46ef61a702
Most objects are written as OFS_DELTA with the base in the pack, that is why this case comes first in writeHeader(). Rewrite the condition to always examine this first and cache the PackWriter's formatting flag for use of OFS_DELTA headers, in modern Git networks this is true more often then it it is false. Assume the cost of write() is high, especially due to entering the MessageDigest to update the pack footer SHA-1 computation. Combine the OFS_DELTA information as part of the header buffer so that the entire burst is a single write call, rather than two relatively small ones. Most OFS_DELTA headers are <= 6 bytes, so this rewrite tranforms 2 writes of 3 bytes each into 1 write of ~6 bytes. Try to simplify the objectHeader code to reduce branches and use more local registers. This shouldn't really be necessary if the compiler is well optimized, but it isn't very hard to clarify data usage to either javac or the JIT, which may make it easier for the JIT to produce better machine code for this method. Change-Id: I2b12788ad6866076fabbf7fa11f8cce44e963f35 |
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| .settings | ||
| META-INF | ||
| findBugs | ||
| resources/org/eclipse/jgit/internal | ||
| src/org/eclipse/jgit | ||
| .classpath | ||
| .fbprefs | ||
| .gitignore | ||
| .project | ||
| about.html | ||
| build.properties | ||
| plugin.properties | ||
| pom.xml | ||