i am doing reads and writes to /dev/rdsk/c0t2d0s4
using dtrace to see how much time it took for ssdread and ssdwrite. It shows
very small number 4 or 5.
#pragma D option flowindent
syscall::pread:entry
{
self->trace = 1;
self->size = arg2;
}
syscall::pwrite:entry
{
self->trace = 1;
self->size = arg2;
}
fbt:ssd:ssdread:entry
/self->trace/
{
self->start = timestamp;
self->minor = getminor(arg0);
}
fbt:ssd:ssdread:return
/self->start/
{
@avrg[pid,probefunc,self->minor,self->size] = avg((timestamp - self->start) /
1000);
@numbers[pid,probefunc,self->minor,self->size] = count();
self->start = 0;
}
fbt:ssd:ssdwrite:entry
/self->trace/
{
self->start = timestamp;
self->minor = getminor(arg0);
}
fbt:ssd:ssdwrite:return
/self->start/
{
@avrg[pid,probefunc,self->minor,self->size] = avg((timestamp - self->start) /
1000);
@numbers[pid,probefunc,self->minor,self->size] = count();
self->start = 0;
}
dtrace:::END
{
printa(@avrg);
printa(@numbers);
}
But the reads and writes take a long time actually. Why isnt that reflected in
the ssdread and ssdwrite times that dtrace shows. Problem with dtrace or this
provider does not work? I think my dtrace script is correct.
Please anybody?
Thanks
amujoo
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