watermarks policy (watchdog.NewWatermarkPolicy()): runs GC at configuredĢ. cgroups-driven (watchdog.CgroupDriven()): discovers the memory limit fromġ. system-driven (watchdog.SystemDriven()): applies a limit to the totalģ. heap-driven (watchdog.HeapDriven()): applies a heap limit, adjusting GOGCĢ.
WATCH DOG INITIALIZATION SOFTWARE LICENSE
Ignorance of system or process limits, can easily cause it to OOM.įor more information, check out these GitHub issues:ĭual-licensed: MIT, Apache Software License v2, by way of the its default policy of scheduling GC when the heap doubles, coupled with its.To date, it is not possible to set a maximum heap size. part of the above is due to the fact that go doesn't concern itself with any.it is incapable of dealing with bursty/spiky allocations efficiently ĭepending on the workload, the program may OOM as a consequence of not.Regards (low-latency, negligible no stop-the-world), but it's insatisfactory inĪ number of situations that yield ill-fated outcomes: The garbage collector that ships with the go runtime is pretty good in some The test execution and docker builds have been conveniently packaged in a This module uses a Docker image for testing, so we can simulate cgroup memory Isolation, so that they don't carry over Go runtime metrics. Given the low-level nature of this component, some tests need to run in Otherwise, try to initialize a system-driven watchdog.Otherwise, try to use the cgroup-driven watchdog.If heap limit is set and legal, initialize a heap-driven watchdog.Limit through an environment variable (e.g. This logic assumes that the library supports setting a heap The recommended way to set up the watchdog is as follows, in descending order You can easily write a custom policy tailored to the allocation patterns of Usage surpasses a dynamically-set threshold. adaptive policy ( watchdog.NewAdaptivePolicy()): runs GC when the current.watermarks policy ( watchdog.NewWatermarkPolicy()): runs GC at configured.That determines when to trigger GC based on the current utilization. The watchdog's behaviour is controlled by the policy, a pluggable function Root cgroup path if the PID = 1 (which indicates that the process is The cgroup of the process (derived from /proc/self/cgroup), or from the cgroups-driven ( watchdog.CgroupDriven()): discovers the memory limit from.System memory used, obtaining the current usage through elastic/go-sigar. system-driven ( watchdog.SystemDriven()): applies a limit to the total.heap-driven ( watchdog.HeapDriven()): applies a heap limit, adjusting GOGCĭynamically in accordance with the policy.Watches memory utilization and forces Go GC in accordance with a Package watchdog runs a singleton memory watchdog in the process, which ? A library to curb OOMs by running Go GC according to a user-defined policy.