gives around 200 cycles per iteration. However, CLDC (and even RTSJ)
have block copying methods which will presumably be written natively.
| Quote: | I guess what I'm really wondering is whether there are java native
processors out there that can approach risc mips levels. I
understand that there will be emulation overhead even in hardware but my
requirements will be to keep up with 802.11b wireless speeds: 11bm/s.
Anyone know of java native processors that can deliver that kind of
thru-put and support the FULL J2ME specs?
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ARM processors with Jazelle can execute Java byte code directly at a
reasonable pace. They also support Ahead-Of-Time (AOT) compilation for
speed critical parts.
http://www.arm.com/products/esd/jazelle_home.html
http://www.arm.com/linux/
Tom Hawtin
--
Unemployed English Java programmer
http://jroller.com/page/tackline/ |
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brenda
*nix forums beginner
Joined: 08 Feb 2006
Posts: 1
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| Posted: Wed Feb 08, 2006 6:34 am Post subject:
Re: specint question
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Hi,
I know you are not supposed to compare SpecInt2000 with SpecInt 95
But if I had to what would be a good rule of thumb.
We are trying to compare 2 boards one uses SpecInt 2K and the other
SpecInt95. How can we compare them? |
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Niklas Holsti
*nix forums beginner
Joined: 25 Jan 2006
Posts: 1
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| Posted: Wed Jan 25, 2006 11:14 am Post subject:
Re: factors affecting context switch time
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vivekian wrote:
| Quote: | Also , another question -- maybe should post it as a different thread
.. There are some lines of C++ code for which the number of clock
cylces has to be measured. At present using RDTSC instruction. Is there
some way to make sure that the code runs uninterrupted so that a true
picture is available ? Or is there some tool available to measure how
much time the code takes to run ?
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[ I limited this post to the "embedded" and "realtime" groups. ]
You can find some references to some such tools at
http://www.tidorum.fi/bound-t/timing-tools.html. Don't know if
they are exactly the kind of thing you need, though; mostly they
are aimed at smaller systems with small real-time kernels.
--
Niklas Holsti
Tidorum Ltd
niklas holsti tidorum fi
. @ . |
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Stephen O
*nix forums beginner
Joined: 21 Jul 2005
Posts: 11
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| Posted: Fri Aug 05, 2005 12:32 pm Post subject:
Re: Military or Commercial Aircraft Navigation
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Linux is only be a problem on higher criticality platforms, if you are
familiar with D0-178B, level C and higher most likely can not use linux
because it is not partitionable, or adhere to certain ARINC standards.
On level D, or level E platforms, linux can be used.
Depending upon which avionics systems you are talking about some can
take 1-2 minutes to complete boot up. I know radios and displays are
generally faster, but hey have higher criticality applied to them
therefore the requirements for a quick boot are more stingent.
One thing you may want to look into is how critical the system in
question is and develop some use cases and requirements. Depending upon
how your system is used and what it's requirements are you may not need
a quick boot time, or 30-seconds may be sufficient in which case linux
could most certainly be used. |
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