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will soon be formally announcing the next major version of the
Apama product, but I thought I would give a bit of a sneak preview
We've added a number of significant enhancements to the
in particular I want to highlight is a new parallel execution model.
Our CEP engine's new parallelism allows massive vertical
scalability on multi-core hardware. We can leverage 8-way, 16-way even
32-way processors with ease. We've enabled this capability
by extending the Apama EPL with four new keywords. To explain requires
a bit of background ...
the Apama EPL, we have the notion of a
“sub-monitor”, which can be thought of as a
separate parameterized “instance” of a set of
business logic that encompasses a scenario, a
trading strategy for example.
Each sub-monitor can load and
maintain its own data (e.g. consider a sub-monitor as corresponding to
different occurrence, with different timeouts, key indicators, client
and can set up its own listeners to key into a (different or
subset of the event stream. This allows us to easily model factory
behavior, with each sub-monitor maintaining it's own state and
listening for different (sequences of) events – but applying
the same basic logic including the actions to take
condition becomes true. We call this our micro threading
the latest Apama release,
v4.1 we extended this and introduced
the notion of contexts.
These are silos of execution which take the factory
the next level. ”context" is a reserved word in Apama 4.1
– it defines a
collection of sub-monitors which can inter-operate in a protected
space, with strong semantics for inter-context communication (via event
passing) similar in concept to the Erlang
message passing programming model. Most importantly, it is also the
unit of parallelization – allowing
the same CEP engine to
spawn multiple “contexts” which key into the event
flow but execute in parallel on multi-core
in Apama's EPL adhere to our language's basic event paradigm, providing
a safe semantic for concurrency yet avoiding the typical race conditions
common in multi-threaded programming in other languages (i.e. java)
which require the use of mutexes, semaphores, etc.
"The world IS
concurrent. It IS parallel. Things happen
all over the place at the same time. I could not drive my car on the
highway if I did not intuitively understand the notion of concurrency;
pure message-passing concurrency is what we do all the time."
A great quote, one that we've taken
to heart in
the design of the parallelism now available in our EPL. Our
approach is based on a deep understanding of the types of
applications being built with the Apama platform. Our broad customer
base provided us that advantage. For example, we took our Smart
Order Router Solution Accelerator, enhanced it to use the context model and did a
performance benchmark and achieved a 6.5 times increase in overall
capacity on an 8-core server while holding to a steady low-latency
threshold (notice we also improved overall performance in the
v4.1version over previous versions as well).
graph that compares the Capacity (number of concurrent open orders that
processed in a specific timescale) of the Equities Smart Order Router
increasing number of symbols. The comparison was on three
the Apama product. In the parallel version we have modified
to partition symbols across contexts (each context goes on a processor
used for the experiment was an 8-core Intel Server.
parallel execution model is a reflection of how our customers use CEP
technology to build out real world applications. The competitive
landscape of CEP dwells on performance with wild claims of speed often
without substance. It reminds me of a teenager revving their car's
engine at a traffic light. You can see the needle on the tachometer
race up, the engine makes a lot of noise, but to what purpose? With the
new release of the Apama CEP platform it shows that we know how and when to engage
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