How come POSIX write is so fast?
How come POSIX write is so fast?
Austin Martin
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Joshua Murphy
...
James Johnson
what's enough to write fast yes command:
- calculate lcm of phrase length and 4096 (page size)
- allocate buffer with that size and fill it
- raw write that buffer in loop
simple, right? it doesn't need to be ugly gargantuan mess like GNU yes
Nicholas Clark
I'm trying to figure that one out right now
Cooper Hill
Radagast @ lothlorien ?
Lol jesus
Ryder James
Is that any faster than GNU yes?
Tyler Hill
funnily it does, I expected to be ~5% slower but it actually outperforms GNU can
Dominic Morales
>no source
Josiah Anderson
>nim
Adam Martin
Aiden Baker
#include
#include
std::string repeat(const std::string &word, int times) {
std::string result;
result.reserve(times * word.length());
for (int a = 0; a < times; a++)
result += word;
return result;
}
int main() {
std::string s = repeat("y\n", 4096 * 8);
for (;;)
std::cout
Daniel Ramirez
>implying you could write something better
get out
Chase Robinson
#define ever ;;
for(ever)
std::cout
Nicholas Kelly
don't take my spider face loop away faggot
Andrew Campbell
OP did
busybox did
#include "libbb.h"
int yes_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int yes_main(int argc UNUSED_PARAM, char **argv)
{
char **pp;
argv[0] = (char*)"y";
if (argv[1])
++argv;
do {
pp = argv;
while (1) {
fputs(*pp, stdout);
if (!*++pp)
break;
putchar(' ');
}
} while (putchar('\n') != EOF);
bb_perror_nomsg_and_die();
}
Andrew Perez
plan 9 did
while() { echo y }
Michael Peterson
and Plan 9 outputs few MB/s, not GB/s
Jeremiah Perez
why exactly does this need to be fast?
I feel like I'm missing something here
Charles Torres
and you really need a few b/s
Nathaniel Ortiz
write from C is even faster
const char *s = repeat("y\n", 4096 * 8).c_str();
for (;;)
write(1, s, 4096*8);
Jack Gray
yeah, remember when this tool was for automating the dialogs?
Parker Richardson
There's no reason why it shouldn't be simple and fast.
Lincoln Evans
behold the 9brainlet, whose puny subhuman mind is oppressed by the "complexity" of real programs so much he prefers to use the feeble powerless "simple n suckless" soyware that his retarded excuse of a """brain""" can understand...
Connor Johnson
Jason Cooper
Julian Morales
it's unbuffered, writes directly to fd as fast as fd can accept data. Also works in Windows (old XENIX call, _write)
Camden Howard
virgin BSDDies vs chad POSIXLY_CORRECT