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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
// Author: arnej
package prog
import (
"fmt"
"strconv"
"strings"
"github.com/vespa-engine/vespa/client/go/internal/admin/envvars"
"github.com/vespa-engine/vespa/client/go/internal/admin/trace"
"github.com/vespa-engine/vespa/client/go/internal/util"
)
const (
NUMACTL_PROG = "numactl"
)
func (p *Spec) ConfigureNumaCtl() {
p.shouldUseNumaCtl = false
p.numaSocket = -1
if p.Getenv(envvars.VESPA_NO_NUMACTL) != "" {
return
}
backticks := util.BackTicksIgnoreStderr
out, err := backticks.Run(NUMACTL_PROG, "--hardware")
trace.Debug("numactl --hardware says:", out)
if err != nil {
trace.Trace("numactl error:", err)
return
}
outfoo, errfoo := backticks.Run(NUMACTL_PROG, "--interleave", "all", "echo", "foo")
if errfoo != nil {
trace.Trace("cannot run with numactl:", errfoo)
return
}
if outfoo != "foo\n" {
trace.Trace("bad numactl output:", outfoo)
return
}
p.shouldUseNumaCtl = true
if affinity := p.Getenv(envvars.VESPA_AFFINITY_CPU_SOCKET); affinity != "" {
wantSocket, _ := strconv.Atoi(affinity)
trace.Debug("want socket:", wantSocket)
parts := strings.Fields(out)
for idx := 0; idx+2 < len(parts); idx++ {
if parts[idx] == "available:" && parts[idx+2] == "nodes" {
numSockets, _ := strconv.Atoi(parts[idx+1])
trace.Debug("numSockets:", numSockets)
if numSockets > 1 {
p.numaSocket = (wantSocket % numSockets)
return
}
}
}
}
}
func (p *Spec) prependNumaCtl(args []string) []string {
result := make([]string, 0, 5+len(args))
result = append(result, NUMACTL_PROG)
if p.numaSocket >= 0 {
result = append(result, fmt.Sprintf("--cpunodebind=%d", p.numaSocket))
result = append(result, fmt.Sprintf("--membind=%d", p.numaSocket))
} else {
result = append(result, "--interleave")
result = append(result, "all")
}
for _, arg := range args {
result = append(result, arg)
}
return result
}
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