Hi! I would like to save the output of Julia 0.7 Logging macros @warn, @error, @debug and @info into a log file. How can I do that? Thanks in advance,

Just as a complement to @ExpandingMan ’s example; you need to flush or close before anything is printed to file, example: julia> using Logging julia> io = open("log.txt", "w+"); julia> logger = SimpleLogger(io); julia> with_logger(logger) do @info(" here is some context specific loggin…

using Logging logger = SimpleLogger(open("log1.txt", "w+")) with_logger(logger) do @info(" here is some context specific logging") end global_logger(logger) @info("All logs will use the global logger by default.") see here . The docs could definitely use some improvement in this area, by th…

Also a highly desirable default that seems to be missing is something like MultiLogger which spits out logs in multiple places. Right now it looks like you’d have to implement your own, which is unfortunate since this is probably one of the most common use cases (at least to stdout and a file). If…

That stuff seems really useful, but doesn’t write anything to the file on Julia v0.7.0 on my Mac though. Am I the only one with that issue? Version 0.7.0 (2018-08-08 06:46 UTC) Official http://julialang.org/ release x86_64-apple-darwin14.5.0

[image] ExpandingMan: The docs could definitely use some improvement in this area, by the way. Took me a little while the first time I figured out the above. Please, do everyone a favour and try to improve the documentation. This is something most of us need at some point.

Thanks @ExpandingMan and @fredrikekre ! That works perfectly. I tested it using Ubuntu and Julia 1.0 I was thinking that maybe the logging macros should call flush any time they are invoked. Is that sensible? It will be sad to lose log messages if the program ends abruptly before it reaches the clo…

[image] Diego_Javier_Zea: I was thinking that maybe the logging macros should call flush any time they are invoked. Is that sensible? Not really. That might make sense for files, but not other IO types. The real problem here is that there are a handful of default loggers that really should …

I’m currently in the process of developing a package providing (at first) a simple FileLogger and a general IOLogger, with a File/IO distinction on a LogLevel-basis. I’d be willing to provide the code to base once I’m done with a basic functioning core, but from what I’ve seen in the issues/files, t…

@Sukera , do you have a repository for IOLogging.jl? Leaving flushing up to the user is key to speed.

Not publicy available yet, probably sometime next week. Only the files created by the FileLogger are automatically flushed after writing to them, since you theoretically want to read from them as soon as possible. General IOLogging is not flushed, since those are not generally flushable. There’s al…

Thanks, Sukera. I’d open an issue on the repo if it was available now. I’m looking forward to probably implementing IOLogging in my own code. There’s a custom logger for monitoring of multiple sockets / processes in JuliaWeb/WebSockets.jl. It’s there for historical reasons and was never quite up to …

How to save Logging output to a log file?

General Usage

Tero_Frondelius August 26, 2018, 8:00am 5

Please, do everyone a favour and try to improve the documentation. This is something most of us need at some point.

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How to save Logging output to a log file?

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