TimeRequery

Frequency of system time queries; lower values yield more precise timestamps.

This parameter applies to imudp: UDP Syslog Input Module.

Name:

TimeRequery

Scope:

module

Type:

integer

Default:

module=2

Required?:

no

Introduced:

at least 5.x, possibly earlier

Description

This is a performance optimization. Getting the system time is very costly. With this setting, imudp can be instructed to obtain the precise time only once every n-times. This logic is only activated if messages come in at a very fast rate, so doing less frequent time calls should usually be acceptable. The default value is two, because we have seen that even without optimization the kernel often returns twice the identical time. You can set this value as high as you like, but do so at your own risk. The higher the value, the less precise the timestamp.

Note

The time requery is based on executed system calls, not messages received. When batch sizes are used, multiple messages are obtained with one system call and all receive the same timestamp. At very high traffic the requery logic means time is queried only for every second batch by default. Do not set TimeRequery above 10 when input batches are used.

Module usage

module(load="imudp" TimeRequery="...")

Legacy names (for reference)

Historic names/directives for compatibility. Do not use in new configs.

  • $UDPServerTimeRequery — maps to TimeRequery (status: legacy)

See also

See also imudp: UDP Syslog Input Module.

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