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kling

Golden template

Freeze once. Instantiate N.

A golden is an artifact of an image, not of a machine. N copies restore from the same file and the kernel shares its pages.

Terminal window
kling save plantilla golden
kling run -from golden -name g1
kling template

Output

golden  golden snapshot  (80M of memory)
instantiate with:  kling run -from golden


a3f9...  g1  instantiated from golden in 34 ms


NAME     IMAGE     CPU/MEM    MEMORY   DISK   INSTANCES   AGE
golden   default   1/256MiB   80M      80M    10          21s

Density

Section titled “Density”
10 from a golden 10 cold
Added RAM +68 MiB +824 MiB
Per machine 6.8 MiB 82 MiB
Time per machine ~40 ms ~2.6 s

On a 4 GB host: 142 microVMs in 3.9 GB, and an explained refusal at number 143 instead of an OOM.

Save only when it is useful

Section titled “Save only when it is useful”

kling save waits for the guest to answer before freezing (-wait, 60 s). A golden taken too early restores in 26 ms and then never answers.

By default it freezes with a warm child process: the golden does not pay the runtime’s startup (300-500 ms of node). -warm=false trades latency for disk.

In the repo: README: golden snapshots · docs/estabilidad.md