func (s *SpcInfo) sendio(wg *sync.WaitGroup,
iostream <-chan *IoStats,
iotime chan<- *IoStats) {
defer wg.Done()
buffer := make([]byte, 4*KB*64)
for iostat := range iostream {
// Make sure the io is correct
io := iostat.Io
godbc.Invariant(io)
if io.Asu == 3 {
s.asus[ASU3].WriteAt(
buffer[0:io.Blocks*4*KB],
int64(io.Offset)*int64(4*KB))
} else {
// Send the io
if io.Isread {
if s.pblcache == nil {
s.asus[io.Asu-1].ReadAt(buffer[0:io.Blocks*4*KB],
int64(io.Offset)*4*KB)
} else {
read(s.asus[io.Asu-1],
s.pblcache,
io.Asu,
io.Offset,
io.Blocks,
buffer[0:io.Blocks*4*KB])
}
} else {
if s.pblcache == nil {
s.asus[io.Asu-1].WriteAt(buffer[0:io.Blocks*4*KB],
int64(io.Offset)*4*KB)
} else {
write(s.asus[io.Asu-1],
s.pblcache,
io.Asu,
io.Offset,
io.Blocks,
buffer[0:io.Blocks*4*KB])
}
}
}
// Report back the latency
iostat.Latency = time.Now().Sub(iostat.Start)
iotime <- iostat
}
}
// Use as a goroutine to start the io workload
// Create one of these per context set on Spc1Init()
func (s *SpcInfo) Context(wg *sync.WaitGroup,
iotime chan<- *IoStats,
quit <-chan struct{},
runlen, context int) {
defer wg.Done()
// Spc generator specifies that each context have
// 8 io streams. Spc generator will specify which
// io stream to use.
streams := 8
iostreams := make([]chan *IoStats, streams)
var iostreamwg sync.WaitGroup
for stream := 0; stream < streams; stream++ {
// Allow for queued requests
iostreams[stream] = make(chan *IoStats, 64)
// Create 32 io contexts per stream
for i := 0; i < 32; i++ {
iostreamwg.Add(1)
go s.sendio(&iostreamwg, iostreams[stream], iotime)
}
}
start := time.Now()
lastiotime := start
stop := time.After(time.Second * time.Duration(runlen))
ioloop := true
for ioloop {
select {
case <-quit:
ioloop = false
case <-stop:
ioloop = false
default:
// Get the next io
io := spc1.NewSpc1Io(context)
err := io.Generate()
godbc.Check(err == nil)
godbc.Invariant(io)
// Check how much time we should wait
sleep_time := start.Add(io.When).Sub(lastiotime)
if sleep_time > 0 {
time.Sleep(sleep_time)
}
// Send io to io stream
iostreams[io.Stream] <- &IoStats{
Io: io,
Start: time.Now(),
}
lastiotime = time.Now()
}
}
// close the streams for this context
for stream := 0; stream < streams; stream++ {
close(iostreams[stream])
}
iostreamwg.Wait()
}