Re: How can I use D to develop web application?
On Tue, Sep 13, 2011 at 7:08 PM, Andrew Wiley wiley.andre...@gmail.com wrote: On Tue, Sep 13, 2011 at 8:54 PM, zsxxsz zsx...@263.net wrote: == Quote from Adam Ruppe (destructiona...@gmail.com)'s article zsxxsz wrote: The fork process is expensive for any OS. Have you actually measured this? Yes, I'm sure. Fork on UNIX or CreateProcess on Win32 are expensive. Interestingly enough, this benchmark conducted ~10 years ago on a Pentium 3 found that Fork took less than a millisecond on Linux 2.6: http://bulk.fefe.de/scalability/ Fork creates a child process with an copy of the parent process. Yes, this is very fast on any decent operating system. For cgi to work I am pretty sure you have to call execve which transform a process into another process. That link doesn't measure performance for execve...
Re: How can I use D to develop web application?
Thank you very much. I think the cgi module is lower effecient. I found
fcgi(http://www.dsource.org/projects/fastcgi4d) and
mango(http://www.dsource.org/projects/mango) which support servlet. But they
don't
support D2, anyone else can merge them to D2?
zsxxsz
I've some D2 code working with fastcgi. It accepts some web request,
makes live a screenshot of my environment, converts it to png, and sends
it back.
basically it's an own implementation of the fastcgi protocol. but I
think I haven't yet covered all of it. But it's sufficant for me
/*
* main
*/
int main(char[][] args)
{
// init
FcgiApplication fastcgi = new FcgiApplication();
// listen
fastcgi.listen(8080);
// redirection
fastcgi.accept(/redirect.html, (FcgiRequest request)
{
request.redirect(http://www.google.de;);
});
// dir
fastcgi.accept(/users.html, (FcgiRequest request)
{
request.send(a href=\/\back/a);
request.send(directory!);
string dir = std.process.shell(ls /etc);
request.send(pre ~ dir ~ /pre);
});
// counter
int counter = 0;
fastcgi.accept(/lukas.html, (FcgiRequest request)
{
counter++;
request.send(hello world! ~ to!string(counter));
});
// show all variables
fastcgi.accept((FcgiRequest request)
{
request.send(table);
foreach(key, value; request.params) {
string html = std.string.format(trtd%s/td
td%s/td/tr,
key, value);
request.send(html);
}
request.send(/table);
});
// wait until forever
return fastcgi.exec();
}
How can I use D to develop web application?
I find D is a excellent program lang. I usualy use C/C++, sometime using Java/Php. I hate C/C++ for its lowerly effecient development, and I have Java/Php for it virtual machine. So, I love D very much. But when I want to write some web program, I can't find any useful resources. Anybody else can tell me libraries for web applications? Thanks zsxxsz
Re: How can I use D to develop web application?
https://github.com/adamdruppe/misc-stuff-including-D-programming-language-web-stuff cgi == Quote from zsxxsz (zsx...@263.net)'s article I find D is a excellent program lang. I usualy use C/C++, sometime using Java/Php. I hate C/C++ for its lowerly effecient development, and I have Java/Php for it virtual machine. So, I love D very much. But when I want to write some web program, I can't find any useful resources. Anybody else can tell me libraries for web applications? Thanks zsxxsz
Re: How can I use D to develop web application?
== Quote from sclytrack (sclytr...@idiot.com)'s article https://github.com/adamdruppe/misc-stuff-including-D-programming-language-web-stuff cgi == Quote from zsxxsz (zsx...@263.net)'s article I find D is a excellent program lang. I usualy use C/C++, sometime using Java/Php. I hate C/C++ for its lowerly effecient development, and I have Java/Php for it virtual machine. So, I love D very much. But when I want to write some web program, I can't find any useful resources. Anybody else can tell me libraries for web applications? Thanks zsxxsz Thank you very much. I think the cgi module is lower effecient. I found fcgi(http://www.dsource.org/projects/fastcgi4d) and mango(http://www.dsource.org/projects/mango) which support servlet. But they don't support D2, anyone else can merge them to D2? zsxxsz
Re: How can I use D to develop web application?
zsxxsz wrote: I think the cgi module is lower effecient. That's not really true. The reason CGI has a perception of being slow is because it's used by slow languages most the time, but with D, it's fast. That said, if you still want to use fast cgi, just use -version=fastcgi when compiling with that same module.
Re: How can I use D to develop web application?
== Quote from Adam Ruppe (destructiona...@gmail.com)'s article zsxxsz wrote: I think the cgi module is lower effecient. That's not really true. The reason CGI has a perception of being slow is because it's used by slow languages most the time, but with D, it's fast. I don't think so. Because I've been using C to write cgi. One http request one fork cgi which is the reason of slowly performance cgi. The fork process is expensive for any OS. That said, if you still want to use fast cgi, just use -version=fastcgi when compiling with that same module. I feel the cgi library is too simple, so I doubt wether it supports fcgi for Apache, Nginx or other Webserver.
Re: How can I use D to develop web application?
zsxxsz wrote: The fork process is expensive for any OS. Have you actually measured this? I feel the cgi library is too simple, so I doubt wether it supports fcgi for Apache, Nginx or other Webserver. Have you actually looked at it? I've personally used it on three web servers (IIS, Apache, and an embedded server) across two operating systems (Windows and Linux) and three protocols (CGI, FastCGI, and raw http). It'll probably work on other servers and operating systems too, but I haven't tried yet.
Re: How can I use D to develop web application?
Thank you very much. I think the cgi module is lower effecient. I found fcgi(http://www.dsource.org/projects/fastcgi4d) and mango(http://www.dsource.org/projects/mango) which support servlet. But they don't support D2, anyone else can merge them to D2? Why don't you port them yourself?
Re: How can I use D to develop web application?
zsxxsz zsx...@263.net wrote in message news:j4o0nn$2igh$1...@digitalmars.com... == Quote from Adam Ruppe (destructiona...@gmail.com)'s article zsxxsz wrote: I think the cgi module is lower effecient. That's not really true. The reason CGI has a perception of being slow is because it's used by slow languages most the time, but with D, it's fast. I don't think so. Because I've been using C to write cgi. One http request one fork cgi which is the reason of slowly performance cgi. The fork process is expensive for any OS. Accessing a DB, using JS, and sending a page across the internet are all far, far slower than forking.
Re: How can I use D to develop web application?
== Quote from Adam Ruppe (destructiona...@gmail.com)'s article zsxxsz wrote: The fork process is expensive for any OS. Have you actually measured this? Yes, I'm sure. Fork on UNIX or CreateProcess on Win32 are expensive. I feel the cgi library is too simple, so I doubt wether it supports fcgi for Apache, Nginx or other Webserver. Have you actually looked at it? I've personally used it on three web servers (IIS, Apache, and an embedded server) across two operating systems (Windows and Linux) and three protocols (CGI, FastCGI, and raw http). It'll probably work on other servers and operating systems too, but I haven't tried yet. Is so, I'll try it, thanks.
Re: How can I use D to develop web application?
== Quote from Trass3r (u...@known.com)'s article Thank you very much. I think the cgi module is lower effecient. I found fcgi(http://www.dsource.org/projects/fastcgi4d) and mango(http://www.dsource.org/projects/mango) which support servlet. But they don't support D2, anyone else can merge them to D2? Why don't you port them yourself? Yes, I want to port them from now on, maybe write another one. The projects's owner port them is the best way, because they are more familer with there programs.
Re: How can I use D to develop web application?
== Quote from Nick Sabalausky (a@a.a)'s article zsxxsz zsx...@263.net wrote in message news:j4o0nn$2igh$1...@digitalmars.com... == Quote from Adam Ruppe (destructiona...@gmail.com)'s article zsxxsz wrote: I think the cgi module is lower effecient. That's not really true. The reason CGI has a perception of being slow is because it's used by slow languages most the time, but with D, it's fast. I don't think so. Because I've been using C to write cgi. One http request one fork cgi which is the reason of slowly performance cgi. The fork process is expensive for any OS. Accessing a DB, using JS, and sending a page across the internet are all far, far slower than forking. I've make a test that forking 1000 processes to execute 1000 tasks on Linux, which cost my all CPU and the load average is high. But when use thread pool to execute these same 1000 tasks, the CPU cost and load average are more slower.
Re: How can I use D to develop web application?
On Tue, Sep 13, 2011 at 8:54 PM, zsxxsz zsx...@263.net wrote: == Quote from Adam Ruppe (destructiona...@gmail.com)'s article zsxxsz wrote: The fork process is expensive for any OS. Have you actually measured this? Yes, I'm sure. Fork on UNIX or CreateProcess on Win32 are expensive. Interestingly enough, this benchmark conducted ~10 years ago on a Pentium 3 found that Fork took less than a millisecond on Linux 2.6: http://bulk.fefe.de/scalability/
Re: How can I use D to develop web application?
On Wed, Sep 14, 2011 at 12:04 PM, zsxxsz zsx...@263.net wrote: == Quote from Nick Sabalausky (a@a.a)'s article zsxxsz zsx...@263.net wrote in message news:j4o0nn$2igh$1...@digitalmars.com... == Quote from Adam Ruppe (destructiona...@gmail.com)'s article zsxxsz wrote: I think the cgi module is lower effecient. That's not really true. The reason CGI has a perception of being slow is because it's used by slow languages most the time, but with D, it's fast. I don't think so. Because I've been using C to write cgi. One http request one fork cgi which is the reason of slowly performance cgi. The fork process is expensive for any OS. Accessing a DB, using JS, and sending a page across the internet are all far, far slower than forking. I've make a test that forking 1000 processes to execute 1000 tasks on Linux, which cost my all CPU and the load average is high. But when use thread pool to execute these same 1000 tasks, the CPU cost and load average are more slower. You're better off being event based than either of these options, fork per request is broken but so is thread per request.
