-gc updates and VRQ benchmark in 3.17

There is BFS 0458 release for 3.17, I have synced up -gc with it then rebase -gc branch with v3.17.3 then v3.17.4, you can fetch them from my git.

As 0458 BFS released, I kicked off another new branch of testing to get the result of BFS 0458, Baseline of VRQ patch and the VRQ patch.
The result highlighted are
a. For low workload, Baseline&VRQ is ~3 seconds(1%) faster than original BFS.
b. For heavy workload, VRQ is ~5 seconds(3%) faster than original BFS and the baseline code.

It's kind of busy these days I have tried some new idea based on VRQ solution, but the result isn't that good, so I spend most of time in debugging and haven't update the blog, :)

Based on the test result of VRQ, I believe it is a good direction to go. Especially it shows little overhead under heavy load than original BFS. And recently, I am thinking about improving BFS/VRQ by reducing grq usage, but the debug code prove an existed bug in current VRQ code, now I have to rework the whole VRQ code allover again to debug it. So in the coming 0.3 release of VRQ, I plan to fix the known issues in vrq branch and clean-up the code, which will help to stabilize VRQ code and also helpful for new idea which based on VRQ solution. At the meantime, I have update the -gc branch and put detail comments into bfs commits(if needed), hopefully CK will pick-up some of them in next BFS release.

Stay tuned. :D

#1 Jobs/Cores ratio 50%

3.17_0458_50
5m20.933s
5m20.896s
5m20.882s
5m20.867s
5m20.849s
5m20.743s
5m20.663s
5m20.621s
5m20.340s
5m20.251s

3.17_Baseline_50
5m18.065s
5m18.019s
5m17.956s
5m17.953s
5m17.941s
5m17.896s
5m17.891s
5m17.839s
5m17.826s
5m17.794s

3.17_VRQ_50
5m17.897s
5m17.856s
5m17.852s
5m17.788s
5m17.759s
5m17.748s
5m17.721s
5m17.673s
5m17.642s
5m17.634s


#2 Jobs/Cores ratio 150%

3.17_0458_150
2m56.468s
2m56.379s
2m56.377s
2m56.367s
2m56.364s
2m56.335s
2m56.322s
2m56.321s
2m56.261s
2m56.184s

3.17_Baseline_150
2m56.472s
2m56.407s
2m56.341s
2m56.312s
2m56.303s
2m56.293s
2m56.289s
2m56.288s
2m56.259s
2m56.202s

3.17_VRQ_150
2m51.553s
2m51.516s
2m51.473s
2m51.472s
2m51.448s
2m51.379s
2m51.358s
2m51.339s
2m51.338s
2m51.292s

#3 Jobs/Cores ratio 100%

3.17_0458_100
2m52.031s
2m50.718s
2m50.663s
2m50.650s
2m50.624s
2m50.603s
2m50.559s
2m50.541s
2m50.485s
2m50.468s

3.17_Baseline_100
2m50.945s
2m50.719s
2m50.683s
2m50.639s
2m50.602s
2m50.597s
2m50.583s
2m50.530s
2m50.521s
2m50.486s

3.17_VRQ_100
2m49.896s
2m49.675s
2m49.670s
2m49.658s
2m49.604s
2m49.538s
2m49.501s
2m49.480s
2m49.463s
2m49.457s

#4 Jobs/Cores ratio 100%

3.17_0458_100_50
2m52.026s
2m51.384s
2m51.151s
2m51.039s
2m50.983s
2m50.901s
2m50.863s
2m50.852s
2m50.810s
2m50.699s

3.17_Baseline_100_50
2m52.161s
2m51.007s
2m50.934s
2m50.864s
2m50.861s
2m50.857s
2m50.842s
2m50.817s
2m50.789s
2m50.733s

3.17_VRQ_100_50
2m49.801s
2m49.783s
2m49.740s
2m49.730s
2m49.716s
2m49.703s
2m49.700s
2m49.666s
2m49.662s
2m49.606s