jschoubben
04902ff24a
The operator's desktop slows while it builds: the Go build runtime took 1650% of shanks' 24 processors with nothing holding it back. A build seat's holder now runs its runtime at idle priority under its node's cpu-cap share (declaration Yields, composed from Seat.Yields and the module's cpu-cap setting), and buildcpu/buildstep give each step its part of that cap in threads.
41 lines
1.5 KiB
Go
41 lines
1.5 KiB
Go
package buildstep
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import (
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"encoding/json"
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"os"
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"git.novox.be/novox/mesh-sdk/go/buildcpu"
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)
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// NodeLimits is what one step on node is held to (novox/hq issue 1806): the node's processor cap from the module's
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// settings file at path (buildcpu.Setting, its default when the file does not set it), the machine's processors, and
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// the node's capacity, so the steps that run at once start no more threads together than the cap gives. Read at every
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// call, like the capacity, so a change takes effect at the next step. A file or a setting that cannot be read gives the
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// default cap and says why: a step still runs with a bound, never without one.
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func NodeLimits(path, node string, slots int, logf func(string, ...any)) buildcpu.Limits {
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setting := buildcpu.Defaults
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if path != "" {
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if raw, err := os.ReadFile(path); err != nil {
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sayTo(logf, "the processor cap cannot be read, so %s builds under the default cap: %v", node, err)
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} else {
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var s map[string]any
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if err := json.Unmarshal(raw, &s); err != nil {
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sayTo(logf, "the settings file %s is not JSON, so %s builds under the default cap: %v", path, node, err)
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} else if v, ok := s[buildcpu.Setting].(string); ok {
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setting = v
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}
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}
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}
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l, err := buildcpu.LimitsFor(setting, node, slots)
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if err != nil {
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sayTo(logf, "%v, so %s builds under the default cap of %d%%", err, node, buildcpu.DefaultPercent)
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}
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return l
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}
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func sayTo(logf func(string, ...any), format string, args ...any) {
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if logf != nil {
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logf(format, args...)
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}
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}
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