Re: Got "Too many open files" and "failed to establish a connection" error message

On Wed, 2004/11/03 (MST), <[email protected]> wrote:

> I am not sure if polygraph server is short in resources or proxy server.
> Here are the messages I got.
> 000.41| Client.cc:306: error: 32/64 (c59) failed to establish a  
> connection
> 000.41| 10.10.10.10 failed to connect to 10.10.10.1:10000
> 000.42| Connection.cc:120: error: 64/127 (s24) Too many open files
>
> Can not see any error message in system log file.

It looks like polyclt ran out of filedescriptors during the first minute  
of the test. This may imply that you have a very low number of  
filedescritors or a very aggressive initial request rate. Are you using a  
simple.pg or similar best-effort workload? If yes, you probably need to  
tune your OS for more filedescriptors and rebuild Polygraph. When executed  
with --verb_lvl 10, polyclt will report then number of available  
descriptors (look for "FD" in the beginning of the console log).

If you are using a constant-request rate test, consider ramping up the  
request rate slowly; give the testbench and the proxy at least a couple of  
minutes to adjust to increasing load.
PolyMix and WebAxe workloads have examples on how to do that in PGL.

To rule out a proxy as a bottleneck, consider running a no-proxy  
back-to-back test. In most cases, you should make sure that a no-proxy  
test can sustain higher loads than a proxy test. Otherwise, you may be  
measuring testbench bottleneck, not the cache.

HTH,

Alex.