What python can learn from java

What python can learn from java

• 1.
  What Python canlearn from Java jbellis@datastax.com Saturday, September 10, 2011
• 2.
  Saturday, September 10,2011
• 3.
  (Not a webdevelopment perspective) Saturday, September 10, 2011
• 4.
  Lesson one: GC ✤ Hotspot GC ✤ Pluggable ✤ Well-documented (http://java.sun.com/j2se/reference/ whitepapers/memorymanagement_whitepaper.pdf) ✤ Tuneable (http://www.slideshare.net/ludomp/gc-tuning-in-the- hotspot-java-vm-a-fisl-10-presentation) Saturday, September 10, 2011
• 5.
  Troubleshooting OOM Saturday, September10, 2011
• 6.
  Troubleshooting fragmentation http://www.cloudera.com/blog/2011/02/avoiding-full-gcs-in-hbase-with-memstore-local-allocation-buffers-part-2/ Saturday, September 10, 2011
• 7.
  Lesson 2: Concurrency ✤ For CPU-bound applications, copies are the enemy ✤ Corollary: you need to support threads + shared state ✤ Actor model ✤ Multi-process + sysv Saturday, September 10, 2011
• 8.
  java.util.concurrent: ahead ofits time ✤ ConcurrentSkipListMap ✤ CopyOnWriteArrayList ✤ NonblockingHashMap* ✤ Atomic[Int|Long|Reference|...] ✤ SynchronousQueue ✤ Java 7: TransferQueue ✤ ThreadPoolExecutor, ScheduledThreadPoolExecutor ✤ FutureTask Saturday, September 10, 2011
• 9.
  Shared state =good, Mutable state = bad ✤ guava: Immutable collections ✤ http://code.google.com/p/guava-libraries/ ✤ Persistent collections ✤ http://code.google.com/p/pcollections/ ✤ (More accurately, “What Python can learn from Haskell”) Saturday, September 10, 2011