[R] R-0.65.1 Startup

[Guido Masarotto]

On Sat, Nov 13, 1999 at 08:15:25AM +0000, Prof Brian D Ripley wrote:
> The puzzle becomes why rw0641 works. It did use different memory
> allocator, and it is possible that one is faster on Win 9x. (As it leaks
> badly, we do not use it any more.)
> 

Partha, 
could you provide more details (content of an eventual .RData
file, memory reported by Windows,what happens if you start R from a
new directory,...).
I am really curious about the difference between rw0641 and rw0651.
As Brian reported, we have changed the memory allocator.
But, I am not able to reproduce the differences.
E.g., look to the following (PII 233, RAM 64M , NT4SP5):

-------------------------------------------------------------------------------
[/tmp]% cat quit.R
q()
[/tmp] time /buffer/rw0641/bin/Rterm.exe --vsize 25M --nsize 1M --slave --no-save < quit.R

real    0m1.703s
user    0m0.020s
sys     0m0.010s
[/tmp] time /buffer/rw0641/bin/Rterm.exe --vsize 25M --nsize 5M --slave --no-save < quit.R

real    0m31.926s
user    0m0.010s
sys     0m0.050s
[/tmp] time /tmp/rw0651/bin/Rterm.exe --vsize 25M --nsize 1M --slave --no-save < quit.R

real    0m1.773s
user    0m0.020s
sys     0m0.010s
[/tmp] time /tmp/rw0651/bin/Rterm.exe --vsize 25M --nsize 5M --slave --no-save < quit.R

real    0m30.224s
user    0m0.030s
sys     0m0.010s
-------------------------------------------------------------------------------

I am not too much confident about 'user' and 'sys' timing. But the 'real' one
is what I observed (elapsed time, no other process active).


BTW, on the same system, under Linux, I obtain:
------------------------------------------------------------------------------
R-0.64.1
========
[~/tmp]% time  R --vsize 25M --nsize 1M --slave --no-save  < quit.R

real    0m1.345s
user    0m1.130s
sys     0m0.210s
[~/tmp]% time  R --vsize 25M --nsize 5M --slave --no-save  < quit.R

real    0m28.527s
user    0m1.230s
sys     0m2.750s

R-0.90.0 Today snapshot:
========================
[~/tmp]% time  ~/src/R/bin/R  --vsize 25M --nsize 1M --slave --no-save  < quit.R
 
real    0m1.286s
user    0m1.060s
sys     0m0.220s
[~/tmp]% time  ~/src/R/bin/R  --vsize 25M --nsize 5M --slave --no-save  < quit.R
                                                            
real    0m31.809s
user    0m1.120s
sys     0m1.900s
-----------------------------------------------------------------------------

which shows that degradation in startup time due to an increase in 'nsize'
is more or less the same.

guido

  



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