Re: new command-line option -nextgc-factor

With "Fix GC bug that affects some stream types (regression from 2004-04-28)"
the first time my linux smokers pass:

https://travis-ci.org/rurban/clisp/builds

windows still has the TRUENAME: Filename for #<OUTPUT UNBUFFERED FILE-STREAM CHARACTER> is unknown
problem:

https://ci.appveyor.com/project/rurban/clisp/history

Reini Urban
[email protected]



> On May 28, 2017, at 2:19 PM, Bruno Haible <[email protected]> wrote:
> 
> Hi all,
> 
> For debugging GC problems, I have added a new option -nextgc-factor.
> It is a factor that gets applied to the amount of space that can be
> consumed before the next GC is triggered.
> 
> Setting it to large values can inhibit GC for a long time:
> 
> $ ./lisp.run -q -M lispinit.mem -nextgc-factor 1e9
> [1]> (time (setq a (make-array 1000000) b nil))
> Real time: 0.038371 sec.
> Run time: 0.04 sec.
> Space: 8000016 Bytes
> NIL
> [2]> (room)
> 
> Number of garbage collections:                0
> Bytes freed by GC:                            0
> Time spent in GC:                           0.0 sec
> Bytes permanently allocated:            158,480
> Bytes currently in use:              11,107,792
> Bytes available until next GC: 1,536,935,991,966,080
> 11107792 ;
> 1536935991966080 ;
> 158480 ;
> 0 ;
> 0 ;
> 0
> 
> Setting it to small values can make GCs much more frequent:
> 
> $ ./lisp.run -q -M lispinit.mem -nextgc-factor 0.001
> [1]> (room)
> 
> Number of garbage collections:               16
> Bytes freed by GC:                       44,648
> Time spent in GC:                         1.112 sec
> Bytes permanently allocated:            158,480
> Bytes currently in use:               3,056,200
> Bytes available until next GC:               71
> 3056200 ;
> 71 ;
> 158480 ;
> 16 ;
> 44648 ;
> 1112000
> [2]> (time (setq a (make-list 1000) b nil))
> Real time: 0.687479 sec.
> Run time: 0.688 sec.
> Space: 16000 Bytes
> GC: 10, GC time: 0.688 sec.
> NIL
> 
> 
> I don't want to document this option, because the default GC frequency
> is completely sufficient for the average user.
> 
> Bruno
> 
> 
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