GODRIVER-2907 Add bulk decryption benchmarks

[prestonvasquez]

GODRIVER-2907

Summary

DRIVERS-2581 makes the mongocrypt_binary_t structure public, meaning we can initialize and assign the data and length directly:

mongocryptBinary := C.mongocrypt_binary_new() // Allocate memory 
if mongocryptBinary == nil {
	return nil
}

addr := (*C.uint8_t)(C.CBytes(data))

mongocryptBinary.data = unsafe.Pointer(addr)
mongocryptBinary.len = C.uint32_t(len(data))

Same with accessing the bytes:

C.GoBytes(unsafe.Pointer(b.wrapped.data), C.int(b.wrapped.len))

Initializing directly:

goos: darwin
goarch: arm64
pkg: go.mongodb.org/mongo-driver/v2/x/mongo/driver/mongocrypt
BenchmarkBulkDecryption
BenchmarkBulkDecryption/threadCount=1
BenchmarkBulkDecryption/threadCount=1-10                     536           2238040 ns/op           40984 B/op          3 allocs/op
testing: BenchmarkBulkDecryption/threadCount=1-10 left GOMAXPROCS set to 1
    binary_test.go:219: thread count: 1, median ops/sec: 447.20
BenchmarkBulkDecryption/threadCount=2
BenchmarkBulkDecryption/threadCount=2-10                    1036           1158261 ns/op           40984 B/op          3 allocs/op
testing: BenchmarkBulkDecryption/threadCount=2-10 left GOMAXPROCS set to 2
    binary_test.go:219: thread count: 2, median ops/sec: 855.48
BenchmarkBulkDecryption/threadCount=8
BenchmarkBulkDecryption/threadCount=8-10                    3078            377137 ns/op           40984 B/op          3 allocs/op
testing: BenchmarkBulkDecryption/threadCount=8-10 left GOMAXPROCS set to 8
    binary_test.go:219: thread count: 8, median ops/sec: 2579.93
BenchmarkBulkDecryption/threadCount=64
BenchmarkBulkDecryption/threadCount=64-10                   3235            356146 ns/op           40988 B/op          3 allocs/op
testing: BenchmarkBulkDecryption/threadCount=64-10 left GOMAXPROCS set to 64
    binary_test.go:219: thread count: 64, median ops/sec: 2718.71
PASS
ok      go.mongodb.org/mongo-driver/v2/x/mongo/driver/mongocrypt        53.710s

Using setter/accessor:

goos: darwin
goarch: arm64
pkg: go.mongodb.org/mongo-driver/v2/x/mongo/driver/mongocrypt
BenchmarkBulkDecryption
BenchmarkBulkDecryption/threadCount=1
BenchmarkBulkDecryption/threadCount=1-10                     541           2221445 ns/op           40984 B/op          3 allocs/op
testing: BenchmarkBulkDecryption/threadCount=1-10 left GOMAXPROCS set to 1
    binary_test.go:219: thread count: 1, median ops/sec: 449.99
BenchmarkBulkDecryption/threadCount=2
BenchmarkBulkDecryption/threadCount=2-10                    1027           1193342 ns/op           40984 B/op          3 allocs/op
testing: BenchmarkBulkDecryption/threadCount=2-10 left GOMAXPROCS set to 2
    binary_test.go:219: thread count: 2, median ops/sec: 858.41
BenchmarkBulkDecryption/threadCount=8
BenchmarkBulkDecryption/threadCount=8-10                    3458            332082 ns/op           40984 B/op          3 allocs/op
testing: BenchmarkBulkDecryption/threadCount=8-10 left GOMAXPROCS set to 8
    binary_test.go:219: thread count: 8, median ops/sec: 1928.17
BenchmarkBulkDecryption/threadCount=64
BenchmarkBulkDecryption/threadCount=64-10                   3604            330883 ns/op           40995 B/op          3 allocs/op
testing: BenchmarkBulkDecryption/threadCount=64-10 left GOMAXPROCS set to 64
    binary_test.go:219: thread count: 64, median ops/sec: 2997.64
PASS
ok      go.mongodb.org/mongo-driver/v2/x/mongo/driver/mongocrypt        53.582s

There does not appear to be extra cost to calling C from Go.

Background & Motivation

Reduce overhead of encryption callbacks by providing bulk-oriented encryption and decryption callbacks

[mongodb-drivers-pr-bot]

API Change Report

No changes found!

[prestonvasquez]

We don't run for the prescribed 1 second because Go benchmarks are designed to automatically determine how long to run a benchmark to achieve stable results. From the docs:

The benchmark function must run the target code b.N times. It is called multiple times with b.N adjusted until the benchmark function lasts long enough to be timed reliably.

[kevinAlbs]

LGTM with minor comments.

[matthewdale]

Looks good! 👍