Hello,
Could you please help me with the following code with O_DIRECT and array. I
tried to implement direct io and stuck with weird behaviour of alignment
writes created from array.
Following code doesn't work:
package main
import (
"os"
"syscall"
)
func main() {
var p [2 << 16]byte
for i := 0; i < len(p); i++ {
p[i] = byte(' ' + i%('~'-' '))
}
f, _ := os.OpenFile("/tmp/1.txt",
os.O_TRUNC|os.O_CREATE|os.O_WRONLY|syscall.O_DIRECT, 0666)
defer f.Close()
f.Write(p[:])
}
But, if I make a copy of that array – it's OK:
package main
import (
"os"
"syscall"
)
func main() {
var p [2 << 16]byte
for i := 0; i < len(p); i++ {
p[i] = byte(' ' + i%('~'-' '))
}
f, _ := os.OpenFile("/tmp/1.txt",
os.O_TRUNC|os.O_CREATE|os.O_WRONLY|syscall.O_DIRECT, 0666)
defer f.Close()
var a []byte // <----- copy
a = append(a, p[:]...) // <----/
f.Write(a)
}
Can't figure this out. And how to catch such behaviour in runtime.
Thank you!
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