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Auto merge of #7632 - aidanhs:aphs-speedup-mach-startup, r=metajack

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Speedup mach startup

...by using a 'marker file' to indicate whether we actually need to run pip.

Also a minor tweak for clarity.

Before (consistently):
```
$ time ./mach >/dev/null

real    0m0.666s
user    0m0.477s
sys     0m0.190s
```

After:
```
$ time ./mach >/dev/null # first run

real    0m0.665s
user    0m0.501s
sys     0m0.166s
$ time ./mach >/dev/null

real    0m0.121s
user    0m0.083s
sys     0m0.039s
```

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This commit is contained in:
bors-servo 2015-09-16 14:34:17 -06:00
commit b511004a61
2 changed files with 15 additions and 6 deletions
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2
mach
View file

@ -16,7 +16,7 @@ import sys
def main(args):
topdir = os.path.dirname(sys.argv[0])
sys.path[0:0] = [os.path.join(topdir, "python")]
sys.path.insert(0, os.path.join(topdir, "python"))
import mach_bootstrap
mach = mach_bootstrap.bootstrap(topdir)
sys.exit(mach.run(sys.argv[1:]))

19
python/mach_bootstrap.py
View file

@ -96,12 +96,21 @@ def _activate_virtualenv(topdir):
# chain each of the requirements files into the same `pip install` call
# and it will check for conflicts.
requirements_paths = [
os.path.join(topdir, "python", "requirements.txt"),
os.path.join(topdir, "tests", "wpt", "harness", "requirements.txt"),
os.path.join(topdir, "tests", "wpt", "harness", "requirements_servo.txt"),
os.path.join("python", "requirements.txt"),
os.path.join("tests", "wpt", "harness", "requirements.txt"),
os.path.join("tests", "wpt", "harness", "requirements_servo.txt"),
]
for path in requirements_paths:
subprocess.check_call(["pip", "install", "-q", "-r", path])
for req_rel_path in requirements_paths:
req_path = os.path.join(topdir, req_rel_path)
marker_file = req_rel_path.replace(os.path.sep, '-')
marker_path = os.path.join(virtualenv_path, marker_file)
try:
if os.path.getmtime(req_path) + 10 < os.path.getmtime(marker_path):
continue
except OSError:
open(marker_path, 'w').close()
subprocess.check_call(["pip", "install", "-q", "-r", req_path])
os.utime(marker_path, None)
def bootstrap(topdir):