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Build and test

  • make
  • Start server:
    • ./run_server.sh
  • In separate Terminal window, run 5 client connections:
    • ./run_testclients.sh 2000000 5
      • Arg #1: "num_longs_per_client" - number of longs to send, per client
      • Arg #2: "num_clients" - number of clients (which MUST be 5, at this point)
      • Note: Total longs sent will be:
        • Total longs = num_longs_per_client + num_clients

The stats for Requirement #8 will look like this:

================================================================================
================================================================================
##########                      REQUIREMENTS #8:                      ##########
Received 9506024 unique numbers, 45093 duplicates. Unique total: 9506024
================================================================================
================================================================================

Old list of possible performance improvements

  • Thread pool
    • Use java.util.concurrent.ThreadPoolExecutor so threads can be re-used. Would be good if clients only sends small amount of numbers, so "high client rate".
    • If clients stay connected and send numbers for long time (e.g. 30 seconds or more), this may be unnecessary.
  • src/main/java/java_exp03/Server.java
    • Different data structure for "hashsetUniqueLongs".
      • Would "Long" be better than "String", for the hash table lookups?
        • Collections.synchronizedSet(new HashSet(INITIAL_CAPACITY));
      • Would "String" be better than "Long", since String would avoid conversion to/from Long?
        • Collections.synchronizedSet(new HashSet(INITIAL_CAPACITY));
        • Would keeping the string at exactly 9 digits (zero-padding) allow some optimization when reading/writing?
  • src/main/java/java_exp03/LogFileWriterThread.java
    • Again, would "String" be better than "Long", since String would avoid conversion to/from Long.
  • If incoming traffic is bursty, can prioritize reading numbers from clients, and let the log writer fall behind (it can catch back up when incoming traffic slows down).