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enhance clarity behind worker count calculation (#444)

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Black Swan 2025-10-07 05:19:17 +03:00 committed by GitHub
parent 66b89e3f6e
commit 73872da86c
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1 changed files with 23 additions and 19 deletions
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42
utils/runtime/runtime.go
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@ -3,47 +3,51 @@ package runtime
import (
"log"
"runtime"
"strconv"
)
const minimumCores = 3
const minCores = 4
const minWorkers = minCores - 1
// WorkerCount returns the number of workers to use CPU bound tasks.
// It will use GOMAXPROCS as a base, and then subtract a number of CPUs
// which are meant to be left for other tasks, such as networking.
func WorkerCount(requested int, validate bool, legacy bool) int {
n := runtime.GOMAXPROCS(0)
cores := runtime.GOMAXPROCS(0)
if validate {
if n < minimumCores {
log.Panic("invalid system configuration, must have at least 3 cores")
if cores < minCores {
log.Panic("invalid system configuration, must have at least " +
strconv.Itoa(minCores) + " cores")
}
if requested > 0 && requested < minimumCores {
log.Panic("invalid worker count, must have at least 3 workers")
if requested > 0 && requested < minWorkers {
log.Panic("invalid worker count, must have at least " +
strconv.Itoa(minWorkers) + " workers")
}
}
if requested > 0 {
return min(requested, n)
return min(requested, cores)
}
if legacy {
switch {
case n == 1:
case cores == 1:
return 1
case n <= 4:
return n - 1
case n <= 16:
return n - 2
case n <= 32:
return n - 3
case n <= 64:
return n - 4
case cores <= 4:
return cores - 1
case cores <= 16:
return cores - 2
case cores <= 32:
return cores - 3
case cores <= 64:
return cores - 4
default:
return n - 5
return cores - 5
}
}
if n == 1 {
if cores == 1 {
return 1
}
return n - 1
return cores - 1
}