Hello all. I've had occasion to start using Perlbal to front some Rails
applications of late. Since it has fabulous statistics, we wanted to be able
to see what's up with our Perlbal instances in a vmstat-like way. Attached i
s
the (admittedly quick) first pass at a script that does just that, at the
moment for Client Socket states and URI listings. Language snobs beware, it'
s
written in Ruby, as that's what the client is most familiar with. 

For example:

./pbstat perlbal1 perlbal2
hostname        tc      r_h     w_b     b_s     w_r     x_r     d_r     w_s 
    w_o     x_d
perlbal1        0       0       0       0       0       0       0       0   
    0       0
perlbal2        18      0       0       0       17      1       0       0   
    0       0
perlbal1        0       0       0       0       0       0       0       0   
    0       0
perlbal2        18      0       0       0       16      2       0       0   
    0       0
perlbal1        0       0       0       0       0       0       0       0   
    0       0
perlbal2        20      0       0       0       19      1       0       0   
    0       0
perlbal1        0       0       0       0       0       0       0       0   
    0       0
perlbal2        19      0       0       0       17      2       0       0   
    0       0

The columns are:

total connections: tc
reading_headers: r_h
wait_backend: w_b
backend_req_sent: b_s
wait_res: w_r
xfer_res: x_r
draining_res: d_r
wait_stat: w_s
wait_open: w_o
xfer_disk: x_d

A more entertaining mode (but perhaps less useful) will show all the URIs th
at
the client proxy is serving:

./pbstat -d 0.1 -u perlbal1 perlbal2
perlbal1       http://127.0.0.1:4999/  1
perlbal2       http://127.0.0.1:4999/search    1

(The number on the end is a count.)

Finally, you can just issue raw commands to the Perlbal backends:

./pbstat -c 1 -r "proc" amos1test amos2test
perlbal1       time: 1178747525
perlbal1       pid: 21240
perlbal1       utime: 10.752672 (+9.732609)
perlbal1       stime: 2.756172 (+2.576161)
perlbal1       reqs: 3590 (+0)
perlbal2       time: 1178747525
perlbal2       pid: 25966
perlbal2       utime: 2629.856355 (+2629.856355)
perlbal2       stime: 519.304454 (+519.304454)
perlbal2       reqs: 1041492 (+0)

Like I said above, it's pretty rough, but not a bad first start. Are there
other statistics that would be useful to display? How should they be
displayed?

If people have suggestions, I'll be happy to refactor this and make it a mor
e
useful tool.

Otherwise, fun toy. 

It's attached to this message, or you can get it from:

svn://cabo.hjksolutions.com/pbstat/trunk

Adam

--
HJK Solutions - We Launch Startups - http://www.hjksolutions.com
Adam Jacob, Senior Partner
T: (206) 508-4759 E: adam@hjksolutions.com

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