The following vignette presents benchmarks for log4r against all general-purpose logging packages available on CRAN:
Each logging package features slightly different capabilities, but these benchmarks are focused on the two situations common to using all of them:
The first of these is likely the most common kind of logging done by end users, although some may chose to log to files, over HTTP, or to the system log (among others). Yet a benchmark of these other scenarios would largely show the relative expense of these operations, instead of the overhead of the logic performed by the logging packages themselves.
The second measures the performance impact of leaving logging messages in running code, even if they are below the current threshold of visibility. This is another measure of overhead for each logging package.
cat()As a reference point, we can measure how long it takes R itself to write a simple message to the console:
The following is a typical log4r setup:
The following is a typical futile.logger setup:
The following is what I believe to be a typical logging setup:
The following is what I believe to be a typical logger setup:
requireNamespace("logger")
#> Loading required namespace: logger
#> Registered S3 method overwritten by 'logger':
#> method from
#> print.loglevel log4r
# Match the behaviour of other logging packages and write to the console.
logger::log_appender(logger::appender_stdout)
logger_info <- function() {
logger::log_info("Info message.")
}
logger_debug <- function() {
logger::log_debug("Debug message.")
}The following is what I believe to be a typical lgr setup:
requireNamespace("lgr")
#> Loading required namespace: lgr
lgr_logger <- lgr::get_logger("perf-test")
lgr_logger$set_appenders(list(cons = lgr::AppenderConsole$new()))
lgr_logger$set_propagate(FALSE)
lgr_info <- function() {
lgr_logger$info("Info message.")
}
lgr_debug <- function() {
lgr_logger$debug("Debug message.")
}The following is what I believe to be a typical
loggit setup. Since we only want to log to the console,
set the output file to /dev/null. In addition,
loggit does not have a notion of thresholds, so there
is no “do nothing” operation to test.
The rlog package currently has no configuration options other than the threshold, which is controlled via an environment variable and defaults to hiding debug-level messages:
Debug messages should print nothing.
Info messages should print to the console. Small differences in output format are to be expected.
log4r_info()
#> INFO [2026-07-01 18:05:11] Info message.
cat_info()
#> INFO [2026-07-01 18:05:11] Info message.
logging_info()
#> 2026-07-01 18:05:11.993222 INFO::Info message.
fl_info()
#> INFO [2026-07-01 18:05:11] Info message.
logger_info()
#> INFO [2026-07-01 18:05:11] Info message.
lgr_info()
loggit_info()
#> {"timestamp": "2026-07-01T18:05:11+0000", "log_lvl": "INFO", "log_msg": "Info message."}
rlog_info()
#> 2026-07-01 18:05:12 [INFO] Info message.The following benchmarks all loggers defined above:
info_bench <- microbenchmark::microbenchmark(
cat = cat_info(),
log4r = log4r_info(),
futile.logger = fl_info(),
logging = logging_info(),
logger = logger_info(),
lgr = lgr_info(),
loggit = loggit_info(),
rlog = rlog_info(),
times = 500,
control = list(warmups = 50)
)
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debug_bench <- microbenchmark::microbenchmark(
cat = cat_debug(),
log4r = log4r_debug(),
futile.logger = fl_debug(),
logging = logging_debug(),
logger = logger_debug(),
lgr = lgr_debug(),
rlog = rlog_debug(),
times = 500,
control = list(warmups = 50)
)print(info_bench, order = "median")
#> Unit: microseconds
#> expr min lq mean median uq max neval
#> log4r 14.667 27.9020 33.31747 31.0655 35.3075 973.255 500
#> cat 26.978 36.3200 46.36387 45.5415 50.1220 1239.381 500
#> rlog 44.789 66.6600 75.26065 75.2170 80.9865 902.711 500
#> logger 156.658 235.8010 265.87455 247.5670 258.1575 7762.566 500
#> logging 245.933 320.9410 354.05188 337.6095 352.5260 7242.244 500
#> futile.logger 486.675 558.3195 586.18791 578.9525 598.1125 2722.535 500
#> lgr 521.419 589.5515 700.65617 607.6050 624.2145 28853.119 500
#> loggit 546.789 600.6240 627.80424 619.1705 636.1985 2878.722 500print(debug_bench, order = "median")
#> Unit: microseconds
#> expr min lq mean median uq max neval
#> cat 1.774 2.1970 4.173080 2.7250 3.3400 661.011 500
#> log4r 2.146 2.6725 5.472280 3.1740 4.1130 999.660 500
#> rlog 5.792 7.0175 9.971624 8.2315 9.4900 706.094 500
#> lgr 11.424 13.4870 17.030786 15.0770 17.4290 706.548 500
#> logger 14.173 16.6305 26.132678 18.5870 21.3785 2671.448 500
#> logging 14.092 16.8645 22.291446 19.8225 23.7650 740.672 500
#> futile.logger 159.812 176.6335 194.707022 184.8885 194.5545 2983.917 500