[bitbake-devel] [PATCH 2/2] siggen: Split get_tashhash for performance
Richard Purdie
richard.purdie at linuxfoundation.org
Fri Dec 13 16:13:32 UTC 2019
There are two operations happening in get_taskhash, the building of the
underlying data and the calculation of the hash.
Split these into two funtions since the preparation part doesn't need
to rerun when unihash changes, only the calculation does.
This split allows sigificant performance improvements for hashequiv
in builds where many hashes are equivalent and many hashes are changing.
Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
---
lib/bb/runqueue.py | 1 +
lib/bb/siggen.py | 33 ++++++++++++++++++++++++---------
2 files changed, 25 insertions(+), 9 deletions(-)
diff --git a/lib/bb/runqueue.py b/lib/bb/runqueue.py
index bbd585306c..2829247d94 100644
--- a/lib/bb/runqueue.py
+++ b/lib/bb/runqueue.py
@@ -1185,6 +1185,7 @@ class RunQueueData:
procdep = []
for dep in self.runtaskentries[tid].depends:
procdep.append(dep)
+ bb.parse.siggen.prep_taskhash(tid, procdep, self.dataCaches[mc_from_tid(tid)])
self.runtaskentries[tid].hash = bb.parse.siggen.get_taskhash(tid, procdep, self.dataCaches[mc_from_tid(tid)])
self.runtaskentries[tid].unihash = bb.parse.siggen.get_unihash(tid)
diff --git a/lib/bb/siggen.py b/lib/bb/siggen.py
index dbf510238f..5c1301d24f 100644
--- a/lib/bb/siggen.py
+++ b/lib/bb/siggen.py
@@ -52,6 +52,9 @@ class SignatureGenerator(object):
def get_unihash(self, tid):
return self.taskhash[tid]
+ def prep_taskhash(self, tid, deps, dataCache):
+ return
+
def get_taskhash(self, tid, deps, dataCache):
self.taskhash[tid] = hashlib.sha256(tid.encode("utf-8")).hexdigest()
return self.taskhash[tid]
@@ -198,12 +201,11 @@ class SignatureGeneratorBasic(SignatureGenerator):
pass
return taint
- def get_taskhash(self, tid, deps, dataCache):
+ def prep_taskhash(self, tid, deps, dataCache):
(mc, _, task, fn) = bb.runqueue.split_tid_mcfn(tid)
- data = dataCache.basetaskhash[tid]
- self.basehash[tid] = data
+ self.basehash[tid] = dataCache.basetaskhash[tid]
self.runtaskdeps[tid] = []
self.file_checksum_values[tid] = []
recipename = dataCache.pkg_fn[fn]
@@ -216,7 +218,6 @@ class SignatureGeneratorBasic(SignatureGenerator):
continue
if dep not in self.taskhash:
bb.fatal("%s is not in taskhash, caller isn't calling in dependency order?" % dep)
- data = data + self.get_unihash(dep)
self.runtaskdeps[tid].append(dep)
if task in dataCache.file_checksums[fn]:
@@ -226,27 +227,41 @@ class SignatureGeneratorBasic(SignatureGenerator):
checksums = bb.fetch2.get_file_checksums(dataCache.file_checksums[fn][task], recipename)
for (f,cs) in checksums:
self.file_checksum_values[tid].append((f,cs))
- if cs:
- data = data + cs
taskdep = dataCache.task_deps[fn]
if 'nostamp' in taskdep and task in taskdep['nostamp']:
# Nostamp tasks need an implicit taint so that they force any dependent tasks to run
if tid in self.taints and self.taints[tid].startswith("nostamp:"):
# Don't reset taint value upon every call
- data = data + self.taints[tid][8:]
+ pass
else:
import uuid
taint = str(uuid.uuid4())
- data = data + taint
self.taints[tid] = "nostamp:" + taint
taint = self.read_taint(fn, task, dataCache.stamp[fn])
if taint:
- data = data + taint
self.taints[tid] = taint
logger.warning("%s is tainted from a forced run" % tid)
+ return
+
+ def get_taskhash(self, tid, deps, dataCache):
+
+ data = self.basehash[tid]
+ for dep in self.runtaskdeps[tid]:
+ data = data + self.get_unihash(dep)
+
+ for (f, cs) in self.file_checksum_values[tid]:
+ if cs:
+ data = data + cs
+
+ if tid in self.taints:
+ if self.taints[tid].startswith("nostamp:"):
+ data = data + self.taints[tid][8:]
+ else:
+ data = data + self.taints[tid]
+
h = hashlib.sha256(data.encode("utf-8")).hexdigest()
self.taskhash[tid] = h
#d.setVar("BB_TASKHASH_task-%s" % task, taskhash[task])
--
2.20.1
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