Marc Weber wrote:
Excerpts from Adam Chlipala's message of Wed Dec 08 01:03:42 +0100 2010:
I find it hard to believe that it doesn't matter if a web application
server uses several times more memory than it needs to, but maybe we
really have come to live in a world that crazy. ;)
Yes - we do. Imagine a server running PHP. Imagine each query to take
100ms (which is the average time it takes PHP servers to server pages
which have been written minimizing dev time).
Now imagine that each customer visits about 20 pages each day. Let's
assume you have only one "rush hour per day".
This still means that you can serve:
60min * 60sec/min * 10 pages/sec / 20 (pages/customer) = 1800 customers !
And if you have 18000 customers within one hour .. then you're lucky.
Your example is only talking about processing time, while I was talking
about memory, so this explanation doesn't seem directly helpful.
Also, I _do_ want Ur/Web to be practical to use for extremely popular
web sites. Would you really want to have to switch languages just to be
able to handle extreme hit frequencies?
Benefits of JS target:
- never think about memory
Can you expand on this point? It sounds surprising.
I meant: Never think about when to free memory. If the languages takes
care about it you don't have to.
No argument there.
Note that I ddin't talk about coding the core code of an application
(Ur) I only talked about adding some missing pieces using FFI.
My position is that the total time the whole Ur/Web community spends
writing libraries to access with the FFI should be negligible compared
to the time spent writing the main applications. Sure, it can be a pain
to get C code right, but it's probably worth it, given the long-term
performance gains. Reasonable people may disagree on this.
I find it very encouraging that an informed developer besides me (i.e.,
you :]) was able to wrap a Ruby interpreter so easily. I personally
would be more inclined to build an ML or Haskell interface, but it's
great to think that folks can quickly build interfaces to their favorite
general-purpose languages. They all tend to speak C in some form or
another.
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