Measure import time for each module in Phobos

output.md

module	bare import time
std.regex	1.04s
std.net.curl	0.29s
std.zip	0.19s
std.path	0.15s
std.socket	0.15s
std.file	0.14s
std.mmfile	0.14s
std.datetime	0.14s
std.string	0.12s
std.encoding	0.12s
std.uni	0.09s
std.concurrency	0.09s
std.process	0.05s
std.zlib	0.04s
std.getopt	0.04s
std.bigint	0.04s
std.numeric	0.04s
std.algorithm	0.04s
std.uuid	0.03s
std.stdio	0.03s
std.range	0.03s
std.variant	0.03s
std.bitmanip	0.03s
std.parallelism	0.03s
std.utf	0.02s
std.csv	0.02s
std.json	0.02s
std.array	0.02s
std.signals	0.02s
std.complex	0.02s
std.typecons	0.02s
std.container	0.02s
std.mathspecial	0.02s
std.xml	0.01s
std.uri	0.01s
std.meta	0.01s
std.math	0.01s
std.conv	0.01s
std.traits	0.01s
std.stdint	0.01s
std.random	0.01s
std.format	0.01s
std.digest	0.01s
std.base64	0.01s
std.exception	0.01s
std.functional	0.01s
std.ascii	0.00s
std.system	0.00s
std.demangle	0.00s
std.compiler	0.00s
std.outbuffer	0.00s

test.sh

modules=(
    "std.algorithm" \
    "std.array" \
    "std.ascii" \
    "std.base64" \
    "std.bigint" \
    "std.bitmanip" \
    "std.compiler" \
    "std.complex" \
    "std.concurrency" \
    "std.container" \
    "std.conv" \
    "std.csv" \
    "std.datetime" \
    "std.demangle" \
    "std.digest" \
    "std.encoding" \
    "std.exception" \
    "std.file" \
    "std.format" \
    "std.functional" \
    "std.getopt" \
    "std.json" \
    "std.math" \
    "std.mathspecial" \
    "std.meta" \
    "std.mmfile" \
    "std.net.curl" \
    "std.numeric" \
    "std.outbuffer" \
    "std.parallelism" \
    "std.path" \
    "std.process" \
    "std.random" \
    "std.range" \
    "std.regex" \
    "std.signals" \
    "std.socket" \
    "std.stdint" \
    "std.stdio" \
    "std.string" \
    "std.system" \
    "std.traits" \
    "std.typecons" \
    "std.uni" \
    "std.uri" \
    "std.utf" \
    "std.uuid" \
    "std.variant" \
    "std.xml" \
    "std.zip" \
    "std.zlib" \
)
echo "module             | bare import time"
echo "-------------------|-----------------"
(for module in "${modules[@]}" ; do
    echo "import ${module};" > "test.d"
    usedTime=$(/usr/bin/time -f "%e" dmd -c -o- test.d 2>&1 | xargs echo -n)
    printf "%-18s | %s\n" "${module}" "${usedTime}s"
done) | sort -k2 -r
rm -f test.d