[Tcl-bugs] [ tcl-Bugs-1465666 ] 8.5 lists sometimes uses more memory for 8.4..

[SourceForge.net <no...@so...>]

Bugs item #1465666, was opened at 2006-04-06 07:47
Message generated for change (Comment added) made by kennykb
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=110894&aid=1465666&group_id=10894

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: 10. Objects
Group: current: 8.5a4
Status: Open
Resolution: None
Priority: 3
Submitted By: afredd (afredd)
Assigned to: Kevin B KENNY (kennykb)
Summary: 8.5 lists sometimes uses more memory for 8.4..

Initial Comment:
Just stumbled across a case where 8.5 appears to use
more memory than 8.4 on windows.

The following loop builds a list and uses the *same*
amount of memory for both 8.4.8 and 8.5a4 on my
machine:

 set lst {}
 for {set i 0} {$i < 2000000} {incr i} {
  lappend lst $i
 }

(~56,800K for both versions.)

Now just sticking a dash in front of the $i
changes things:

 set lst {}
 for {set i 0} {$i < 2000000} {incr i} {
  lappend lst -$i
 }

Now 8.4.8 uses 96,100K to 8.5a4's 103,724K.
(In task manager there's a difference of 7K between
the Mem Usage, and a difference of 8K in the VM Size).
Both runs are done in fresh tclsh's.

Using different item elements brings back memory
usage parity eg. [lappend lst " $i "]
uses the same in both. Also ".$i" uses more in 8.5
, but "..$i" gives the same. Weird!

Is this additional memory usage due to a bug fix,
or an (un)?intended behaviour change?

Cheers.

----------------------------------------------------------------------

>Comment By: Kevin B KENNY (kennykb)
Date: 2006-06-21 09:37

Message:
Logged In: YES 
user_id=99768

I just tested this on my machine, and I get nearly identical
results between the two releases.  By contrast, I get
significantly different results between builds with and
without --enable-threads.  I expect this, since the threaded
allocator has somewhat higher overheads than the
non-threaded version.

Can you verify that the results of [parray tcl_platform] are
the same between your 8.4 and 8.5 builds?

----------------------------------------------------------------------

Comment By: Don Porter (dgp)
Date: 2006-06-20 16:40

Message:
Logged In: YES 
user_id=80530


something related to number
formating?

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=110894&aid=1465666&group_id=10894