diff options
Diffstat (limited to 'src/runtime/profbuf_test.go')
| -rw-r--r-- | src/runtime/profbuf_test.go | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/src/runtime/profbuf_test.go b/src/runtime/profbuf_test.go new file mode 100644 index 0000000..d9c5264 --- /dev/null +++ b/src/runtime/profbuf_test.go @@ -0,0 +1,182 @@ +// Copyright 2017 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package runtime_test + +import ( + "reflect" + . "runtime" + "testing" + "time" + "unsafe" +) + +func TestProfBuf(t *testing.T) { + const hdrSize = 2 + + write := func(t *testing.T, b *ProfBuf, tag unsafe.Pointer, now int64, hdr []uint64, stk []uintptr) { + b.Write(&tag, now, hdr, stk) + } + read := func(t *testing.T, b *ProfBuf, data []uint64, tags []unsafe.Pointer) { + rdata, rtags, eof := b.Read(ProfBufNonBlocking) + if !reflect.DeepEqual(rdata, data) || !reflect.DeepEqual(rtags, tags) { + t.Fatalf("unexpected profile read:\nhave data %#x\nwant data %#x\nhave tags %#x\nwant tags %#x", rdata, data, rtags, tags) + } + if eof { + t.Fatalf("unexpected eof") + } + } + readBlock := func(t *testing.T, b *ProfBuf, data []uint64, tags []unsafe.Pointer) func() { + c := make(chan int) + go func() { + eof := data == nil + rdata, rtags, reof := b.Read(ProfBufBlocking) + if !reflect.DeepEqual(rdata, data) || !reflect.DeepEqual(rtags, tags) || reof != eof { + // Errorf, not Fatalf, because called in goroutine. + t.Errorf("unexpected profile read:\nhave data %#x\nwant data %#x\nhave tags %#x\nwant tags %#x\nhave eof=%v, want %v", rdata, data, rtags, tags, reof, eof) + } + c <- 1 + }() + time.Sleep(10 * time.Millisecond) // let goroutine run and block + return func() { + select { + case <-c: + case <-time.After(1 * time.Second): + t.Fatalf("timeout waiting for blocked read") + } + } + } + readEOF := func(t *testing.T, b *ProfBuf) { + rdata, rtags, eof := b.Read(ProfBufBlocking) + if rdata != nil || rtags != nil || !eof { + t.Errorf("unexpected profile read: %#x, %#x, eof=%v; want nil, nil, eof=true", rdata, rtags, eof) + } + rdata, rtags, eof = b.Read(ProfBufNonBlocking) + if rdata != nil || rtags != nil || !eof { + t.Errorf("unexpected profile read (non-blocking): %#x, %#x, eof=%v; want nil, nil, eof=true", rdata, rtags, eof) + } + } + + myTags := make([]byte, 100) + t.Logf("myTags is %p", &myTags[0]) + + t.Run("BasicWriteRead", func(t *testing.T) { + b := NewProfBuf(2, 11, 1) + write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) + read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9}, []unsafe.Pointer{unsafe.Pointer(&myTags[0])}) + read(t, b, nil, nil) // release data returned by previous read + write(t, b, unsafe.Pointer(&myTags[2]), 99, []uint64{101, 102}, []uintptr{201, 202, 203, 204}) + read(t, b, []uint64{8, 99, 101, 102, 201, 202, 203, 204}, []unsafe.Pointer{unsafe.Pointer(&myTags[2])}) + }) + + t.Run("ReadMany", func(t *testing.T) { + b := NewProfBuf(2, 50, 50) + write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) + write(t, b, unsafe.Pointer(&myTags[2]), 99, []uint64{101, 102}, []uintptr{201, 202, 203, 204}) + write(t, b, unsafe.Pointer(&myTags[1]), 500, []uint64{502, 504}, []uintptr{506}) + read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 8, 99, 101, 102, 201, 202, 203, 204, 5, 500, 502, 504, 506}, []unsafe.Pointer{unsafe.Pointer(&myTags[0]), unsafe.Pointer(&myTags[2]), unsafe.Pointer(&myTags[1])}) + }) + + t.Run("ReadManyShortData", func(t *testing.T) { + b := NewProfBuf(2, 50, 50) + write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) + write(t, b, unsafe.Pointer(&myTags[2]), 99, []uint64{101, 102}, []uintptr{201, 202, 203, 204}) + read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 8, 99, 101, 102, 201, 202, 203, 204}, []unsafe.Pointer{unsafe.Pointer(&myTags[0]), unsafe.Pointer(&myTags[2])}) + }) + + t.Run("ReadManyShortTags", func(t *testing.T) { + b := NewProfBuf(2, 50, 50) + write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) + write(t, b, unsafe.Pointer(&myTags[2]), 99, []uint64{101, 102}, []uintptr{201, 202, 203, 204}) + read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 8, 99, 101, 102, 201, 202, 203, 204}, []unsafe.Pointer{unsafe.Pointer(&myTags[0]), unsafe.Pointer(&myTags[2])}) + }) + + t.Run("ReadAfterOverflow1", func(t *testing.T) { + // overflow record synthesized by write + b := NewProfBuf(2, 16, 5) + write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) // uses 10 + read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9}, []unsafe.Pointer{unsafe.Pointer(&myTags[0])}) // reads 10 but still in use until next read + write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5}) // uses 6 + read(t, b, []uint64{6, 1, 2, 3, 4, 5}, []unsafe.Pointer{unsafe.Pointer(&myTags[0])}) // reads 6 but still in use until next read + // now 10 available + write(t, b, unsafe.Pointer(&myTags[2]), 99, []uint64{101, 102}, []uintptr{201, 202, 203, 204, 205, 206, 207, 208, 209}) // no room + for i := 0; i < 299; i++ { + write(t, b, unsafe.Pointer(&myTags[3]), int64(100+i), []uint64{101, 102}, []uintptr{201, 202, 203, 204}) // no room for overflow+this record + } + write(t, b, unsafe.Pointer(&myTags[1]), 500, []uint64{502, 504}, []uintptr{506}) // room for overflow+this record + read(t, b, []uint64{5, 99, 0, 0, 300, 5, 500, 502, 504, 506}, []unsafe.Pointer{nil, unsafe.Pointer(&myTags[1])}) + }) + + t.Run("ReadAfterOverflow2", func(t *testing.T) { + // overflow record synthesized by read + b := NewProfBuf(2, 16, 5) + write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) + write(t, b, unsafe.Pointer(&myTags[2]), 99, []uint64{101, 102}, []uintptr{201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213}) + for i := 0; i < 299; i++ { + write(t, b, unsafe.Pointer(&myTags[3]), 100, []uint64{101, 102}, []uintptr{201, 202, 203, 204}) + } + read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9}, []unsafe.Pointer{unsafe.Pointer(&myTags[0])}) // reads 10 but still in use until next read + write(t, b, unsafe.Pointer(&myTags[1]), 500, []uint64{502, 504}, []uintptr{}) // still overflow + read(t, b, []uint64{5, 99, 0, 0, 301}, []unsafe.Pointer{nil}) // overflow synthesized by read + write(t, b, unsafe.Pointer(&myTags[1]), 500, []uint64{502, 505}, []uintptr{506}) // written + read(t, b, []uint64{5, 500, 502, 505, 506}, []unsafe.Pointer{unsafe.Pointer(&myTags[1])}) + }) + + t.Run("ReadAtEndAfterOverflow", func(t *testing.T) { + b := NewProfBuf(2, 12, 5) + write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) + write(t, b, unsafe.Pointer(&myTags[2]), 99, []uint64{101, 102}, []uintptr{201, 202, 203, 204}) + for i := 0; i < 299; i++ { + write(t, b, unsafe.Pointer(&myTags[3]), 100, []uint64{101, 102}, []uintptr{201, 202, 203, 204}) + } + read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9}, []unsafe.Pointer{unsafe.Pointer(&myTags[0])}) + read(t, b, []uint64{5, 99, 0, 0, 300}, []unsafe.Pointer{nil}) + write(t, b, unsafe.Pointer(&myTags[1]), 500, []uint64{502, 504}, []uintptr{506}) + read(t, b, []uint64{5, 500, 502, 504, 506}, []unsafe.Pointer{unsafe.Pointer(&myTags[1])}) + }) + + t.Run("BlockingWriteRead", func(t *testing.T) { + b := NewProfBuf(2, 11, 1) + wait := readBlock(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9}, []unsafe.Pointer{unsafe.Pointer(&myTags[0])}) + write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) + wait() + wait = readBlock(t, b, []uint64{8, 99, 101, 102, 201, 202, 203, 204}, []unsafe.Pointer{unsafe.Pointer(&myTags[2])}) + time.Sleep(10 * time.Millisecond) + write(t, b, unsafe.Pointer(&myTags[2]), 99, []uint64{101, 102}, []uintptr{201, 202, 203, 204}) + wait() + wait = readBlock(t, b, nil, nil) + b.Close() + wait() + wait = readBlock(t, b, nil, nil) + wait() + readEOF(t, b) + }) + + t.Run("DataWraparound", func(t *testing.T) { + b := NewProfBuf(2, 16, 1024) + for i := 0; i < 10; i++ { + write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) + read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9}, []unsafe.Pointer{unsafe.Pointer(&myTags[0])}) + read(t, b, nil, nil) // release data returned by previous read + } + }) + + t.Run("TagWraparound", func(t *testing.T) { + b := NewProfBuf(2, 1024, 2) + for i := 0; i < 10; i++ { + write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) + read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9}, []unsafe.Pointer{unsafe.Pointer(&myTags[0])}) + read(t, b, nil, nil) // release data returned by previous read + } + }) + + t.Run("BothWraparound", func(t *testing.T) { + b := NewProfBuf(2, 16, 2) + for i := 0; i < 10; i++ { + write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) + read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9}, []unsafe.Pointer{unsafe.Pointer(&myTags[0])}) + read(t, b, nil, nil) // release data returned by previous read + } + }) +} |