Author: Carl Friedrich Bolz <[email protected]>
Branch: extradoc
Changeset: r4313:be471c308a04
Date: 2012-07-19 11:04 +0200
http://bitbucket.org/pypy/extradoc/changeset/be471c308a04/
Log: start writing a script that reverse-engineers the resume data size
diff --git a/talk/vmil2012/example/rdatasize.py
b/talk/vmil2012/example/rdatasize.py
new file mode 100644
--- /dev/null
+++ b/talk/vmil2012/example/rdatasize.py
@@ -0,0 +1,66 @@
+import sys
+
+word_to_kib = 1024 / 4.
+
+def main(argv):
+ infile = argv[1]
+ seen = set()
+ seen_numbering = set()
+ # all in words
+ num_storages = 0
+ num_snapshots = 0
+ naive_num_snapshots = 0
+ size_estimate_numbering = 0
+ naive_estimate_numbering = 0
+ optimal_numbering = 0
+ size_estimate_virtuals = 0
+ num_consts = 0
+ naive_consts = 0
+ with file(infile) as f:
+ for line in f:
+ if line.startswith("Log storage"):
+ num_storages += 1
+ continue
+ if not line.startswith("\t"):
+ continue
+ line = line[1:]
+ if line.startswith("jitcode/pc"):
+ _, address = line.split(" at ")
+ if address not in seen:
+ seen.add(address)
+ num_snapshots += 1 # gc, jitcode, pc, prev
+ naive_num_snapshots += 1
+ elif line.startswith("numb"):
+ content, address = line.split(" at ")
+ size = line.count("(") / 2.0 + 3 # gc, len, prev
+ if content not in seen_numbering:
+ seen_numbering.add(content)
+ optimal_numbering += size
+ if address not in seen:
+ seen.add(address)
+ size_estimate_numbering += size
+ naive_estimate_numbering += size
+ elif line.startswith("const "):
+ address, _ = line[len("const "):].split("/")
+ if address not in seen:
+ seen.add(address)
+ num_consts += 1
+ naive_consts += 1
+ kib_snapshots = num_snapshots * 4. / word_to_kib
+ naive_kib_snapshots = naive_num_snapshots * 4. / word_to_kib
+ kib_numbering = size_estimate_numbering / word_to_kib
+ naive_kib_numbering = naive_estimate_numbering / word_to_kib
+ kib_consts = num_consts * 4 / word_to_kib
+ naive_kib_consts = naive_consts * 4 / word_to_kib
+ print "storages:", num_storages
+ print "snapshots: %sKiB vs %sKiB" % (kib_snapshots, naive_kib_snapshots)
+ print "numberings: %sKiB vs %sKiB" % (kib_numbering, naive_kib_numbering)
+ print "optimal: %s" % (optimal_numbering / word_to_kib)
+ print "consts: %sKiB vs %sKiB" % (kib_consts, naive_kib_consts)
+ print "--"
+ print "total: %sKiB vs %sKiB" % (kib_snapshots+kib_numbering+kib_consts,
+
naive_kib_snapshots+naive_kib_numbering+naive_kib_consts)
+
+
+if __name__ == '__main__':
+ main(sys.argv)
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