On 10/18/2011 11:19 AM, Shaun McGinnity wrote:
Hi,
We have run some performance tests using the null-plugin transform example.
The test is a simple forward-proxy configuration fetching content from servers
on our internal network.
With no plugins loaded traffic server runs at ~40% CPU. When we enable the
plugin the CPU usage jumps to ~50% for the same transaction rate.
Is this increase in CPU to be expected? It seems rather large for a transform
that is just reading and writing data.
Any advice is appreciated.
I suspect this is as expected, but I'd have to do some tests myself (but
feel free to do some valgrind/callgrind tests to get some ideas). There
is going to be overhead doing a transform, because it enabled additional
code in the processing of the response bodies, regardless if it's a
"no-op" or not.
-- leif
