Parallelize script verification

* During block verification (when parallelism is requested), script
  check actions are stored instead of being executed immediately.
* After every processed transactions, its signature actions are
  pushed to a CScriptCheckQueue, which maintains a queue and some
  synchronization mechanism.
* Two or more threads (if enabled) start processing elements from
  this queue,
* When the block connection code is finished processing transactions,
  it joins the worker pool until the queue is empty.

As cs_main is held the entire time, and all verification must be
finished before the block continues processing, this does not reach
the best possible performance. It is a less drastic change than
some more advanced mechanisms (like doing verification out-of-band
entirely, and rolling back blocks when a failure is detected).

The -par=N flag controls the number of threads (1-16). 0 means auto,
and is the default.

This commit is contained in:

Pieter Wuille

2012-12-01 23:04:14 +01:00

parent 1d70f4bde8

commit f9cae832e6

7 changed files with 281 additions and 6 deletions

									
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bitcoin-qt.pro
									
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				@@ -156,6 +156,7 @@ HEADERS += src/qt/bitcoingui.h \

				    src/init.h \

				    src/irc.h \

				    src/mruset.h \

				    src/checkqueue.h \

				    src/json/json_spirit_writer_template.h \

				    src/json/json_spirit_writer.h \

				    src/json/json_spirit_value.h \

Parallelize script verification

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