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runtime: bump MaxGcprocs to 32
There was a number of improvements related to GC parallelization: 1. Parallel roots/stacks scanning. 2. Parallel stack shrinking. 3. Per-thread workbuf caches. 4. Workset reduction. Currently 32 threads work well. go.benchmarks:garbage benchmark on 2 x Intel Xeon E5-2690 (16 HT cores) 1 thread/1 processor: time=16405255 cputime=16386223 gc-pause-one=546793975 gc-pause-total=3280763 2 threads/1 processor: time=9043497 cputime=18075822 gc-pause-one=331116489 gc-pause-total=2152257 4 threads/1 processor: time=4882030 cputime=19421337 gc-pause-one=174543105 gc-pause-total=1134530 8 threads/1 processor: time=4134757 cputime=20097075 gc-pause-one=158680588 gc-pause-total=1015555 16 threads/1 processor + HT: time=2006706 cputime=31960509 gc-pause-one=75425744 gc-pause-total=460097 16 threads/2 processors: time=1513373 cputime=23805571 gc-pause-one=56630946 gc-pause-total=345448 32 threads/2 processors + HT: time=1199312 cputime=37592764 gc-pause-one=48945064 gc-pause-total=278986 LGTM=rlh R=golang-codereviews, tracey.brendan, rlh CC=golang-codereviews, khr, rsc https://golang.org/cl/123920043
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@ -141,8 +141,8 @@ enum
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// Max number of threads to run garbage collection.
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// 2, 3, and 4 are all plausible maximums depending
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// on the hardware details of the machine. The garbage
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// collector scales well to 8 cpus.
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MaxGcproc = 8,
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// collector scales well to 32 cpus.
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MaxGcproc = 32,
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};
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// Maximum memory allocation size, a hint for callers.
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