Hello all, I'm having trouble with dropped connections under a loadtest.
The setup: Java app with Tomcat 6 under an Ubuntu 8.04 VPS (virtual linux server) proxied with a varnish 2.1.2 (16M malloc)
The test: The load test itself is aimed at generating many HTTP connections, which after a brief setup phase are served entirely by varnish. Hence the system load remains low (2% CPU consumed by varnish at 300 requests / second).
The problem: As a measure for response, I am requesting an image from the webapp running in Tomcat while the loadtest is underway. However that either times out or is delivered after several seconds. Varnishlog will often either not show the request (RxURL) at all, or show it several seconds after the browser dispatched it.
I don't believe it to be a network/OS issue, as the server will happily accept SSH connections while the loadtest is ongoing and remains responsive throughout the test.
How do I debug this? Thanks in advance, G.
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