release-20.2: opt: reduce allocations in Implicator and JoinOrderBuilder #54214
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This commit makes the constructing of the Implicator's constrain cache
map lazy. Instead of making the map in the `Init` method, it is made
only when it is needed.
This fixes performance regressions in microbenchmarks.
name old time/op new time/op delta
Phases/kv-read-const/Normalize-16 170ns ± 0% 139ns ± 0% -18.66% (p=0.008 n=5+5)
Phases/kv-read-const/OptBuild-16 173ns ± 1% 141ns ± 1% -18.38% (p=0.008 n=5+5)
Phases/kv-read-const/Explore-16 183ns ± 1% 151ns ± 0% -17.70% (p=0.008 n=5+5)
Phases/kv-read-const/ExecBuild-16 674ns ± 2% 636ns ± 1% -5.58% (p=0.008 n=5+5)
Phases/kv-read/ExecBuild-16 13.3µs ± 1% 13.1µs ± 1% -1.78% (p=0.008 n=5+5)
Phases/tpcc-delivery/ExecBuild-16 29.4µs ± 1% 28.9µs ± 0% -1.64% (p=0.016 n=5+4)
Phases/tpcc-stock-level/Explore-16 153µs ± 1% 151µs ± 1% -1.24% (p=0.008 n=5+5)
Phases/kv-read-no-prep/Explore-16 42.3µs ± 1% 41.9µs ± 0% -0.85% (p=0.008 n=5+5)
Phases/tpcc-delivery/OptBuild-16 12.1µs ± 1% 12.1µs ± 0% -0.65% (p=0.032 n=5+5)
Phases/kv-read/Parse-16 2.49ns ± 1% 2.48ns ± 0% ~ (p=0.413 n=5+4)
Phases/kv-read/OptBuild-16 6.46µs ± 2% 6.44µs ± 1% ~ (p=0.841 n=5+5)
Phases/kv-read/Normalize-16 6.48µs ± 3% 6.48µs ± 2% ~ (p=1.000 n=5+5)
Phases/kv-read/Explore-16 12.1µs ± 1% 11.9µs ± 2% ~ (p=0.056 n=5+5)
Phases/kv-read-no-prep/OptBuild-16 32.4µs ± 3% 32.2µs ± 1% ~ (p=1.000 n=5+5)
Phases/kv-read-no-prep/Normalize-16 34.9µs ± 1% 34.7µs ± 2% ~ (p=0.222 n=5+5)
Phases/kv-read-no-prep/ExecBuild-16 44.0µs ± 3% 43.7µs ± 1% ~ (p=0.310 n=5+5)
Phases/kv-read-const/Parse-16 2.60ns ± 1% 2.60ns ± 1% ~ (p=0.643 n=5+5)
Phases/tpcc-new-order/Normalize-16 12.8µs ± 1% 13.9µs ±10% ~ (p=0.690 n=5+5)
Phases/tpcc-new-order/ExecBuild-16 38.5µs ± 1% 38.6µs ± 2% ~ (p=1.000 n=5+5)
Phases/tpcc-delivery/Parse-16 2.55ns ± 1% 2.56ns ± 1% ~ (p=0.921 n=5+5)
Phases/tpcc-delivery/Normalize-16 12.6µs ± 2% 12.5µs ± 1% ~ (p=0.151 n=5+5)
Phases/tpcc-delivery/Explore-16 28.0µs ± 2% 27.6µs ± 1% ~ (p=0.063 n=5+5)
Phases/tpcc-stock-level/OptBuild-16 52.8µs ± 1% 52.9µs ± 1% ~ (p=1.000 n=5+5)
Phases/tpcc-stock-level/Normalize-16 53.7µs ± 1% 53.7µs ± 1% ~ (p=1.000 n=5+5)
Phases/tpcc-stock-level/ExecBuild-16 160µs ± 1% 161µs ± 1% ~ (p=0.222 n=5+5)
Phases/tpcc-new-order/Explore-16 36.2µs ± 0% 36.7µs ± 1% +1.47% (p=0.016 n=4+5)
Phases/kv-read-no-prep/Parse-16 12.6µs ± 1% 12.8µs ± 1% +1.58% (p=0.016 n=4+5)
Phases/tpcc-new-order/Parse-16 2.58ns ± 1% 2.67ns ± 7% +3.33% (p=0.048 n=5+5)
Phases/tpcc-stock-level/Parse-16 2.52ns ± 1% 2.63ns ± 4% +4.29% (p=0.016 n=5+5)
Phases/tpcc-new-order/OptBuild-16 13.0µs ± 1% 14.7µs ± 2% +12.50% (p=0.008 n=5+5)
Release note: None
This commit embeds the JoinOrderBuilder in the Optimizer struct. This
avoids allocating a new JoinOrderBuilder on the heap every time
`Optimizer.Init` is called.
BenchmarkPhase microbenchmarks comparing the current master branch to
this commit:
name old time/op new time/op delta
Phases/kv-read-const/Normalize-16 171ns ± 1% 77ns ± 1% -55.11% (p=0.008 n=5+5)
Phases/kv-read-const/OptBuild-16 175ns ± 1% 79ns ± 2% -54.83% (p=0.008 n=5+5)
Phases/kv-read-const/Explore-16 189ns ± 7% 89ns ± 0% -53.14% (p=0.008 n=5+5)
Phases/tpcc-new-order/OptBuild-16 16.6µs ± 6% 12.7µs ± 2% -23.47% (p=0.008 n=5+5)
Phases/tpcc-new-order/Normalize-16 14.7µs ± 8% 12.4µs ± 1% -15.39% (p=0.008 n=5+5)
Phases/kv-read-const/ExecBuild-16 687ns ± 4% 592ns ± 1% -13.89% (p=0.008 n=5+5)
Phases/tpcc-new-order/Parse-16 2.94ns ± 8% 2.58ns ± 2% -12.23% (p=0.008 n=5+5)
Phases/tpcc-delivery/Parse-16 2.86ns ± 8% 2.54ns ± 1% -11.33% (p=0.008 n=5+5)
Phases/tpcc-new-order/ExecBuild-16 43.0µs ±10% 38.6µs ± 0% -10.21% (p=0.016 n=5+4)
Phases/tpcc-new-order/Explore-16 39.0µs ± 3% 36.6µs ± 0% -6.12% (p=0.008 n=5+5)
Phases/tpcc-delivery/OptBuild-16 12.4µs ± 1% 12.0µs ± 0% -3.49% (p=0.008 n=5+5)
Phases/kv-read/ExecBuild-16 13.4µs ± 0% 12.9µs ± 0% -3.37% (p=0.008 n=5+5)
Phases/kv-read/Explore-16 12.1µs ± 1% 11.7µs ± 2% -3.04% (p=0.008 n=5+5)
Phases/tpcc-delivery/Normalize-16 12.8µs ± 1% 12.4µs ± 1% -3.00% (p=0.008 n=5+5)
Phases/kv-read-no-prep/ExecBuild-16 44.1µs ± 2% 43.2µs ± 1% -2.16% (p=0.008 n=5+5)
Phases/kv-read/Normalize-16 6.48µs ± 1% 6.36µs ± 1% -1.73% (p=0.008 n=5+5)
Phases/kv-read-no-prep/Explore-16 42.6µs ± 1% 41.9µs ± 1% -1.55% (p=0.032 n=5+5)
Phases/tpcc-delivery/ExecBuild-16 29.5µs ± 1% 29.1µs ± 0% -1.41% (p=0.008 n=5+5)
Phases/kv-read-no-prep/OptBuild-16 32.2µs ± 0% 31.7µs ± 1% -1.34% (p=0.008 n=5+5)
Phases/kv-read-no-prep/Normalize-16 34.8µs ± 1% 34.4µs ± 1% -1.25% (p=0.016 n=5+4)
Phases/tpcc-stock-level/OptBuild-16 53.1µs ± 0% 52.7µs ± 0% -0.83% (p=0.016 n=5+5)
Phases/kv-read/Parse-16 2.49ns ± 0% 2.49ns ± 1% ~ (p=0.952 n=4+5)
Phases/kv-read/OptBuild-16 6.48µs ± 0% 6.44µs ± 1% ~ (p=0.310 n=5+5)
Phases/kv-read-no-prep/Parse-16 12.7µs ± 2% 12.7µs ± 1% ~ (p=0.508 n=5+5)
Phases/kv-read-const/Parse-16 2.59ns ± 1% 2.59ns ± 1% ~ (p=0.857 n=5+5)
Phases/tpcc-delivery/Explore-16 27.9µs ± 0% 27.9µs ± 2% ~ (p=0.310 n=5+5)
Phases/tpcc-stock-level/Parse-16 2.57ns ± 2% 2.54ns ± 3% ~ (p=0.254 n=5+5)
Phases/tpcc-stock-level/Normalize-16 53.8µs ± 0% 53.5µs ± 2% ~ (p=0.151 n=5+5)
Phases/tpcc-stock-level/Explore-16 153µs ± 0% 152µs ± 3% ~ (p=0.151 n=5+5)
Phases/tpcc-stock-level/ExecBuild-16 162µs ± 1% 161µs ± 1% ~ (p=0.095 n=5+5)
Release note: None
mgartner
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RaduBerinde
approved these changes
Sep 10, 2020
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Backport 2/2 commits from #54159.
/cc @cockroachdb/release
partialidx: lazily initialize the implicator constraint cache
This commit makes the constructing of the Implicator's constrain cache
map lazy. Instead of making the map in the
Initmethod, it is madeonly when it is needed.
This fixes performance regressions in microbenchmarks.
Release note: None
opt: embed JoinOrderBuilder in Optimizer
This commit embeds the JoinOrderBuilder in the Optimizer struct. This
avoids allocating a new JoinOrderBuilder on the heap every time
Optimizer.Initis called.BenchmarkPhase microbenchmarks comparing the current master branch to
this commit:
Release note: None