/
execution.go
167 lines (129 loc) · 3.67 KB
/
execution.go
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package vmcontext
import (
"context"
"os"
"strconv"
"sync"
"github.com/ipfs/go-cid"
"github.com/filecoin-project/venus/venus-shared/types"
)
const (
// DefaultAvailableExecutionLanes is the number of available execution lanes; it is the bound of
// concurrent active executions.
// This is the default value in filecoin-ffi
DefaultAvailableExecutionLanes = 4
// DefaultPriorityExecutionLanes is the number of reserved execution lanes for priority computations.
// This is purely userspace, but we believe it is a reasonable default, even with more available
// lanes.
DefaultPriorityExecutionLanes = 2
)
// the execution environment; see below for definition, methods, and initialization
var execution *executionEnv
// implementation of vm executor with simple sanity check preventing use after free.
type vmExecutor struct {
vmi Interface
lane ExecutionLane
}
var _ Interface = (*vmExecutor)(nil)
func NewVMExecutor(vmi Interface, lane ExecutionLane) Interface {
return &vmExecutor{vmi: vmi, lane: lane}
}
func (e *vmExecutor) ApplyMessage(ctx context.Context, cmsg types.ChainMsg) (*Ret, error) {
token := execution.getToken(e.lane)
defer token.Done()
return e.vmi.ApplyMessage(ctx, cmsg)
}
func (e *vmExecutor) ApplyImplicitMessage(ctx context.Context, msg types.ChainMsg) (*Ret, error) {
token := execution.getToken(e.lane)
defer token.Done()
return e.vmi.ApplyImplicitMessage(ctx, msg)
}
func (e *vmExecutor) Flush(ctx context.Context) (cid.Cid, error) {
return e.vmi.Flush(ctx)
}
type executionToken struct {
lane ExecutionLane
reserved int
}
func (token *executionToken) Done() {
execution.putToken(token)
}
type executionEnv struct {
mx *sync.Mutex
cond *sync.Cond
// available executors
available int
// reserved executors
reserved int
}
func (e *executionEnv) getToken(lane ExecutionLane) *executionToken {
e.mx.Lock()
defer e.mx.Unlock()
switch lane {
case ExecutionLaneDefault:
for e.available <= e.reserved {
e.cond.Wait()
}
e.available--
return &executionToken{lane: lane, reserved: 0}
case ExecutionLanePriority:
for e.available == 0 {
e.cond.Wait()
}
e.available--
reserving := 0
if e.reserved > 0 {
e.reserved--
reserving = 1
}
return &executionToken{lane: lane, reserved: reserving}
default:
// already checked at interface boundary in NewVM, so this is appropriate
panic("bogus execution lane")
}
}
func (e *executionEnv) putToken(token *executionToken) {
e.mx.Lock()
defer e.mx.Unlock()
e.available++
e.reserved += token.reserved
// Note: Signal is unsound, because a priority token could wake up a non-priority
// goroutnie and lead to deadlock. So Broadcast it must be.
e.cond.Broadcast()
}
func init() {
var err error
available := DefaultAvailableExecutionLanes
if concurrency := os.Getenv("LOTUS_FVM_CONCURRENCY"); concurrency != "" {
available, err = strconv.Atoi(concurrency)
if err != nil {
panic(err)
}
if available > 24 {
vmlog.Warnf("LOTUS_FVM_CONCURRENCY is set to a high value that can cause chain sync panics on network "+
"migrations/upgrades, recommend 24 or less during network upgrades, current value: %v", available)
}
}
priority := DefaultPriorityExecutionLanes
if reserved := os.Getenv("LOTUS_FVM_CONCURRENCY_RESERVED"); reserved != "" {
priority, err = strconv.Atoi(reserved)
if err != nil {
panic(err)
}
}
// some sanity checks
if available < 2 {
panic("insufficient execution concurrency")
}
if available <= priority {
panic("insufficient default execution concurrency")
}
mx := &sync.Mutex{}
cond := sync.NewCond(mx)
execution = &executionEnv{
mx: mx,
cond: cond,
available: available,
reserved: priority,
}
}