Bob.Stout@p6.f506.n106.z1.fidonet.org (Bob Stout) (06/12/89)
About 2 years ago, this topic came up on FidoNet. Using the following
(admittedly rigged) benchmark, I tested all of the technology available to me.
main()
{
char string[30];
int a = 2, b = 3, c = 5;
int d, data[30], i, j, k;
for (i = 0; i < (a + b) * c; )
{
k = 12 / b;
data[i] = k;
i += a/2;
j = data[i] * b;
}
for (i = 0; i < 10; i++)
{
if (i < 5)
d = a * b + i;
else
c = a * b + i;
string[i * a + b] = (char)(c + d);
}
do
{
if (data[k] == c)
data[c - b - a] = b - a;
else
data[c - b - a] = a - b;
if (b > c)
data[b - a] = c - b - a;
else
string[a] = string[b];
k = (int)string[a];
} while (k);
}
Here is the list with timings for the revised benchmarks executing 100,000
iterations and the new assembly sizes (where available - see notes).
Machine/OS Asm size Time to execute (1)
---------------------- -------------- -------------------
VAX 780 VMS 89 lines (2,3) 12.?? (4)
MicroVAX Unix system V 91 lines 178.80 (5)
Sun 3 Unix 4.2 BSD 125 lines 41.9
Pyramid Unix 4.3 BSD 108 lines 91.81
Cray 2 UniCOS 347 lines 5.97
Cray X-MP 48 UniCOS - (6) - 5.29
Datalight Optimum-C 100 lines (2)
8 MHz AT DOS 3.1 24.33 sec.
NOTES: (1) timing in sec. for 100,000 iterations (except where
noted) for a single dedicated user
(2) commented w/ C source
(3) asm source in OPTBNCH.ARC is for single iteration
(4) very coarse timing - only 1 user
(5) timing is for 10K iterations (17.88 sec.) * 10
(6) Beta test vectorizing C compiler - asm not available
Again note that this is two-year old technology! Still, the main things that
have changed are that the Cray's UniCOS compiler is out of beta test and
available on the Y-MP and the Datalight DOS compiler has been superceded by
the new Zortech compiler.