Brian Brazil cf76daed2f Avoid WriteAt for Postings. ... Flushing buffers and doing a pwrite per posting is expensive time wise, so go back to the old way for those. This doubles our memory usage, but that's still small as it's only ~8 bytes per time series in the index. This is 30-40% faster. benchmark old ns/op new ns/op delta BenchmarkCompactionFromHead/labelnames=1,labelvalues=100000-4 1101429174 724362123 -34.23% BenchmarkCompactionFromHead/labelnames=10,labelvalues=10000-4 1074466374 720977022 -32.90% BenchmarkCompactionFromHead/labelnames=100,labelvalues=1000-4 1166510282 677702636 -41.90% BenchmarkCompactionFromHead/labelnames=1000,labelvalues=100-4 1075013071 696855960 -35.18% BenchmarkCompactionFromHead/labelnames=10000,labelvalues=10-4 1231673790 829328610 -32.67% benchmark old allocs new allocs delta BenchmarkCompactionFromHead/labelnames=1,labelvalues=100000-4 832571 731435 -12.15% BenchmarkCompactionFromHead/labelnames=10,labelvalues=10000-4 894875 793823 -11.29% BenchmarkCompactionFromHead/labelnames=100,labelvalues=1000-4 912931 811804 -11.08% BenchmarkCompactionFromHead/labelnames=1000,labelvalues=100-4 933511 832366 -10.83% BenchmarkCompactionFromHead/labelnames=10000,labelvalues=10-4 1022791 921554 -9.90% benchmark old bytes new bytes delta BenchmarkCompactionFromHead/labelnames=1,labelvalues=100000-4 129063496 126472364 -2.01% BenchmarkCompactionFromHead/labelnames=10,labelvalues=10000-4 124154888 122300764 -1.49% BenchmarkCompactionFromHead/labelnames=100,labelvalues=1000-4 128790648 126394856 -1.86% BenchmarkCompactionFromHead/labelnames=1000,labelvalues=100-4 120570696 118946548 -1.35% BenchmarkCompactionFromHead/labelnames=10000,labelvalues=10-4 138754288 136317432 -1.76% Signed-off-by: Brian Brazil <brian.brazil@robustperception.io>		2019-12-16 15:30:49 +00:00
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encoding.go	Avoid WriteAt for Postings.	2019-12-16 15:30:49 +00:00