113 lines
4.7 KiB
Markdown
113 lines
4.7 KiB
Markdown
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This is much better than `skiplist` and `slist`.
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```
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BenchmarkReadWrite/frac_0-8 3000000 537 ns/op
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BenchmarkReadWrite/frac_1-8 3000000 503 ns/op
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BenchmarkReadWrite/frac_2-8 3000000 492 ns/op
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BenchmarkReadWrite/frac_3-8 3000000 475 ns/op
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BenchmarkReadWrite/frac_4-8 3000000 440 ns/op
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BenchmarkReadWrite/frac_5-8 5000000 442 ns/op
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BenchmarkReadWrite/frac_6-8 5000000 380 ns/op
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BenchmarkReadWrite/frac_7-8 5000000 338 ns/op
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BenchmarkReadWrite/frac_8-8 5000000 294 ns/op
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BenchmarkReadWrite/frac_9-8 10000000 268 ns/op
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BenchmarkReadWrite/frac_10-8 100000000 26.3 ns/op
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```
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And even better than a simple map with read-write lock:
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```
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BenchmarkReadWriteMap/frac_0-8 2000000 774 ns/op
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BenchmarkReadWriteMap/frac_1-8 2000000 647 ns/op
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BenchmarkReadWriteMap/frac_2-8 3000000 605 ns/op
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BenchmarkReadWriteMap/frac_3-8 3000000 603 ns/op
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BenchmarkReadWriteMap/frac_4-8 3000000 556 ns/op
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BenchmarkReadWriteMap/frac_5-8 3000000 472 ns/op
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BenchmarkReadWriteMap/frac_6-8 3000000 476 ns/op
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BenchmarkReadWriteMap/frac_7-8 3000000 457 ns/op
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BenchmarkReadWriteMap/frac_8-8 5000000 444 ns/op
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BenchmarkReadWriteMap/frac_9-8 5000000 361 ns/op
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BenchmarkReadWriteMap/frac_10-8 10000000 212 ns/op
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```
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# Node Pooling
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Command used
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```
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rm -Rf tmp && /usr/bin/time -l ./populate -keys_mil 10
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```
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For pprof results, we run without using /usr/bin/time. There are four runs below.
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Results seem to vary quite a bit between runs.
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## Before node pooling
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```
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1311.53MB of 1338.69MB total (97.97%)
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Dropped 30 nodes (cum <= 6.69MB)
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Showing top 10 nodes out of 37 (cum >= 12.50MB)
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flat flat% sum% cum cum%
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523.04MB 39.07% 39.07% 523.04MB 39.07% github.com/dgraph-io/badger/skl.(*Skiplist).Put
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184.51MB 13.78% 52.85% 184.51MB 13.78% runtime.stringtoslicebyte
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166.01MB 12.40% 65.25% 689.04MB 51.47% github.com/dgraph-io/badger/mem.(*Table).Put
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165MB 12.33% 77.58% 165MB 12.33% runtime.convT2E
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116.92MB 8.73% 86.31% 116.92MB 8.73% bytes.makeSlice
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62.50MB 4.67% 90.98% 62.50MB 4.67% main.newValue
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34.50MB 2.58% 93.56% 34.50MB 2.58% github.com/dgraph-io/badger/table.(*BlockIterator).parseKV
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25.50MB 1.90% 95.46% 100.06MB 7.47% github.com/dgraph-io/badger/y.(*MergeIterator).Next
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21.06MB 1.57% 97.04% 21.06MB 1.57% github.com/dgraph-io/badger/table.(*Table).read
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12.50MB 0.93% 97.97% 12.50MB 0.93% github.com/dgraph-io/badger/table.header.Encode
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128.31 real 329.37 user 17.11 sys
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3355660288 maximum resident set size
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0 average shared memory size
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0 average unshared data size
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0 average unshared stack size
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2203080 page reclaims
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764 page faults
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0 swaps
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275 block input operations
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76 block output operations
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0 messages sent
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0 messages received
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0 signals received
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49173 voluntary context switches
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599922 involuntary context switches
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```
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## After node pooling
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```
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1963.13MB of 2026.09MB total (96.89%)
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Dropped 29 nodes (cum <= 10.13MB)
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Showing top 10 nodes out of 41 (cum >= 185.62MB)
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flat flat% sum% cum cum%
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658.05MB 32.48% 32.48% 658.05MB 32.48% github.com/dgraph-io/badger/skl.glob..func1
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297.51MB 14.68% 47.16% 297.51MB 14.68% runtime.convT2E
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257.51MB 12.71% 59.87% 257.51MB 12.71% runtime.stringtoslicebyte
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249.01MB 12.29% 72.16% 1007.06MB 49.70% github.com/dgraph-io/badger/mem.(*Table).Put
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142.43MB 7.03% 79.19% 142.43MB 7.03% bytes.makeSlice
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100MB 4.94% 84.13% 758.05MB 37.41% github.com/dgraph-io/badger/skl.newNode
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99.50MB 4.91% 89.04% 99.50MB 4.91% main.newValue
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75MB 3.70% 92.74% 75MB 3.70% github.com/dgraph-io/badger/table.(*BlockIterator).parseKV
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44.62MB 2.20% 94.94% 44.62MB 2.20% github.com/dgraph-io/badger/table.(*Table).read
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39.50MB 1.95% 96.89% 185.62MB 9.16% github.com/dgraph-io/badger/y.(*MergeIterator).Next
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135.58 real 374.29 user 17.65 sys
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3740614656 maximum resident set size
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0 average shared memory size
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0 average unshared data size
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0 average unshared stack size
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2276566 page reclaims
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770 page faults
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0 swaps
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128 block input operations
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90 block output operations
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0 messages sent
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0 messages received
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0 signals received
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46434 voluntary context switches
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597049 involuntary context switches
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```
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