Re: [Pdl-porters] Benchmarks to appear in FSM

 Hello,

 I am getting confused now with inplace. The detailed code and times
are shown below.
I am running three tests trying to implement inplace operations
to make the code faster. The summary is:

Test #     command                                  time
1:      $Re=$Re+1000.;                          58 sec
2:      $Re.=$Re+1000.;                       109 sec
3:      $Re->inplace;$Re+1000.;            55 sec


 I believe test 3 is doing things really inplace, but its time is almost the
same as test 1, which is the "easy" way. Does this mean
that test 1 is really done inplace? Or maybe test 3 is not done inplace?

 I thought the .= operator performed operations inplace, and I would have
thought test 2 was also doing things inplace like test 3. Obviously it is
not. In fact it is taking twice the time to run probably meaning it is
doing the calculations twice. What am I missing here?

 Many thanks again,

 Xavier


*******************************************
Test 1
-----------------------------------------
$npts=2000;
$niter=1000;
$Re=zeroes(double,$npts,$npts)->xlinvals(-1.5,0.5);

for($j=0;$j<$niter;$j++){
   $Re=$Re+1000.;
}
------------------------------------------------
time output:

real    1m0.727s
user    0m22.794s
sys     0m36.667s

******************************************************
Test 2:
---------------------------------------------------
$npts=2000;
$niter=1000;
$Re=zeroes(double,$npts,$npts)->xlinvals(-1.5,0.5);

for($j=0;$j<$niter;$j++){
   $Re.=$Re+1000.;
}
------------------------------------------------------
time output:

real    1m53.829s
user    1m11.915s
sys     0m37.040s

*******************************************************
Test 3
-------------------------------------------------------
$npts=2000;
$niter=1000;
$Re=zeroes(double,$npts,$npts)->xlinvals(-1.5,0.5);

for($j=0;$j<$niter;$j++){
   $Re->inplace;
   $Re+1000.;
}
--------------------------------------------------------
time output:

real    0m33.181s
user    0m32.446s
sys     0m0.190s