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malloc_test.go
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malloc_test.go
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package gotcha
import (
"context"
"reflect"
"sync"
"testing"
"github.com/stretchr/testify/require"
)
// epsAlloc defines alloc error delta for test
// as it's tough to carefully trace all possible small
// underlying allocations - defining relative deviation buffer simplifies it
const epsAlloc = 0.66
func TestTraceTypes(t *testing.T) {
t.Run("trace no object alloc", func(t *testing.T) {
Trace(context.Background(), func(ctx Context) {
for i := 0; i < 1000; i++ {
_ = i - 1
}
b, o, c := ctx.Used()
require.Equal(t, int64(0), b)
require.Equal(t, int64(0), o)
require.Equal(t, int64(0), c)
})
})
t.Run("trace new object alloc", func(t *testing.T) {
type sobj struct {
a, b int64
}
Trace(context.Background(), func(ctx Context) {
var v *sobj
for i := 0; i < 1000; i++ {
v = new(sobj)
}
v.a = 0
v.b = 0
b, o, c := ctx.Used()
require.InEpsilon(t, int64(16000), b, epsAlloc)
require.InEpsilon(t, int64(1000), o, epsAlloc)
require.GreaterOrEqual(t, c, int64(1000))
})
})
t.Run("trace new object alloc &", func(t *testing.T) {
type sobj struct {
a, b int64
}
Trace(context.Background(), func(ctx Context) {
var v *sobj
for i := 0; i < 1000; i++ {
v = &sobj{a: 1, b: 1}
}
v.a = 0
v.b = 0
b, o, c := ctx.Used()
require.InEpsilon(t, int64(16000), b, epsAlloc)
require.InEpsilon(t, int64(1000), o, epsAlloc)
require.GreaterOrEqual(t, c, int64(1000))
})
})
t.Run("trace new object alloc reflect", func(t *testing.T) {
type sobj struct {
a, b int64
}
Trace(context.Background(), func(ctx Context) {
var v *sobj = &sobj{}
tp := reflect.ValueOf(*v).Type()
for i := 0; i < 100; i++ {
vref := reflect.New(tp)
v = vref.Interface().(*sobj)
}
v.a = 0
v.b = 0
b, o, c := ctx.Used()
require.InEpsilon(t, int64(1600), b, epsAlloc)
require.InEpsilon(t, int64(100), o, epsAlloc)
require.GreaterOrEqual(t, c, int64(100))
})
})
t.Run("trace make slice alloc", func(t *testing.T) {
Trace(context.Background(), func(ctx Context) {
var v []int64
for i := 0; i < 1000; i++ {
v = make([]int64, 1, 10)
}
v[0] = 0
b, o, c := ctx.Used()
require.InEpsilon(t, int64(80000), b, epsAlloc)
require.InEpsilon(t, int64(10000), o, epsAlloc)
require.GreaterOrEqual(t, c, int64(1000))
})
})
t.Run("trace make slice copy alloc", func(t *testing.T) {
Trace(context.Background(), func(ctx Context) {
var v []int64
vc := []int64{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
for i := 0; i < 1000; i++ {
v = make([]int64, 10)
copy(v, vc)
}
v[0] = 0
b, o, c := ctx.Used()
require.InEpsilon(t, int64(80000), b, epsAlloc)
require.InEpsilon(t, int64(1000), o, epsAlloc)
require.GreaterOrEqual(t, c, int64(1000))
})
})
t.Run("trace make slice append alloc", func(t *testing.T) {
Trace(context.Background(), func(ctx Context) {
var v []int64
for i := 0; i < 1000; i++ {
v = make([]int64, 10)
v = append(v, 1)
}
v[0] = 0
b, o, c := ctx.Used()
require.InEpsilon(t, int64(160000), b, epsAlloc)
require.InEpsilon(t, int64(20000), o, epsAlloc)
require.GreaterOrEqual(t, c, int64(2000))
})
})
t.Run("trace make map alloc", func(t *testing.T) {
Trace(context.Background(), func(ctx Context) {
var v map[string]int32
for i := 0; i < 100; i++ {
v = make(map[string]int32, 15)
}
v[""] = 0
b, o, c := ctx.Used()
require.GreaterOrEqual(t, b, int64(6000))
require.GreaterOrEqual(t, o, int64(100))
require.GreaterOrEqual(t, c, int64(100))
})
})
t.Run("trace make chan alloc", func(t *testing.T) {
Trace(context.Background(), func(ctx Context) {
var v chan [12]byte
for i := 0; i < 100; i++ {
v = make(chan [12]byte, 10)
}
close(v)
b, o, c := ctx.Used()
require.GreaterOrEqual(t, b, int64(1200))
require.GreaterOrEqual(t, o, int64(100))
require.GreaterOrEqual(t, c, int64(100))
})
})
t.Run("trace string bytes alloc", func(t *testing.T) {
Trace(context.Background(), func(ctx Context) {
cs := "foo | | bar"
var v []byte
for i := 0; i < 1000; i++ {
v = []byte(cs)
}
_ = len(v)
b, o, c := ctx.Used()
require.InEpsilon(t, int64(22000), b, epsAlloc)
require.InEpsilon(t, int64(1000), o, epsAlloc)
require.GreaterOrEqual(t, c, int64(1000))
})
})
t.Run("trace string runes alloc", func(t *testing.T) {
Trace(context.Background(), func(ctx Context) {
cs := "foo | | bar"
var v []rune
for i := 0; i < 1000; i++ {
v = []rune(cs)
}
_ = len(v)
b, o, c := ctx.Used()
require.InEpsilon(t, int64(44000), b, epsAlloc)
require.InEpsilon(t, int64(1000), o, epsAlloc)
require.GreaterOrEqual(t, c, int64(1000))
})
})
t.Run("trace bytes string alloc", func(t *testing.T) {
Trace(context.Background(), func(ctx Context) {
cb := []byte("foo | | bar")
var v string
for i := 0; i < 1000; i++ {
v = string(cb)
}
_ = len(v)
b, o, c := ctx.Used()
require.InEpsilon(t, int64(22000), b, epsAlloc)
require.InEpsilon(t, int64(1000), o, epsAlloc)
require.GreaterOrEqual(t, c, int64(1000))
})
})
t.Run("trace new object alloc complex", func(t *testing.T) {
type cobj struct {
mp map[string][]string
self *cobj
}
Trace(context.Background(), func(ctx Context) {
var v *cobj
for i := 0; i < 100; i++ {
v = &cobj{
mp: map[string][]string{
"foo": []string{"foo | | bar"},
},
self: &cobj{},
}
}
_ = v.self
b, o, c := ctx.Used()
require.GreaterOrEqual(t, b, int64(1400))
require.GreaterOrEqual(t, o, int64(100))
require.GreaterOrEqual(t, c, int64(100))
})
})
}
func TestTraceHierarchy(t *testing.T) {
Trace(context.Background(), func(ctx Context) {
var v1, v2, v3 []int64
Trace(ctx, func(ctx Context) {
v1 = make([]int64, 5, 10)
b, o, c := ctx.Used()
require.GreaterOrEqual(t, b, int64(80))
require.GreaterOrEqual(t, o, int64(10))
require.GreaterOrEqual(t, c, int64(1))
})
Trace(ctx, func(ctx Context) {
v2 = make([]int64, 5, 20)
b, o, c := ctx.Used()
require.GreaterOrEqual(t, b, int64(160))
require.GreaterOrEqual(t, o, int64(20))
require.GreaterOrEqual(t, c, int64(1))
Trace(ctx, func(ctx Context) {
v3 = make([]int64, 5, 10)
b, o, c := ctx.Used()
require.GreaterOrEqual(t, b, int64(80))
require.GreaterOrEqual(t, o, int64(10))
require.GreaterOrEqual(t, c, int64(1))
})
Trace(ctx, func(ctx Context) {
v2 = make([]int64, 5, 20)
b, o, c := ctx.Used()
require.GreaterOrEqual(t, b, int64(160))
require.GreaterOrEqual(t, o, int64(20))
require.GreaterOrEqual(t, c, int64(1))
})
var wg sync.WaitGroup
wg.Add(1)
go Trace(ctx, func(ctx Context) {
v2 = make([]int64, 5, 20)
b, o, c := ctx.Used()
require.GreaterOrEqual(t, b, int64(160))
require.GreaterOrEqual(t, o, int64(20))
require.GreaterOrEqual(t, c, int64(1))
wg.Done()
})
wg.Wait()
})
v1[0] = 0
v2[0] = 0
v3[0] = 0
b, o, c := ctx.Used()
require.GreaterOrEqual(t, b, int64(640))
require.GreaterOrEqual(t, o, int64(80))
require.GreaterOrEqual(t, c, int64(5))
})
}