From: Zooko O'Whielacronx <zooko@zooko.com>
Date: Thu, 9 Aug 2007 17:19:13 +0000 (-0700)
Subject: zfec: add benchmark utility
X-Git-Tag: allmydata-tahoe-0.5.0~103
X-Git-Url: https://git.rkrishnan.org/pf/content/it.html?a=commitdiff_plain;h=d1c40a7ab59bc126b25964ef583ace4249b611fb;p=tahoe-lafs%2Ftahoe-lafs.git

zfec: add benchmark utility
---

diff --git a/src/zfec/bench/bench_zfec.py b/src/zfec/bench/bench_zfec.py
new file mode 100644
index 00000000..7097d204
--- /dev/null
+++ b/src/zfec/bench/bench_zfec.py
@@ -0,0 +1,46 @@
+from zfec import filefec
+
+import os
+
+from pyutil import benchutil
+
+FNAME="benchrandom.data"
+
+def _make_new_rand_file(size):
+    open(FNAME, "wb").write(os.urandom(size))
+
+def donothing(results, reslenthing):
+    pass
+
+import sha
+hashers = [ sha.new() for i in range(100) ]
+def hashem(results, reslenthing):
+    for i, result in enumerate(results):
+        hashers[i].update(result)
+
+def _encode_file(N):
+    filefec.encode_file(open(FNAME, "rb"), donothing, 25, 100)
+   
+def _encode_file_stringy(N):
+    filefec.encode_file_stringy(open(FNAME, "rb"), donothing, 25, 100)
+   
+def _encode_file_stringy_easyfec(N):
+    filefec.encode_file_stringy_easyfec(open(FNAME, "rb"), donothing, 25, 100)
+
+def _encode_file_not_really(N):
+    filefec.encode_file_not_really(open(FNAME, "rb"), donothing, 25, 100)
+
+def _encode_file_not_really_and_hash(N):
+    filefec.encode_file_not_really_and_hash(open(FNAME, "rb"), donothing, 25, 100)
+
+def _encode_file_and_hash(N):
+    filefec.encode_file(open(FNAME, "rb"), hashem, 25, 100)
+
+def bench():
+    # for f in [_encode_file_stringy_easyfec, _encode_file_stringy, _encode_file, _encode_file_not_really,]:
+    # for f in [_encode_file,]:
+    for f in [_encode_file_not_really, _encode_file_not_really_and_hash, _encode_file, _encode_file_and_hash,]:
+        print f
+        benchutil.bench(f, initfunc=_make_new_rand_file, TOPXP=23, MAXREPS=128, MAXTIME=64)
+
+# bench()
diff --git a/src/zfec/zfec/filefec.py b/src/zfec/zfec/filefec.py
index 1419ae8e..30985a91 100644
--- a/src/zfec/zfec/filefec.py
+++ b/src/zfec/zfec/filefec.py
@@ -336,6 +336,72 @@ def encode_file(inf, cb, k, m, chunksize=4096):
         res = enc.encode(l)
         cb(res, indatasize)
 
+import sha
+def encode_file_not_really(inf, cb, k, m, chunksize=4096):
+    enc = zfec.Encoder(k, m)
+    l = tuple([ array.array('c') for i in range(k) ])
+    indatasize = k*chunksize # will be reset to shorter upon EOF
+    eof = False
+    ZEROES=array.array('c', ['\x00'])*chunksize
+    while not eof:
+        # This loop body executes once per segment.
+        i = 0
+        while (i<len(l)):
+            # This loop body executes once per chunk.
+            a = l[i]
+            del a[:]
+            try:
+                a.fromfile(inf, chunksize)
+                i += 1
+            except EOFError:
+                eof = True
+                indatasize = i*chunksize + len(a)
+                
+                # padding
+                a.fromstring("\x00" * (chunksize-len(a)))
+                i += 1
+                while (i<len(l)):
+                    a = l[i]
+                    a[:] = ZEROES
+                    i += 1
+
+        # res = enc.encode(l)
+        cb(None, None)
+
+def encode_file_not_really_and_hash(inf, cb, k, m, chunksize=4096):
+    hasher = sha.new()
+    enc = zfec.Encoder(k, m)
+    l = tuple([ array.array('c') for i in range(k) ])
+    indatasize = k*chunksize # will be reset to shorter upon EOF
+    eof = False
+    ZEROES=array.array('c', ['\x00'])*chunksize
+    while not eof:
+        # This loop body executes once per segment.
+        i = 0
+        while (i<len(l)):
+            # This loop body executes once per chunk.
+            a = l[i]
+            del a[:]
+            try:
+                a.fromfile(inf, chunksize)
+                i += 1
+            except EOFError:
+                eof = True
+                indatasize = i*chunksize + len(a)
+                
+                # padding
+                a.fromstring("\x00" * (chunksize-len(a)))
+                i += 1
+                while (i<len(l)):
+                    a = l[i]
+                    a[:] = ZEROES
+                    i += 1
+
+        # res = enc.encode(l)
+        for thing in l:
+            hasher.update(thing)
+        cb(None, None)
+
 def encode_file_stringy(inf, cb, k, m, chunksize=4096):
     """
     Read in the contents of inf, encode, and call cb with the results.