不要追求绝对的公平,红尘之中没有公平而言,人活一世,难得糊涂。
it is no use doing what you like, you have got to like what you do.
ERROR 263377
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下一篇 2007-06-04 18:11:28
/ 个人分类:Mercury LoadRunner
f it is working in the LoadRunner scrīpt up to a point, then the problemprobably(see footnote 1 at end of post) exists in the system under test. Are
you or anyone else monitoring the system under test? The first places
to look would be at the web and app-servers:51Testing软件测试网3V\Z^vcV
1) heap sizes
d y?lvU02) number of jvms
S6X+fUs6L$\03) number of jdbc connections
0]
W|fzTD04) heap pattern
'Xq,lS1C05) container threads51Testing软件测试网 d!X [n+dtU
6) web component connections should be equal to or less than the http server connections51Testing软件测试网0k^){gwXbX_xT
... much more if these are not involved in the root cause ...
*VO.~%bX,W3I051Testing软件测试网fk&Bi+LB1O?
Are these configured properly?51Testing软件测试网%c9bZ#~#G&f;UX`3V
JC
Is there evidence of maxing out the heap and going beyond?
)WPQTw-|%p0Is garbage collection running too frequently and for long periods of time?
Cu'G;|)WO1a0... and so on...51Testing软件测试网sTa
zWC*EK}!L
k(l#WHd*_D+t051Testing软件测试网/as1^.S1cXI;x
Footnote 1:
%Wd$nrdn0There
is still a chance that you may be contributing to the issue on your end
(not to say the sys-under-test is not the issue - and that it may
require tuning or scalabiity work in 2 dimensions), depending upon the
answers to the below questions AND the computing power/configuration of
the servers-under-test...
:]K g1@V6Lh\!_01. How fast are these Vusers executing? (with or without think time)?
4CD,a
^@W3Q02. Are the Vusers simulating a new user each iteration?
|GV2O*@w4d051Testing软件测试网Gh;{lt*P1W#h
Finally...51Testing软件测试网F2G&o*`0|.?Q
B
Increasing
the web_set_max_html_param_len to 819200 is just not good - unless one
has to deal with .NET and large cumbersome viewstates. Think about that
value. Understand the impact of the RAM consumption by the Vusers. This
is called "shooting oneself in the foot".51Testing软件测试网m{9IvS
It appears that it is a bottleneck in the environment.
~!t,vV.[2T0I suggest the following:51Testing软件测试网#m;|1\hNV
Determine
how often and how long garbage collection is running. Monitoring by
either LoadRunner, SiteScope, or tools used by the SysAdmins should be
able to tell you that.
}d!H"AaK^#?0If load-balancing is being used, what is the
method? Are the Vusers being load-balanced properly? Do you need to use
IP Spoofing?
i!RD_-f0I recommend changing:51Testing软件测试网
H.TQG
V([5y`
a) both JVMs to 256/768, (what
is the reason they are different to begin with? Perhaps there is good
reason - if not, change to recommended.)
J7e]o%q}$y4]$y0b) JDBC Max to 75, and51Testing软件测试网L%V1yZ,R O/}
c) Consider using another JVM.
F'LP)cpeJL*J051Testing软件测试网&xS;Q{9t4F)LC"GY
Are the Vusers getting HTTP-500s?51Testing软件测试网Z;MH+z0Y#jm
Are you getting any premature connection shutdowns/closures?51Testing软件测试网XDo0N*\%rPL.S
x)?&n,a+yz{0Note!
At this point, the troubleshooting should involve some key technical
people on your end. And, by far the largest point here…51Testing软件测试网[:TL~6o
What must
the architecture support in terms of transactions and types per second?
Are you perhaps putting a load on that goes well beyond what is
required?51Testing软件测试网Pl
x
Z}&kEV
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