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// Copyright 2019 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package config
import (
"os"
"runtime"
"strconv"
"strings"
"github.com/pbnjay/memory"
)
const (
gigabyte = 1 << 30
)
// GetNumWorkerMultiplier returns the base value used to calculate the number
// of workers to use for Hugo's parallel execution.
// It returns the value in HUGO_NUMWORKERMULTIPLIER OS env variable if set to a
// positive integer, else the number of logical CPUs.
func GetNumWorkerMultiplier() int {
if gmp := os.Getenv("HUGO_NUMWORKERMULTIPLIER"); gmp != "" {
if p, err := strconv.Atoi(gmp); err == nil && p > 0 {
return p
}
}
return runtime.NumCPU()
}
// GetMemoryLimit returns the upper memory limit in bytes for Hugo's in-memory caches.
// Note that this does not represent "all of the memory" that Hugo will use,
// so it needs to be set to a lower number than the available system memory.
// It will read from the HUGO_MEMORYLIMIT (in Gigabytes) environment variable.
// If that is not set, it will set aside a quarter of the total system memory.
func GetMemoryLimit() uint64 {
if mem := os.Getenv("HUGO_MEMORYLIMIT"); mem != "" {
if v := stringToGibabyte(mem); v > 0 {
return v
}
}
// There is a FreeMemory function, but as the kernel in most situations
// will take whatever memory that is left and use for caching etc.,
// that value is not something that we can use.
m := memory.TotalMemory()
if m != 0 {
return uint64(m / 4)
}
return 2 * gigabyte
}
func stringToGibabyte(f string) uint64 {
if v, err := strconv.ParseFloat(f, 32); err == nil && v > 0 {
return uint64(v * gigabyte)
}
return 0
}
// SetEnvVars sets vars on the form key=value in the oldVars slice.
func SetEnvVars(oldVars *[]string, keyValues ...string) {
for i := 0; i < len(keyValues); i += 2 {
setEnvVar(oldVars, keyValues[i], keyValues[i+1])
}
}
func SplitEnvVar(v string) (string, string) {
name, value, _ := strings.Cut(v, "=")
return name, value
}
func setEnvVar(vars *[]string, key, value string) {
for i := range *vars {
if strings.HasPrefix((*vars)[i], key+"=") {
(*vars)[i] = key + "=" + value
return
}
}
// New var.
*vars = append(*vars, key+"="+value)
}
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