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From "Cody Maloney" <>
Subject Re: Review Request 32558: Improve compile time of mesos by splitting flags
Date Fri, 27 Mar 2015 00:38:00 GMT

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(Updated March 27, 2015, 12:37 a.m.)

Review request for mesos, Joris Van Remoortere and Michael Park.


Add missing include.

Bugs: MESOS-292

Repository: mesos


Split the mesos master, slave flags into header + source file to 
improve compile time significantly. Should be no functional changes.

Largely copy-paste, with a little reworking to remove unnecessary 
headers from the .hpp, and order headers a little more reliably 
(as well as remove duplicate includes) in the .cpp.

# Impact of these changes
`time make check -j8`
make check  2732.93s user 103.89s system 514% cpu 9:11.63 total

make check  2421.18s user 96.60s system 506% cpu 8:16.67 total

4 core machine, 8 hypter threads enabled. SSD, 16 GB RAM, 
Intel i7-4790K.

The numbers aren't incredibly stable (Other software running, 
overclocking enabled, etc). They are a good general measure though of

I do a `make check` rather than just `make` because that is what devs
do in a day-to-day flow, and if runtime is significantly impacted, it
will show up.

Test steps:
# Warm cache
../configure --disable-python --disable-java
make check
# Timed build
rm -rf *
../configure --disable-python --disable-java
time make check

Note: Similar, likely greater improvements in compile time would happen
if stout were made to not be header only. Specifically <stout/os.hpp>.

Diffs (updated)

  src/ 7a06c7028eca8164b1f5fdea6a7ecd37ee6826bb 
  src/logging/flags.hpp 4facb33201cee5a82451a13ca05607c875574752 
  src/logging/flags.cpp PRE-CREATION 
  src/master/flags.hpp 85ce3285731c11b464aca6eaaa0a9165c73afebd 
  src/master/flags.cpp PRE-CREATION 
  src/slave/flags.hpp 3da71afad38ae41adefab979dbed2ae0b10a98ef 
  src/slave/flags.cpp PRE-CREATION 



make check on ArchLinux with GCC 4.9.2
make distcheck CentOS 7


Cody Maloney

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