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