Revserver / Dreamhost question

[Andre Garzia]

Mike,

There is some confusion in there. RevServer engine and 3.5 engine are
different things. While if you configured your apache correctly you can make
it invoke one engine or the other depending on your choices, on my server I
have .irev files mapped to RevServer and .CGI files mapped to whoever runs
them (usually a she-bang line on top).

RevServer engine has more features than 3.5 engine. It allows you to mix and
match RevTalk and HTML, so things like this become possible:

<h1>Count from 1 to 10</h1>
<table>
<?rev
repeat with x = 1 to 10
?>
<tr>
  <td>
  <?rev
    put x
  ?>
  </td>
</tr>
<?rev
end repeat
?>
</table>

Such construct is not possible with 3.5 engine. Also RevServer has the cool
$_POST and $_GET globals that parse the CGI stuff for you. With 3.5, you
need to do all this parsing by hand. RevServer has additional commands such
as "put [new] header" for sending HTTP headers and is able to include
additional files with the include command. All of those are not available to
3.5 engine.

Hope this helps
andre

On Fri, Aug 13, 2010 at 1:40 PM, Michael Kann <mikekann at yahoo.com> wrote:

> Richard and Stephen,
>
> I'm still confused as to the difference between using revServer and using
> the 3.5 engine. My mental model is that when the apache webserver sees a
> script with an irev extension it sends it over to the 3.5 engine to parse
> it. The 3.5 engine sends back some html to push out the door to the browser
> in Glendale. Apache and the 3.5 engine work together to allow us to use irev
> scripts. Does the revServer work with Apache to do the same thing?
>
> In short, why RevServer instead of the 3.5 engine?
>
> Mike
>
>
>
>
>
> --- On Fri, 8/13/10, Richard Gaskin <ambassador at fourthworld.com> wrote:
>
> From: Richard Gaskin <ambassador at fourthworld.com>
> Subject: Re: Revserver / Dreamhost question
> To: "How to use Revolution" <use-revolution at lists.runrev.com>
> Date: Friday, August 13, 2010, 11:10 AM
>
> stephen barncard wrote:
>
> > 1.  If I want to use my own Revserver instance at Dreamhost, would I have
> to
> > get a 'Personal Server' account?  I understand my shared hosting can't be
> > used for this. Has anyone here done this?
>
> Shared hosting should be fine.   Just like the older Rev CGI engine, the
> only limits you'll run into with RevServer are those imposed by the hosting
> company for shared accounts, which should be fine for most uses.
>
> Hosts will vary in how they limit resource consumption to prevent a single
> account from dominating a shared CPU.  For example, on-rev.com, TierraNet,
> and others limit processes to 30 seconds, while Dreamhost limits them to
> about 300 aggregate minutes per day.
>
> Which is "better" will depend on your needs (and if you ran a single
> process for 300 consecutive minutes you'd likely get a letter from Dreamhost
> asking why you need to do that <g>).  But no matter which specific limits
> are used by the host, most CGIs will run quite well within them.  Very few
> on-rev.com customers have run into these limits themselves, and I run a
> lot of CGIs on TierraNet, Dreamhost, and others and have never come even
> close them at all.
>
> As many here have noted, 30 seconds is a very long time to run a continuous
> process.  With my CGIs I target a maximum of 5 seconds and may in some
> extreme cases tolerate up to 10 seconds if absolutely unavoidable, but even
> that's too long for my tastes; I can't have the user siting there without
> feedback for that long.
>
> Looking at resource averages as our guide on this, the Dreamhost support
> wiki says: "Average shared hosting customers normally use less than 5 CPU
> minutes per day for their account".  When you consider the popularity of
> Wordpress, Drupal, Joomla, and other PHP/MySQL-driven systems, that average
> lends a good perspective of how even complex systems perform under normal
> loads.
>
> Given the speed of the Rev engine, I'd be surprised if you ever needed more
> than a second or two to run most things you'd want to do with it on your
> server.  With the revJournal.com blog, the custom search engine I built for
> a client, and other relatively processor-intensive tasks, the Rev engine is
> able to do what I ask of it in a fraction of a second.
>
> But if you ever find that you do need to run unusually lengthy processes,
> Andre's latest article in the RevUp newsletter covers how to break up a long
> task into chunks that allow even a shared-hosting account to run long
> processes without denying performance to other accounts, and will keep your
> users happy with good responsiveness:
>
> <
> http://www.runrev.com/newsletter/august/issue98/newsletter2.php?id=NW098S29789
> >
>
>
> > 2. If I want to use RevServer on multiple domains -  is a  single license
> > good for this? Per server, not per domain, right?
>
> My understanding is that it's per server rather than per domain. So if your
> Dreamhost account has a dozen domains you should be able to use RevServer on
> all of them, but if you also have hosting on another service you would need
> an additional license for that other server.
>
> --
>  Richard Gaskin
>  Fourth World
>  Rev training and consulting: http://www.fourthworld.com
>  Webzine for Rev developers: http://www.revjournal.com
>  revJournal blog: http://revjournal.com/blog.irv
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