Hi,
...
> Is there any limit lenght of String? I'm using my little tools to convert
> a xxx.htm file to xxx.java (make my life easier).
Only the size of the JVM available memory should be the
limit on the size of a String object.
...
> I tried to use native_threads, but it was "slower" than green threads (I
> don't believe it, and i through i made a mistake). I'm using suse linux
> 6.1. All I have to do to enable native_threads is to use suseconfig and
> set java_threads to green (am i correct??? What wrong???).
...
Don't know much about Suse's config stuff. How does it affect the java
runtime... it is hard for me to tell.
As I understood you are trying to enable native_threads by setting
java_threads to green. This would enable instead green_threads.
A more certain method to switch betwen the two is to call the java
executable with one of -native or -green as first command-line argument:
$ java -native ... normal arguments ...
to use native threads or
$ java -green .... normal arguments ...
to use green threads.
An equivalent alternative way is to export an THREADS_TYPE environment
variable wich needs be set to either "native" or "green" before calling
the java executable.
$ THREADS_TYPE=native ; export THREADS_TYPE
$ java ... normal java arguments ...
As I remember these can be done in Apache JServ, with proper
httpd.conf parameters.
-----------------------------------------------------
The benchmarking figures still arent a solid base to commit web
application development to one programming language or another.
Specially because even with that benchmark tests similar performance -
PHP is somewhere 10-25% faster than servlet in that particular
OS/Web server configuration. We tested JIT JVMs on NT, and noticed them
being twice to ten times faster than blackdown java implementation on
Linux.
Just because a Sun JIT for linux isnt yet available, should not
be the main reason to avoid servlets.
I'll gladly run some tests (benchmarks) on this issue too
when/if I'll have time.
Bye,
Cezar
On Mon, 26 Jul 1999, C.P. Lau wrote:
> > ----------------------------------------------------------
> >
> > Also, if you use JDK1.1.7 make sure you use native_threads instead of
> > green_threads - even somewhere within JServ sources is stated that
> > the green_threads IO is blocking *all* concurent threads
> > doing IO during networking reads, that may seriously affect multithreading
> > servlet performance.
> > ------------------------------------------------------------
>
> >
> > In order to consider JMeter as a fair measurement tool it needs to:
> >
> > - be *much* faster than the server it tries to measure the performance.
> > Some servers are so fast that the results of jmeter (or other
> > web-benchmark tool) measure only the speed at wich JMeter *itself*
> > is able to send requests to and receive replies from that server.(!!!)
>
> Then why I don't have the same result for php?
>
> > - run it from multiple client machines to make sure you fully stress
> > one server engine. Add the results from multiple JMeter(s)
> > - must not run on the same computer as the web (servlet, php) server.
> > JMeter has its own cpu% demands, possibly high, that will
> > alter the result of the benchmark, by taking CPU cycles from the
> > server process it benchmarks!!
> > Considering that both JMeter and servlet engine are used for
> > similar task (multithreaded Java networking) AND at the same time
> > JMeter uses AWT GUI for realtime displays, how can you be sure that JMeter
> > itself isnt an limiting factor in measuring a server's performance?
>
> I did the test on two machine.
>
> > (I'm interested also in what Apache-JMeter developers answer at this
> > question, if they receive messages from this servlet-interest list)
> >
>
> Poor me, I'm now learning php hard (I don't want it).
>
> > ---------------
> > Bye,
> > Cezar.
> > ------------------------
> > "Contrary to popular belief, penguins are not the salvation of modern
> > technology. Neither do they throw parties for the urban proletariat."
> >
> > On Mon, 19 Jul 1999, Alvin, lau wrote:
> >
> > > >What are the results jswdk vs. jserv+apache on the same JVM (blackdown) ?
> > > you can see the result at
> > > http://achilles.stachanov.com/~alvin/lab/phpvsservlet/
> > >
> > >
> > > >More questions, more details please:
> > > >The error occurs within jmeter or at the servlet side?
> > >
> > > I cannot remember. I reinstalled blackdown jdk and glibc 2.0, so I cannot do
> > > that test again.
> > >
> > > >Try to use other jdk than ibm's for jmeter.
> > > yes, I tried (blackdown jdk1.1.7), and it worked.
> > >
> > > >Are you running jmeter on a different machine?
> > > >(otherwise the jmeter itself will alter the result of the benchmark).
> > > yes, i'm using the same machine.
> > >
> > >
> > > >Thanks,
> > > >Cezar.
> > > >
> > > >On Mon, 19 Jul 1999, Alvin, lau wrote:
> > > >
> > > >> hi,
> > > >>
> > > >> I spent almost 4 hrs to setup ibm vm (because I have to upgrade my
> > > glibc).
> > > >> After that, I started to do the test again. This time, I got an exception
> > > >> from jmeter and some error in my jserv's log. I tried to use jswdk
> > > instead
> > > >> of jserv, I still got that exception(I forget the name). I didn't have
> > > any
> > > >> problem when I used ie/ns to request that page and I didn't have any
> > > problem
> > > >> when I used blackdown jdk1.1.7. Why? Is there anyone using IBM VM, jserv
> > > on
> > > >> a linux box (suse 6.1)? It seems that IBM VM has some problems when a
> > > >> servlet is requested simultaneously or intensely.
> > > >>
> > > >> I am trying to ask some members of my team to use servlet, I need some
> > > >> figures to show that servlet is better. I do think servlet is better. But
> > > >> the fact is that they want to see. I cannot tell them if we use an
> > > expensive
> > > >> machine, then servlet is better. How can I ask them to use servlet on a
> > > big
> > > >> project when it doesn't handle a small project well.
> > > >>
> > > >> I'm going to do another test. And I hope this time java will win.
> > > >>
> > > >> rmi->servlet(apache, jserv)->client
> > > >> php(apache)->php(apache)->client
> > > >>
> > > >> I will post the results here when i finish.
> > > >>
> > > >> alvin
> > > >>
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