* Re: [9fans] 8c -v- gcc
@ 2002-02-28 5:42 David Gordon Hogan
0 siblings, 0 replies; 2+ messages in thread
From: David Gordon Hogan @ 2002-02-28 5:42 UTC (permalink / raw)
To: 9fans
> free(malloc(8)) 1.1386 1.1170 0.1159
I just thought that this line needed to be highlighted.
We may not have the world's best code generation,
but our memory allocator's an order of magnitude
faster!
C:/cygwin/usr/src/cygwin-1.3.2-1/newlib/libc/stdlib/mallocr.c:
* Why use this malloc?
This is not the fastest, most space-conserving, most portable, or
most tunable malloc ever written. However it is among the fastest
while also being among the most space-conserving, portable and tunable.
^ permalink raw reply [flat|nested] 2+ messages in thread
* [9fans] 8c -v- gcc
@ 2002-02-27 12:28 steve.simon
0 siblings, 0 replies; 2+ messages in thread
From: steve.simon @ 2002-02-27 12:28 UTC (permalink / raw)
To: 9fans
Hi,
My contribution to the debate.
My machine is a 400Mhz PII laptop with 128Mbyte RAM,
it dual boots NT4 and Plan9.
gcc runs under WinNT using the Cygwin emulation
enviroment (sorry that is what I have) and is version 2.95.3-5.
Plan9 runs as a standalone machine under kfs, using ape.
I compiled cputimes.c off netlib and had to up the number of rounds to get
reliable results. Ironically I had to then reduce the number of rounds in
the push()/pop() tests as this test caused plan9 to thrash its disk -
swapping I assume.
The results look OK, nothing startling to my eyes, gcc is a
bit faster but not shockingly so. The only surprise is the
difference in strcpy() but perhaps this one is in C rather
than asm in Plan9.
Numbers with a query after them had too wide a varience in the tests
and so are "dubious". For more info look at the cputimes source.
-Steve
Operation gcc gcc-O3 Plan9
{} 0.0130 0.0050 0.0061?
i1++ 0.0018 0.0058? 0.0049?
i1 = i2 + i3 0.0020 0.0024 0.0056
i1 = i2 - i3 0.0022 0.0026 0.0066
i1 = i2 * i3 0.0040 0.0034 0.0042
i1 = i2 / i3 0.0851 0.0877 0.0842
i1 = i2 % i3 0.0835 0.0913 0.0844
f1 = f2 0.0042 0.0012? 0.0027?
f1 = f2 + f3 0.0024 0.0024 0.0049
f1 = f2 - f3 0.0032 0.0026 0.0049
f1 = f2 * f3 0.0034 0.0026 0.0049
f1 = f2 / f3 0.0845 0.0875 0.0715
i1 = f1 0.1154 0.1230 0.0895
f1 = i1 0.0072 0.0080 0.0061
v[i] = i 0.0283 0.0361 0.0351
v[v[i]] = i 0.0547 0.0555 0.0398
v[v[v[i]]] = i 0.0605 0.0561 0.0544
if (i == 5) i1++ 0.0038 0.0056 0.0059
if (i != 5) i1++ 0.0040 0.0080 0.0061
while (i < 0) i1++ 0.0036 0.0074? 0.0061?
i1 = sum1(i2) 0.0248 0.0010? 0.0183
i1 = sum2(i2, i3) 0.0309 0.0026 0.0266
i1 = sum3(i2, i3, i4) 0.0369 0.0046 0.0317
fputs(s, fp) 0.6498 0.6418 0.3717
fgets(s, 9, fp) 0.5018 0.5020 0.3355
fprintf(fp, sdn, i) 3.4040 3.3196 2.4135
fscanf(fp, sd, &i1) 1.1928 1.1588 0.8743
free(malloc(8)) 1.1386 1.1170 0.1159
push(i) 0.8100 0.7950 0.7739
i1 = pop() 0.6880 0.6370 0.3599
strcpy(s, s0123456789) 0.1050 0.1048 0.3198
i1 = strcmp(s, s) 0.0855 0.0845 0.2147
i1 = strcmp(s, sa123456789) 0.0621 0.0581 0.0373
i1 = atoi(s12345) 0.4090 0.3970 0.4099
sscanf(s12345, sd, &i1) 1.1670 1.1570 0.9679
sprintf(s, sd, i) 2.3710 2.3770 2.0919
f1 = atof(s123_45) 0.6490 0.6170 0.4579
sscanf(s123_45, sf, &f1) 1.5890 1.6170 1.4819
sprintf(s, sf62, 123.45) 6.2350 5.5430 6.0919
i1 = rand() 0.0832 0.0812 0.0475
f1 = log(f2) 0.6640 0.6338 0.6037
f1 = exp(f2) 0.9022 0.7722 0.7719
f1 = sin(f2) 0.9444 0.8762 0.6451
f1 = sqrt(f2) 2.9052 0.1652 0.9841
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