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https://github.com/zrepl/zrepl.git
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10a14a8c50
package trace:
- introduce the concept of tasks and spans, tracked as linked list within ctx
- see package-level docs for an overview of the concepts
- **main feature 1**: unique stack of task and span IDs
- makes it easy to follow a series of log entries in concurrent code
- **main feature 2**: ability to produce a chrome://tracing-compatible trace file
- either via an env variable or a `zrepl pprof` subcommand
- this is not a CPU profile, we already have go pprof for that
- but it is very useful to visually inspect where the
replication / snapshotter / pruner spends its time
( fixes #307 )
usage in package daemon/logging:
- goal: every log entry should have a trace field with the ID stack from package trace
- make `logging.GetLogger(ctx, Subsys)` the authoritative `logger.Logger` factory function
- the context carries a linked list of injected fields which
`logging.GetLogger` adds to the logger it returns
- `logging.GetLogger` also uses package `trace` to get the
task-and-span-stack and injects it into the returned logger's fields
59 lines
1.1 KiB
Go
59 lines
1.1 KiB
Go
package trace
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import (
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"fmt"
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"sync"
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"sync/atomic"
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"testing"
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"github.com/stretchr/testify/require"
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"github.com/willf/bitset"
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)
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func TestBitsetFeaturesForUniqueConcurrentTaskNamer(t *testing.T) {
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var b bitset.BitSet
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require.Equal(t, uint(0), b.Len())
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require.Equal(t, uint(0), b.Count())
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b.Set(0)
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require.Equal(t, uint(1), b.Len())
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require.Equal(t, uint(1), b.Count())
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b.Set(8)
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require.Equal(t, uint(9), b.Len())
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require.Equal(t, uint(2), b.Count())
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b.Set(1)
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require.Equal(t, uint(9), b.Len())
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require.Equal(t, uint(3), b.Count())
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}
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func TestUniqueConcurrentTaskNamer(t *testing.T) {
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namer := newUniqueTaskNamer()
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var wg sync.WaitGroup
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const N = 8128
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const Q = 23
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var fails uint32
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var m sync.Map
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wg.Add(N)
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for i := 0; i < N; i++ {
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go func(i int) {
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defer wg.Done()
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name := fmt.Sprintf("%d", i/Q)
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uniqueName, done := namer.UniqueConcurrentTaskName(name)
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act, _ := m.LoadOrStore(uniqueName, i)
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if act.(int) != i {
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atomic.AddUint32(&fails, 1)
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}
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m.Delete(uniqueName)
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done()
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}(i)
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}
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wg.Wait()
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require.Equal(t, uint32(0), fails)
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}
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