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app/vmselect: limit the default value for -search.maxConcurrentRequests, so it plays well on systems with more than 16 vCPUs

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A single heavy request can saturate all the available CPUs, so let's limit the number of concurrent requests to lower value.
This will give more chances for executing insert path.
This commit is contained in:
Aliaksandr Valialkin 2020-01-17 15:43:47 +02:00
parent a9f683423c
commit b05f6cf11c
1 changed files with 18 additions and 3 deletions
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21
app/vmselect/main.go
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@ -25,11 +25,26 @@ import (
var (
httpListenAddr = flag.String("httpListenAddr", ":8481", "Address to listen for http connections")
cacheDataPath = flag.String("cacheDataPath", "", "Path to directory for cache files. Cache isn't saved if empty")
maxConcurrentRequests = flag.Int("search.maxConcurrentRequests", runtime.GOMAXPROCS(-1)*2, "The maximum number of concurrent search requests. It shouldn't exceed 2*vCPUs for better performance. See also -search.maxQueueDuration")
maxQueueDuration = flag.Duration("search.maxQueueDuration", 10*time.Second, "The maximum time the request waits for execution when -search.maxConcurrentRequests limit is reached")
storageNodes = flagutil.NewArray("storageNode", "Addresses of vmstorage nodes; usage: -storageNode=vmstorage-host1:8401 -storageNode=vmstorage-host2:8401")
maxConcurrentRequests = flag.Int("search.maxConcurrentRequests", getDefaultMaxConcurrentRequests(), "The maximum number of concurrent search requests. "+
"It shouldn't be high, since a single request can saturate all the CPU cores. See also `-search.maxQueueDuration`")
maxQueueDuration = flag.Duration("search.maxQueueDuration", 10*time.Second, "The maximum time the request waits for execution when -search.maxConcurrentRequests limit is reached")
storageNodes = flagutil.NewArray("storageNode", "Addresses of vmstorage nodes; usage: -storageNode=vmstorage-host1:8401 -storageNode=vmstorage-host2:8401")
)
func getDefaultMaxConcurrentRequests() int {
n := runtime.GOMAXPROCS(-1)
if n <= 4 {
n *= 2
}
if n > 16 {
// A single request can saturate all the CPU cores, so there is no sense
// in allowing higher number of concurrent requests - they will just contend
// for unavailable CPU time.
n = 16
}
return n
}
func main() {
flag.Parse()
buildinfo.Init()