Comments for /contrib/famzah

Comment on 2G GPRS vs. 3G UMTS connection battery usage on mobile phones by Ivan Zahariev

Ivan Zahariev — Fri, 03 Sep 2010 16:17:33 +0000

Stationary. The signal level meter on my phone shows maximum reception.

Comment on 2G GPRS vs. 3G UMTS connection battery usage on mobile phones by Jacob

Jacob — Fri, 03 Sep 2010 16:09:35 +0000

did you do this will moving? or were you stationary????

Comment on C++ vs. Python vs. Perl vs. PHP performance benchmark (part #2) by Ivan Zahariev

Ivan Zahariev — Tue, 31 Aug 2010 13:12:16 +0000

Hey, I’m glad that you could use this in your research.

The calls in Linux are divided in two main parts – user-space and kernel-space (system) calls. The system calls are much less as a count, and you could do some sort of comparison there. I suppose that the “high-level” languages accumulate system-calls CPU time by making too many memory operations; but that’s just shooting in the dark.
The user-land calls are way too many and I’m not very optimistic, that you can summarize and compare the results.

If you find out something interesting, please post it here, or give us a link, so that other people can read about it too.

Comment on C++ vs. Python vs. Perl vs. PHP performance benchmark (part #2) by Nadav

Nadav — Tue, 31 Aug 2010 12:47:30 +0000

Hello,
My name is Nadav and I am a PhD candidate researching compiler optimizations. I like your comparison because it gives a pretty good estimate as to what overhead we see when benchmarking applications. It would be interesting to look at the call graph and see where time is spent.

Comment on C++ vs. Python vs. Perl vs. PHP performance benchmark (part #2) by SuperKoko

SuperKoko — Wed, 25 Aug 2010 22:44:17 +0000

With GCC 4.1.2 and GLIBC 2.9, kernel 2.6.30:
Launching a “hello world” program 5000 times (output to /dev/null) on a 2.67Ghz Pentium IV:

Perl 5.8.8: 15.4 seconds
C++ dynamically linked executable: 11.3 seconds
C++ statically linked executable: 1.13 second
C dynamically linked executable: 2.2 seconds
C statically linked executable: 0.64 second
C statically linked with dietlibc: 0.25 second

1) Dynamically linking is slow to start up.
2) C++ contains much startup overhead.
3) kernel’s fork/exec overhead is very low for simple programs.
4) Dietlibc start up is very fast.

Comment on 2G GPRS vs. 3G UMTS connection battery usage on mobile phones by Anonymous

Anonymous — Mon, 23 Aug 2010 16:56:55 +0000

Nice analysis

Comment on Running Debian on Bifferboard by Ivan Zahariev

Ivan Zahariev — Sun, 22 Aug 2010 16:27:38 +0000

You can install Java runtime on your Debian very easily by executing the following:

apt-get install sun-java6-bin sun-java6-jre

You already started a thread about Java at the Bifferboard mailing list and as suggested there, you can also try JamVM, which is a lighter Java runtime implementation, by executing:

apt-get install jamvm

P.S. Please post support inquiries about Debian at the mailing list. I didn't reply in this current thread, because it wasn't about Debian, nor was asked for this OS.

Comment on 2G GPRS vs. 3G UMTS connection battery usage on mobile phones by syedali

syedali — Wed, 18 Aug 2010 13:34:36 +0000

2G GPRS is best for calling while 3G is for data:like 1st gear & top gear!However,future of 3G is unpredictable at present!:syedali

Comment on Running Debian on Bifferboard by Andreas

Andreas — Tue, 17 Aug 2010 19:24:04 +0000

Hi all,

has anyone tried to run Java on a bifferboard? Are there any expierence? Does debian lenny already contain a java installation?

Best regards
Andreas

Comment on Running Debian on Bifferboard by Ivan Zahariev

Ivan Zahariev — Tue, 17 Aug 2010 12:28:55 +0000

You are definitely right. Very often you need swap, even for an apt-get upgrade of “locales”. I’ve added a note about it in the article.