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fn: pre-fork pool for namespace/network speedup (#874)

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* fn: pre-fork pool experimental implementation
This commit is contained in:
Tolga Ceylan
2018-03-23 16:35:35 -07:00
committed by GitHub
parent 0da7d9fcda
commit 0addcb8911
21 changed files with 1484 additions and 14 deletions
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12
api/agent/resource.go
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@@ -388,7 +388,7 @@ func (a *resourceTracker) initializeMemory(cfg *AgentConfig) {
}
// clamp the available memory by head room (for docker, ourselves, other processes)
headRoom, err := getMemoryHeadRoom(availMemory)
headRoom, err := getMemoryHeadRoom(availMemory, cfg)
if err != nil {
logrus.WithError(err).Fatal("Out of memory")
}
@@ -441,11 +441,19 @@ func (a *resourceTracker) initializeMemory(cfg *AgentConfig) {
}
// headroom estimation in order not to consume entire RAM if possible
func getMemoryHeadRoom(usableMemory uint64) (uint64, error) {
func getMemoryHeadRoom(usableMemory uint64, cfg *AgentConfig) (uint64, error) {
// get %10 of the RAM
headRoom := uint64(usableMemory / 10)
// TODO: improve this pre-fork calculation, we should fetch/query this
// instead of estimate below.
// if pre-fork pool is enabled, add 1 MB per pool-item
if cfg != nil && cfg.PreForkPoolSize != 0 {
headRoom += Mem1MB * cfg.PreForkPoolSize
}
// TODO: improve these calculations.
// clamp this with 256MB min -- 5GB max
maxHeadRoom := uint64(5 * Mem1GB)
minHeadRoom := uint64(256 * Mem1MB)