Re: Isolated: Sym gets 2 identities in a delivered app.

On 29 Aug 2010, at 23:49, Matt Lamari wrote:

> I'd like to understand if this is, by definition of how FASLs are
> created and combined, expected behavior, or if something else is afoot.

I think it's fairly clear that if you dump an uninterned symbol into a FASL file (or really anywhere that is
outside the memory of the running Lisp) then when you load it back in you will get a new symbol, and further
you'll get a new symbol each time you load it, even if you load the same FASL multiple times.

That's pretty much a defining property of uninterned symbols in fact: the only way you can get at them is if
you already have a handle onto them.

Try something like the below: save it to a file, compile it, and then load it repeatedly and call (maybe-add)
and (display-symbols) each time.  You will see it stashing distinct gensyms with the same name in the table
as it is loaded each time.

--tim

--cut--
;;;;
;;;

(in-package :cl-user)

(defvar *symbols* (make-hash-table))

(defun display-symbols ()
  (maphash #'(lambda (k v)
               (format t "~&~S -> ~S~%" k v))

Re: gc tuning

>>>>> On Thu, 26 Aug 2010 06:00:51 -0700 (PDT), Art Obrezan said:
> 
> Hello -
> 
> In short: do I need to worry about tunning GC (garbage collector) for server
> applications?
> 
> I have a web application server that seats behind a web server and is
> connected with it via the scgi protocol. The application server serves, that
> obvious, dynamic content. There are logic part, mysql interaction, templates
> output; everything, including the mysql driver, is written in CL. The
> application server is multi-threaded and for each incoming request there is
> a thread (and there is a cap of requests that the app can processes in order
> not to stress things out).
> 
> I use LW Prof 6, 32 bits, Linux. There is a dedicated 32bit small web server
> with 1.7Gb of memory (actually, I use Amazon Cloud services) that runs
> primary lighttpd + this lisp application server.
> 
> Are there tricks, advises on how to tune LW GC for server apps? Or GC is
> smart enough to adapt to every situation so I need not to worry (even
> hypothetically) about it? Does anyone have any experience with GC tuning?

Here is some draft documentation for control of the storage management system,
which we will add to the manual:

General
-------
The storage management is designed with the intention that the programmer will

Re: gc tuning

Many thanks for this draft!

As I got it:

1. I constantly monitor my app with (ROOM).
2. I do (GC-GENERATION T) if the generation 2 grows with time.

And I got that users of 32 bits LW are underpowered in comparison with 64 bits users of LW. 

Best,
 Art

> Here is some draft documentation for control of the storage
> management system,
> which we will add to the manual:

CLIM and line-style-thickness

Re: Same (uninterned) symbol, two different identities in delivered app?

Re: CLIM and line-style-thickness

Re: CLIM and line-style-thickness

Re: CLIM and line-style-thickness

toggle breakpoint errors

Re: toggle breakpoint errors

> Hi.
> 
> When I try to set a breakpoint
> I get errors like
>     No definition found - or
>     No code at that point
> and I cannot set the breakpoint.
> What are those errors and how to get rid of them ?

These "errors" might be due to the optimizer, which is pretty good at rearranging things.  This is a Good
Thing, except, when you want to debug.

Look at the output from the compiler and see what level of optimization you're getting.  Below is the output
from the compiler when I compile for debug rather than production:

;;; Safety = 3, Speed = 0, Space = 0, Float = 1, Interruptible = 1
;;; Compilation speed = 1, Debug = 3, Fixnum safety = 3
;;; Source level debugging is on
;;; Source file recording is  on
;;; Cross referencing is on

(3 means most important)

I use a defsys.sys file and set up the optimization there with something like:

(defsystem rbp (:optimize ((speed 0) (space 0) (safety 3) (debug 3) (float 1)))
...

You can set these options manually at the command line - look in the user guide / hyperspec (declaim,
proclaim, I don't remember) or ask here again, letting us know how you are doing the compilation.

pt