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Re: faster Config.pm, charnames.pm, ..

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From:
Elizabeth Mattijsen
Date:
September 8, 2003 08:34
Subject:
Re: faster Config.pm, charnames.pm, ..
Message ID:
p05111b10bb8248f32515@[192.168.56.4]
At 14:47 +0100 9/8/03, Dave Mitchell wrote:
>On Mon, Sep 08, 2003 at 03:06:32PM +0200, Elizabeth Mattijsen wrote:
>>  I'm only interested (probably my tunnel vision  ;-) in saving memory,
>>  as that means saving memory multiple times over when using threads,
>  > plus making threads faster on startup.
>Note that Config.sh declares the vars holding the big strings as 'unique',
>so they don't get copied when new threads are created.

Running a simple test with Benchmark::Thread::Size confirms this.
However, it is not nearly as much as you would hope it would save  ;-(

Performing each test 10 times
(ref) 10 100
normal 10 100
unique 10 100
   #   (ref)      normal      unique
   0    2187 ± 2     +20         +20
   1    2610 ±16     +37 ± 4     +30 ±14
   2    2944 ±18     +62 ±18     +41 ±18
   5    3912 ±18    +122 ±22     +71 ±20
  10    5534 ±18    +221 ±26    +125 ±28
  20    8774 ±30    +424 ±34    +236 ±30
  50   18493 ±32   +1045 ±50    +540 ±66
100   34689 ±32   +2069 ±70   +1063 ±74

==== normal ======================================================
our $var = 'abcdefghij' x 1000;

==== unique ======================================================
our $var : unique = 'abcdefghij' x 1000;

==================================================================


Liz

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