Using mpm_worker gave less impressive results; I'd say about 1/2, a
much worse load average (way more than 5), and lots of swap. Seems
like prefork works better on linux and I'm surprised. Anyway,
assuming that I got the maxProcessors wrong I should have seen queues
building up @ 150*4 instead they start < 50% that value.
The thing that makes me think it's a mod_jk issue is the fact that
suddenly all request flow locks onto a node and stays busy until I
restart apache.
e
On 01/set/06, at 21:21GMT+02:00, Filip Hanik - Dev Lists wrote:
since you are using prefork, you must set cachesize=1 for your
workers.properties file.
However, you have 4096 MaxClients, in order to serve this up in
tomcat, your JK connector should have maxProcessors="4096".
An alternative, and safe solution, although much less performance,
is to set "MaxRequestsPerChild 1", this way you can get away with
MaxClients 4096 and still have a much less maxProcessor value on
Tomcat
Filip
Edoardo Causarano wrote:
Hello List,
scenario:
- 4 node tc 5.0.28 vertical cluster ( :-| same server... still
testing, but it could have been 8) listening on ajp
<Connector address="x.x.x.x" port="8009"
maxProcessors="150" minProcessors="50"
protocol="AJP/1.3"
protocolHandlerClassName="org.apache.jk.server.JkCoyoteHandler"
redirectPort="8443">
- 1 httpd 2.0.52 with mod_ajp 1.2.15 and prefork config on RH AS4,
kernel 2.6.9-5.EL
sticky sessions are disabled to avoid stress scripts hitting
only one node
<IfModule prefork.c>
StartServers 40
MinSpareServers 80
MaxSpareServers 280
ServerLimit 4096
MaxClients 4096
MaxRequestsPerChild 4096
</IfModule>
- 1 application where a couple of thousand users should hammer the
app deployed on the webapp
What happens is the app takes the stresser for a ride until 240
circa users then starts to die; jkmonitor sees linear increase on
busy and max requests on only one node and pages hang; disabling
the node moves the hung request handling to the next node.
Where's the bottleneck? Any known bug in mod_jk? Should I increase
threads on the tomcat nodes?
Tnx,
e
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