1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
|
#*****************************************************************************
# Copyright 2004-2008 Steve Menard
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
#*****************************************************************************
import jpype
import array
import time
import os
def generateStringData(aSize):
return ''.join(['a']*aSize)
DATA_SIZE = 5*1024*1024 # 5 MB
def runBaseline(data):
print 'Running baseline test : converting a python string->array.array->JArray(JByte). size = ', len(data)/1024.0, 'kb'
print ' Start time (no optimize) on my machine is 3.56 seconds.'
start = time.time()
#darr = array.array('b', DATA)
arr_cls = jpype.JArray(jpype.JByte)
java_arr = arr_cls(DATA)
end = time.time()
print ' test run in', (end-start), 'seconds.'
def runStringToByteBuffer(data):
print 'Running String conversion to byte buffer. size = ', len(data)/1024.0, 'kb'
start = time.time()
bb = jpype.nio.convertToDirectBuffer(data)
end = time.time()
print ' test run in', (end-start), 'seconds.'
jpype.JPackage("jpype").nio.NioReceive.receiveBuffer(bb)
def runStringToByteArray(data):
print 'Running String conversion to byte array. size = ', len(data)/1024.0, 'kb'
start = time.time()
arr_cls = jpype.JArray(jpype.JByte)
java_arr = arr_cls(data)
end = time.time()
print ' test run in', (end-start), 'seconds.'
root = os.path.abspath(os.path.dirname(__file__))
jpype.startJVM(jpype.getDefaultJVMPath(), "-ea", "-Xmx5M", "-verbose:gc", "-Djava.class.path=./classes%s%s%sclasses" % (os.pathsep, root, os.sep))
DELETED = False
class MyStr(str):
def __del__(self):
global DELETED
print 'string got deleted'
DELETED = True
def testStringMemory():
print 'with keeping the data'
data = MyStr('5' * 1024)
print data
buf = jpype.nio.convertToDirectBuffer(data)
# print buf.get()
# print buf.get()
# print buf.get()
print 'now deleting the data'
del data
# print buf.get()
# print buf.get()
# print buf.get()
# print buf.get()
print 'now deleting the buffer itself'
del buf
print 'now waiting for the string to get deleted'
while not DELETED:
time.sleep(1)
print '.',
jpype.JPackage("jpype").nio.NioReceive.allocSomeMemory()
testStringMemory()
#for i in range(1,5) :
# DATA = generateStringData(DATA_SIZE*i)
# runBaseline(DATA)
# runStringToByteBuffer(DATA)
# runStringToByteArray(DATA)
# expressly delete data to test the GC ...
#del DATA
#for i in range(3) :
# print 'GC', i
# jpype.JClass("java.lang.System").gc();
# time.sleep(15)
jpype.shutdownJVM()
|
