nfsv3fileio.d Reports Read and Writes

This DTrace script prints a summary of file read and write bytes:

#!/usr/sbin/dtrace -s

#pragma D option quiet

dtrace:::BEGIN
{
        trace("Tracing... Hit Ctrl-C to end.\n");
}

nfsv3:::op-read-done
{
        @readbytes[args[1]->noi_curpath] = sum(args[2]->res_u.ok.data.data_len);
}


nfsv3:::op-write-done
{
        @writebytes[args[1]->noi_curpath] = sum(args[2]->res_u.ok.count);
}

dtrace:::END
{
        printf("\n%12s %12s  %s\n", "Rbytes", "Wbytes", "Pathname");
        printa("%@12d %@12d  %s\n", @readbytes, @writebytes);
}

This output shows a few files were read, and one was written:

# ./nfsv3fileio.d
Tracing... Hit Ctrl-C to end.
^C

      Rbytes       Wbytes  Pathname
           0       206663  /export/stuff/words10
        8624            0  /export/stuff/bin/echo-client-2
       13228            0  /export/stuff/bin/echo
      496292            0  /export/stuff/bin/ecpg

The following table describes the fields that are printed by the nfsv3fileio.d script.

Field	Description
Rbytes	Bytes read for this path name
Wbytes	Bytes written to this path name
Pathname	Path name of NFS file