Reduce allocations in TSI TagSets implementation #10190
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ghost
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Since all tag sets are materialised to strings before this method returns, a large number of allocations can be avoided by carefully resuing buffers and containers. This commit reduces allocations by about 75%, which can be very significant for high cardinality workloads. The benchmark results shown below are for a benchmark that asks for all series keys matching `tag5=value0'. name old time/op new time/op delta Index_ConcurrentWriteQuery/inmem/queries_100000-8 5.66s ± 4% 5.70s ± 5% ~ (p=0.739 n=10+10) Index_ConcurrentWriteQuery/tsi1/queries_100000-8 26.5s ± 8% 26.8s ±12% ~ (p=0.579 n=10+10) IndexSet_TagSets/1M_series/inmem-8 11.9ms ±18% 10.4ms ± 2% -12.81% (p=0.000 n=10+10) IndexSet_TagSets/1M_series/tsi1-8 23.4ms ± 5% 18.9ms ± 1% -19.07% (p=0.000 n=10+9) name old alloc/op new alloc/op delta Index_ConcurrentWriteQuery/inmem/queries_100000-8 2.50GB ± 0% 2.50GB ± 0% ~ (p=0.315 n=10+10) Index_ConcurrentWriteQuery/tsi1/queries_100000-8 32.6GB ± 0% 32.6GB ± 0% ~ (p=0.247 n=10+10) IndexSet_TagSets/1M_series/inmem-8 3.56MB ± 0% 3.56MB ± 0% ~ (all equal) IndexSet_TagSets/1M_series/tsi1-8 12.7MB ± 0% 5.2MB ± 0% -59.02% (p=0.000 n=10+10) name old allocs/op new allocs/op delta Index_ConcurrentWriteQuery/inmem/queries_100000-8 24.0M ± 0% 24.0M ± 0% ~ (p=0.353 n=10+10) Index_ConcurrentWriteQuery/tsi1/queries_100000-8 96.6M ± 0% 96.7M ± 0% ~ (p=0.579 n=10+10) IndexSet_TagSets/1M_series/inmem-8 51.0 ± 0% 51.0 ± 0% ~ (all equal) IndexSet_TagSets/1M_series/tsi1-8 80.4k ± 0% 20.4k ± 0% -74.65% (p=0.000 n=10+10)
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Since each series' tags and key do not escape each iteration of the loop in which they're allocated, we can save a provervial tonne by reusing a buffer.