vhiz wrote:
I found the script below in the dtrace manual:
#pragma D option quiet
BEGIN
{
printf("%10s %58s %2s %7s\n", "DEVICE", "FILE", "RW", "MS");
}
io:::start
{
start[args[0]->b_edev, args[0]->b_blkno] = timestamp;
}
io:::done
/start[args[0]->b_edev, args[0]->b_blkno]/
{
this->elapsed = timestamp - start[args[0]->b_edev, args[0]->b_blkno];
printf("%10s %58s %2s %3d.%03d\n", args[1]->dev_statname,
args[2]->fi_pathname, args[0]->b_flags & B_READ ? "R" : "W",
this->elapsed / 10000000, (this->elapsed / 1000) % 1000);
start[args[0]->b_edev, args[0]->b_blkno] = 0;
}
It does not display the file name even if I am accessing a user created file. Any ideas?
What filesystem is being used?
If it is ufs, most likely the file is cached [i,e it is already loaded
in memory] and hence no disk IO occurs to retrieve the
file from the disk.
If possible 'unmount' the filesystem and mount it back and then access
the file after running the script above, you should
see the filename displayed.
Pramod
Thank you.
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