- Boot[1] – The main advantage to multi-threading the boot is because in the Jikes rvm the Boot code compiles around methods 100 every time. The beauty in this multi-threaded optimization is the speedup achieved by this optimization is independent of the benchmark or program the user is running. Unfortunately this optimization is still in a pre version 0 phase however I hope to polish it up in the near future as continued post GSOC work. Hopefully we can get speed up from the multithreading with no overhead from the threading.
Speed up graphs will be posted in the future
Saturday, August 20, 2011
Parallel Boot
Parallel Precompile
Pre Compile[1] – Pre Compile's core method that controls compilation is embarrassingly parallel because it uses a For loop to iterate over each Method. Currently due to time constraints of Google Summer the multi-threaded PreCompile method is in an non optimized version 0 state and is currently seeing overhead but the overhead is minimal because it is causing neither a speed up nor a slow down in other words the running time is the same. However, that can be easily fixed by sending groups of data onto a thread at once preferably 1/2 methods for thread one and 1/2 methods for thread two on a two thread system which is an optimization that was used to help improve multi-threaded Single-Method[2,3,4,5,6].
Command to run and generate advice file: ./rvm -X:aos:enable_advice_generation=true -cp dacapo-2006-10-MR2.jar Harness xalan
Command to run and precompile advice file with N threads: ./rvm -X:aos:enable_precompile=true -X:aos:pre_compile_threads=2 -X:aos:cafi=aosadvice.ca -cp dacapo-2006-10-MR2.jar Harness xalan
One task I am going to work on post GSOC is optimizing this code to achieve speed up and polishing up this code to make it easy for the jikes community to use this code if they chose to.
One task I am going to work on post GSOC is optimizing this code to achieve speed up and polishing up this code to make it easy for the jikes community to use this code if they chose to.
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