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1.7 Performance via HTTP

From: Mark Phippard <markphip_at_gmail.com>
Date: Wed, 11 May 2011 19:40:08 -0400

I ran the benchmark tests again using latest trunk for server and
client. The numbers are interesting. See them here so you can see
table formatting:


Using Neon, performance is improved across the board. In some cases,
substantially. The number of HTTP requests were cut from 11,723 down
to 5,415!

The story using Serf is not as good. There are a few places where it
is fastest, namely merge. But there are other cases where it is
dramatically slower. The number of HTTP requests with Serf is 80,990.
 Looking at the numbers, it seems like Serf is slowest when it comes
to the areas where it issues all those GET requests, such as checkout
and update. On other operations it is more inline with Neon. Maybe
there is more that could be done to speed up those areas or maybe you
need to get the server under high load for the benefits of the Serf
approach to manifest? FWIW, I monitored the CPU usage of the server
during the run. The utilization was low throughout the runs but
definitely higher when Serf was used. That said, I could also see it
using both CPU cores when Serf was used, but not with Neon.

When you are in Berlin next week I hope you can revisit the discussion
about whether Serf should be our default. Right now, unless there are
more improvements, I am going to advise that we patch our CollabNet
binaries so that Neon is the default. We will of course still include
Serf so that it can be configured but I do not think it makes sense
for it to be the default if it is going to be considerably slower at
most operations.

Mark Phippard
Received on 2011-05-12 01:40:34 CEST

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