esnet / iperf

iperf3: A TCP, UDP, and SCTP network bandwidth measurement tool

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Verbose output (--verbose) breaks JSON output (--json) #1365

Open TheRealDJ opened 2 years ago

TheRealDJ commented 2 years ago

Context

Version of iperf3: 3.11
Hardware: ODROID-C2
Operating system (and distribution, if any): Linux (Ubuntu 20.04 LTS)
Other relevant information (for example, non-default compilers, libraries, cross-compiling, etc.): N/A

Bug Report

Expected Behavior With --json specified, the output of STDOUT should be working JSON
Actual Behavior With --verbose in conjunction with --json, the verbose output messages are sent to STDOUT along with JSON, breaking JSON
Steps to Reproduce iperf3 --client XXX ... --verbose --json
Possible Solution Output verbose messages to STDERR (at least when --json is used also).

bmah888 commented 2 years ago

On one hand, this behavior shouldn't be a surprise because iperf3 prints this warning if you try to use those two features together:

warning: Verbose output (-v) may interfere with JSON output (-J)

On the other hand it'd probably be good if iperf3 didn't do that.

TheRealDJ commented 2 years ago

Can't the debug output be outputted to STDERR to resolve this?