jgit/org.eclipse.jgit at 941b3d8a8105333ccbc15e3b57574fce6da6f006 - jgit

纯java实现的git操作库。

roberto 941b3d8a81 IndexPack: Remove blob-streaming size threshold Always use streaming (for SHA-checksum & collision detection) when indexing whole blobs, regardless of their size. Positives: * benefits of bugfix #312868 will apply to all runtimes, without additional conf for mem-constrained JVMs (5MB huge for some) * no byte array allocation (re-uses readBuffer instead of allocating new full-size array) * mildly better overall performance (given the usual blob-does-not-need-collision-checking case) * removes unnecessary code Negative: * doubles the disk IO for a blob comparision (comparitively rare occurance) I perf-tested a range of threshold sizes against a random selection of packfiles I found on my harddrive, the results are here: https://spreadsheets.google.com/ccc?key=tLCQElyyd2RKN9QevfvgwGQ&hl=en_GB#gid=1 My interpretation of the results is that the streaming size threshold isn't beneficial (actually seems to be very slightly detrimental) -so we should just get rid of it. This tallies with some of the comments Shawn & I had for the default value of streamFileThreshold in the review for I862afd4c: http://egit.eclipse.org/r/#patch,sidebyside,2040,2,org.eclipse.jgit/src/org/eclipse/jgit/transport/IndexPack.java The perf-test code is here: https://gist.github.com/735402 It's a bit scruffy but basically does 10 runs (in randomised order) for each threshold size on various packfiles, waiting a second between each pack-indexing to allow GC to catch up. I know it's not perfect - proper perf testing is hard to do :-)		14 years ago
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.settings	Run formatter on edited lines via save action	14 years ago
META-INF	Define NoteMap, a simple note tree reader	14 years ago
findBugs	Revert "[findBugs] Silence DM_STRING_CTOR on PacketLineIn"	14 years ago
resources/org/eclipse/jgit	Provide file utilities for file deletion	14 years ago
src/org/eclipse/jgit	IndexPack: Remove blob-streaming size threshold	14 years ago
.classpath	Externalize strings from JGit	15 years ago
.fbprefs	Initial JGit contribution to eclipse.org	15 years ago
.gitignore	Finish removing Apache Felix maven-bundle-plugin	15 years ago
.project	Revert "Hide Maven target directories from Eclipse"	14 years ago
about.html	Adding some Eclipse-related legal files to JGit	15 years ago
build.properties	Add "resources/" as a source folder	15 years ago
plugin.properties	Cleaning up provider and feature names	15 years ago
pom.xml	[findbugs] Respect exclude filter in maven build	14 years ago