Script expects four arguments: low high step interval. First two of them are low and high of a range in Mbs you want your output, step describes resolution of the output and interval is a resolution of a measurement (time interval from which Mbs is calculated). In an example below I wanted to see output in a range 50-150Mbs with 5Mbs step calculated for intervals of 10s and see results every 10s. As you can see most of the time I have on average 90-120Mbs generated to/from NFS servers.
Note that this is only an estimate.
bash-3.00# cat io-nfs-throughput.d
#!/usr/sbin/dtrace -qs
BEGIN
{
bsum = 0;
}
io:nfs::start
{
bsum += args[0]->b_bcount;
}
tick-$4
{
@a["Mbs"] = lquantize(bsum*8/($4*1024*1024),$1,$2,$3);
printa(@a);
bsum=0;
}
bash-3.00# ./io-nfs-throughput.d 50 150 5 10s
[...] after some time
Mbs
value ------------- Distribution ------------- count
55 | 0
60 | 1
65 | 2
70 | 2
75 |@ 3
80 |@ 8
85 |@@@ 17
90 |@@@@@ 32
95 |@@@ 16
100 |@@@@ 23
105 |@@@@ 22
110 |@@@@ 21
115 |@@@@ 21
120 |@@@ 19
125 |@@@ 17
130 |@@ 14
135 |@@ 11
140 |@ 7
145 | 0
>= 150 |@ 4
1 comment:
Good insights. You might be interested in a new tool available at www.ortera.com. Your perspective would be valuable.
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