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wafcache: add simple cache statistics collection, configurable via env

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Federico Pellegrin 2020-12-23 14:22:21 +01:00 committed by Thomas Nagy
parent 8a0850dd89
commit 54464f0a20
1 changed files with 22 additions and 0 deletions
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22
waflib/Tools/wafcache.py
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@ -31,6 +31,7 @@ The following environment variables may be set:
gsutil cp gs://mybucket/bb/bbbbb/2 build/somefile
* WAFCACHE_NO_PUSH: if set, disables pushing to the cache
* WAFCACHE_VERBOSITY: if set, displays more detailed cache operations
* WAFCACHE_STATS: if set, displays cache usage statistics on exit
File cache specific options:
Files are copied using hard links by default; if the cache is located
@ -69,6 +70,7 @@ EVICT_INTERVAL_MINUTES = int(os.environ.get('WAFCACHE_EVICT_INTERVAL_MINUTES', 3
EVICT_MAX_BYTES = int(os.environ.get('WAFCACHE_EVICT_MAX_BYTES', 10**10))
WAFCACHE_NO_PUSH = 1 if os.environ.get('WAFCACHE_NO_PUSH') else 0
WAFCACHE_VERBOSITY = 1 if os.environ.get('WAFCACHE_VERBOSITY') else 0
WAFCACHE_STATS = 1 if os.environ.get('WAFCACHE_STATS') else 0
OK = "ok"
re_waf_cmd = re.compile('(?P<src>%{SRC})|(?P<tgt>%{TGT})')
@ -93,6 +95,9 @@ def can_retrieve_cache(self):
sig = self.signature()
ssig = Utils.to_hex(self.uid() + sig)
if WAFCACHE_STATS:
self.generator.bld.cache_reqs += 1
files_to = [node.abspath() for node in self.outputs]
err = cache_command(ssig, [], files_to)
if err.startswith(OK):
@ -100,6 +105,8 @@ def can_retrieve_cache(self):
Logs.pprint('CYAN', ' Fetched %r from cache' % files_to)
else:
Logs.debug('wafcache: fetched %r from cache', files_to)
if WAFCACHE_STATS:
self.generator.bld.cache_hits += 1
else:
if WAFCACHE_VERBOSITY:
Logs.pprint('YELLOW', ' No cache entry %s' % files_to)
@ -135,6 +142,8 @@ def put_files_cache(self):
Logs.pprint('CYAN', ' Successfully uploaded %s to cache' % files_from)
else:
Logs.debug('wafcache: Successfully uploaded %r to cache', files_from)
if WAFCACHE_STATS:
self.generator.bld.cache_puts += 1
else:
if WAFCACHE_VERBOSITY:
Logs.pprint('RED', ' Error caching step results %s: %s' % (files_from, err))
@ -264,6 +273,19 @@ def build(bld):
for x in reversed(list(Task.classes.values())):
make_cached(x)
if WAFCACHE_STATS:
# Init counter for statistics and hook to print results at the end
bld.cache_reqs = bld.cache_hits = bld.cache_puts = 0
def printstats(bld):
hit_ratio = 0
if bld.cache_reqs > 0:
hit_ratio = (bld.cache_hits / bld.cache_reqs) * 100
Logs.pprint('CYAN', ' wafache stats: requests: %s, hits, %s, ratio: %.2f%%, writes %s' %
(bld.cache_reqs, bld.cache_hits, hit_ratio, bld.cache_puts) )
bld.add_post_fun(printstats)
def cache_command(sig, files_from, files_to):
"""
Create a command for cache worker processes, returns a pickled