HFloat

acer — Fri, 26 Nov 2010 21:12:14 Z

The HFloat underperforms compared, say, to immediate integers.

restart:
kernelopts(gcfreq=[10^7,0.0000001]):
st:=time():
for i from 1 to 5 do
  for j from 1 to 10^6 do
    HFloat(j);
  end do;
  gc();
  print([kernelopts(bytesalloc),kernelopts(bytesused),kernelopts(gctimes)]);
end do:
time()-st;
                  [104903924, 4037634432, 341]
                  [104903924, 4076101300, 342]
                  [104903924, 4113039968, 343]
                  [104903924, 4150709568, 344]
                  [104903924, 4188603216, 345]
                             7.515

restart:
kernelopts(gcfreq=[10^7,0.0000001]):
st:=time():
for i from 1 to 5 do
  for j from 1 to 10^6 do
    j;
  end do;
  gc();
  print([kernelopts(bytesalloc),kernelopts(bytesused),kernelopts(gctimes)]);
end do:
time()-st;
                   [851812, 4192460624, 347]
                   [851812, 4192462656, 348]
                   [851812, 4192464632, 349]
                   [851812, 4192466544, 350]
                   [851812, 4192468488, 351]
                             0.719

restart:
kernelopts(gcfreq=[10^7,0.0000001]):
st:=time():
for i from 1 to 5 do
  for j from kernelopts(maximmediate) to kernelopts(maximmediate)+10^6 do
    j;
  end do;
  gc();
  print([kernelopts(bytesalloc),kernelopts(bytesused),kernelopts(gctimes)]);
end do:
time()-st;
                  [61723608, 4257649624, 353]
                  [61723608, 4285651840, 354]
                  [61723608, 4313653832, 355]
                  [61723608, 4341655848, 356]
                  [61723608, 4369657836, 357]
                             3.422

acer

integer ---> float

Axel Vogt — Thu, 02 Dec 2010 17:57:37 Z

I have not tested in detail, but that may the reason is, that a conversion from integer ---> float is expensive (even if you cared in your code, that it is smaller than MAX_INT)

MaplePrimes - answers and comments on Question, hfloat polynomials

HFloat

integer ---> float