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POClojure Cassandra Driver Performance
 

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    <p>I'm testing the performance of Alia in Clojure on a 6 node Cassandra cluster. Even when multi-threading I can only get about 400 writes/sec. With the Firebrand Cassandra driver and manually handling threading in Java we are able to get 5000 writes/sec with 96 threads.</p> <p>Am I doing something wrong in my utilization of agents here? The CPU usage is only ~25% on the machine which this is running on which seems really low.</p> <p>Update: At the author of Alia's suggestion, utilizing prepared statements instead of raw statements realized gains of up to 2500/sec in a synchronous, single-threaded fashion. I still need to test this by multi-threading with Clojure and separately utilizing the async function built into Alia/the underlying Java driver to see which is faster.</p> <p>Update 2: I am now seeing similar results to mpenet below by additionally utilizing the async functionality built into the driver.</p> <pre><code>(ns alia-perf-test.core (:gen-class) (:require [qbits.alia :as alia] [qbits.hayt :as hayt])) (defn exec-query [session query] (alia/execute session (hayt/-&gt;raw query))) (defmacro time-query [expr] `(let [start# (. System (nanoTime)) ret# ~expr] (/ (double (- (. System (nanoTime)) start#)) 1000000.0))) (defn write-entity [total-time session entity] (let [query (hayt/-&gt;raw (hayt/insert :entities (hayt/values entity) (hayt/using :timestamp 1234))) query-time (time-query (alia/execute session query))] (+ total-time query-time))) (defn generate-entity [] {:id (str (java.util.UUID/randomUUID)) :num 0}) (defn write-something [write-agent session] (send-off write-agent write-entity session (generate-entity))) (defn -main [&amp; args] (let [cluster (alia/cluster ["server1" "server2" "server3" "server4" "server5" "server6"] :pooling-options {:core-connections-per-host [:local 16 :remote 16] :max-connections-per-host [:local 1000 :remote 1000] :max-simultaneous-requests-per-connection [:local 32 :remote 32] :min-simultaneous-requests-per-connection [:local 16 :remote 16]}) session (alia/connect cluster)] (alia/set-consistency! :any) (exec-query session (hayt/create-keyspace :aliaperftest (hayt/with {:replication {:class "NetworkTopologyStrategy" :dc1 3 :dc2 3}}))) (exec-query session (hayt/use-keyspace :aliaperftest)) (exec-query session (hayt/create-table :entities (hayt/column-definitions {:id :varchar :num :int :primary-key [:id]}))) (let [num-entities 10000 write-agent (agent 0)] (dotimes [n num-entities] (write-something write-agent session)) (await write-agent) (println "Wrote" num-entities "entities in" @write-agent "ms -" (* (/ num-entities @write-agent) 1000.0) "ops/sec")) (exec-query session (hayt/drop-table :entities)) (exec-query session (hayt/drop-keyspace :aliaperftest)) (alia/shutdown session) (alia/shutdown cluster) (shutdown-agents))) </code></pre>
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