Hai All,<div><br></div><div>In trails of finding the execution time lapse between Python and PyPy , its proved that PyPy is slower than Python.</div><div><br></div><div>Here are the trials done ;</div><div><br></div><div><b>Step-1: Written a Python code that uses repeated os.rename()</b></div>
<div><b><br></b></div><div><b>code: (file name : rename.py)</b></div><div><div><i> #!/usr/bin/env python</i></div><div><i><br></i></div><div><i> import os</i></div><div><i> import sys</i></div>
<div><i><br></i></div><div><i> os.chdir("/opt/pypy-1.8/bin")</i></div><div><i> print "Rename count -1 (a1 -> a2)"</i></div><div><i> os.rename("a1","a2")</i></div>
<div><i> print "Rename count -2 (a2 -> a3)"</i></div><div><i> os.rename("a2","a3")</i></div><div><i> print "Rename count -3 (a3 -> a4)"</i></div>
<div><i> os.rename("a3","a4")</i></div><div><i> print "Rename count -4 (a4 -> a5)"</i></div><div><i> os.rename("a4","a5")</i></div><div><i> print "Rename count -5 (a5 -> a6)"</i></div>
<div><i> os.rename("a5","a6")</i></div><div><i> print "Rename count -6 (a6 -> a7)"</i></div><div><i> os.rename("a6","a7")</i></div><div><i> print "Rename count -7 (a7 -> a8)"</i></div>
<div><i> os.rename("a7","a8")</i></div><div><i> print "Rename count -8 (a8 -> a9)"</i></div><div><i> os.rename("a8","a9")</i></div><div><i> print "Rename count -9 (a9 -> a0)"</i></div>
<div><i> os.rename("a9","a0")</i></div><div><i> print "Rename count -10 (a0 -> B0)"</i></div><div><i> os.rename("a0","B0")</i></div><div><i><br>
</i></div><div><b>Step-2: Observed Execution time with Python 2.7</b></div><div><div style="font-weight:bold"><i><br></i></div><div style="font-weight:bold"><i> [root@Manojkiran bin]# time python rename.py </i></div>
<div><i> Rename count -1 (a1 -> a2)</i></div><div><i> Rename count -2 (a2 -> a3)</i></div><div><i> Rename count -3 (a3 -> a4)</i></div><div><i> Rename count -4 (a4 -> a5)</i></div>
<div><i> Rename count -5 (a5 -> a6)</i></div><div><i> Rename count -6 (a6 -> a7)</i></div><div><i> Rename count -7 (a7 -> a8)</i></div><div><i> Rename count -8 (a8 -> a9)</i></div>
<div><i> Rename count -9 (a9 -> a0)</i></div><div><i> Rename count -10 (a0 -> B0)</i></div><div style="font-weight:bold"><i><br></i></div><div style="font-weight:bold"><i> real<span class="Apple-tab-span" style="white-space:pre"> </span>0m0.031s</i></div>
<div style="font-weight:bold"><i> user<span class="Apple-tab-span" style="white-space:pre"> </span>0m0.021s</i></div><div style="font-weight:bold"><i> sys<span class="Apple-tab-span" style="white-space:pre"> </span>0m0.010s</i></div>
<div style="font-weight:bold"><br></div></div><div style="font-weight:bold">Step-3:<b> Observed Execution time with PyPy 1.8</b></div></div><div style="font-weight:bold"><b><br></b></div><div><div style="font-weight:bold">
[root@Manojkiran bin]# time ./pypy rename.py </div><div><i> ./pypy: /usr/local/ssl/lib/libssl.so.0.9.8: no version information available (required by ./pypy)</i></div><div><i> ./pypy: /usr/local/ssl/lib/libcrypto.so.0.9.8: no version information available (required by ./pypy)</i></div>
<div><i> Rename count -1 (a1 -> a2)</i></div><div><i> Rename count -2 (a2 -> a3)</i></div><div><i> Rename count -3 (a3 -> a4)</i></div><div><i> Rename count -4 (a4 -> a5)</i></div>
<div><i> Rename count -5 (a5 -> a6)</i></div><div><i> Rename count -6 (a6 -> a7)</i></div><div><i> Rename count -7 (a7 -> a8)</i></div><div><i> Rename count -8 (a8 -> a9)</i></div>
<div><i> Rename count -9 (a9 -> a0)</i></div><div><i> Rename count -10 (a0 -> B0)</i></div><div style="font-weight:bold"><br></div><div style="font-weight:bold"> real<span class="Apple-tab-span" style="white-space:pre"> </span>0m0.054s</div>
<div style="font-weight:bold"> user<span class="Apple-tab-span" style="white-space:pre"> </span>0m0.036s</div><div style="font-weight:bold"> sys<span class="Apple-tab-span" style="white-space:pre"> </span>0m0.016s</div>
</div><div><b><br></b></div>
<div><b>Step-4: Written a Python code that uses repeated os.link()</b></div><div><b><br></b></div><div><b>code: (file name : link.py)</b></div><div><div> <i> #!/usr/bin/env python</i></div><div><i><br></i></div>
<div><i> import os</i></div><div><i> import sys</i></div><div><i><br></i></div><div><i> os.link("/opt/pypy-1.8/bin/l0","/opt/pypy-1.8/bin/test/l0")</i></div><div><i> print "Linked count -1 (l0 -> lo)"</i></div>
<div><i> os.link("/opt/pypy-1.8/bin/l0","/opt/pypy-1.8/bin/test/l1")</i></div>
<div><i> print "Linked count -2 (l0 -> l1)"</i></div><div><i> os.link("/opt/pypy-1.8/bin/l0","/opt/pypy-1.8/bin/test/l2")</i></div><div><i> print "Linked count -3 (l0 -> l2)"</i></div>
<div><i> os.link("/opt/pypy-1.8/bin/l0","/opt/pypy-1.8/bin/test/l3")</i></div>
<div><i> print "Linked count -4 (l0 -> l3)"</i></div><div><i> os.link("/opt/pypy-1.8/bin/l0","/opt/pypy-1.8/bin/test/l4")</i></div><div><i> print "Linked count -5 (l0 -> l4)"</i></div>
<div><i> os.link("/opt/pypy-1.8/bin/l0","/opt/pypy-1.8/bin/test/l5")</i></div>
<div><i> print "Linked count -6 (l0 -> l5)"</i></div><div><i> os.link("/opt/pypy-1.8/bin/l0","/opt/pypy-1.8/bin/test/l6")</i></div><div><i> print "Linked count -7 (l0 -> l6)"</i></div>
<div><i> os.link("/opt/pypy-1.8/bin/l0","/opt/pypy-1.8/bin/test/l7")</i></div>
<div><i> print "Linked count -8 (l0 -> l7)"</i></div><div><i> os.link("/opt/pypy-1.8/bin/l0","/opt/pypy-1.8/bin/test/l8")</i></div><div><i> print "Linked count -9 (l0 -> l8)"</i></div>
<div><i> os.link("/opt/pypy-1.8/bin/l0","/opt/pypy-1.8/bin/test/l9")</i></div>
<div><i> print "Linked count -10 (l0 -> l9)"</i></div><div><br></div><div><div><div><b>Step-5: Observed Execution time with Python 2.7</b></div><div><div style="font-weight:bold"><i><br></i></div><div style="font-weight:bold">
<i> [root@Manojkiran bin]# time python link.py </i></div><div><i> Linked count -1 (l0 -> l0)</i></div><div><i> </i><i>Linked</i><i> count -2 (l0 -> l1)</i></div><div><i> </i><i>Linked</i><i> count -3 (l0 -> l2)</i></div>
<div><i> </i><i>Linked</i><i> count -4 (l0 -> l3)</i></div><div><i> </i><i>Linked</i><i> count -5 (l0 -> l4)</i></div><div><i> </i><i>Linked</i><i> count -6 (l0 -> l5)</i></div><div>
<i> </i><i>Linked</i><i> count -7 (l0 -> l6)</i></div><div><i> </i><i>Linked</i><i> count -8 (l0 -> l7)</i></div><div><i> </i><i>Linked</i><i> count -9 (l0 -> l8)</i></div><div><i> </i><i>Linked</i><i> count -10 (l0 -> l9)</i></div>
<div style="font-weight:bold"><i><br></i></div><div style="font-weight:bold"><i> real<span class="Apple-tab-span" style="white-space:pre"> </span>0m0.028s</i></div><div style="font-weight:bold"><i> user<span class="Apple-tab-span" style="white-space:pre"> </span>0m0.020s</i></div>
<div style="font-weight:bold"><i> sys<span class="Apple-tab-span" style="white-space:pre"> </span>0m0.008s</i></div><div style="font-weight:bold"><br></div></div><div style="font-weight:bold">Step-6:<b> Observed Execution time with PyPy 1.8</b></div>
</div><div style="font-weight:bold"><b><br></b></div><div><div style="font-weight:bold"> [root@Manojkiran bin]# time ./pypy link.py </div><div><i> ./pypy: /usr/local/ssl/lib/libssl.so.0.9.8: no version information available (required by ./pypy)</i></div>
<div><i> ./pypy: /usr/local/ssl/lib/libcrypto.so.0.9.8: no version information available (required by ./pypy)</i></div><div><div><i> Linked count -1 (l0 -> l0)</i></div><div><i> </i><i>Linked</i><i> count -2 (l0 -> l1)</i></div>
<div><i> </i><i>Linked</i><i> count -3 (l0 -> l2)</i></div><div><i> </i><i>Linked</i><i> count -4 (l0 -> l3)</i></div><div><i> </i><i>Linked</i><i> count -5 (l0 -> l4)</i></div><div>
<i> </i><i>Linked</i><i> count -6 (l0 -> l5)</i></div><div><i> </i><i>Linked</i><i> count -7 (l0 -> l6)</i></div><div><i> </i><i>Linked</i><i> count -8 (l0 -> l7)</i></div><div><i> </i><i>Linked</i><i> count -9 (l0 -> l8)</i></div>
<div><i> </i><i>Linked</i><i> count -10 (l0 -> l9)</i></div></div><div><i><br></i></div><div style="font-weight:bold"> real<span class="Apple-tab-span" style="white-space:pre"> </span>0m0.056s</div>
<div style="font-weight:bold"> user<span class="Apple-tab-span" style="white-space:pre"> </span>0m0.032s</div><div style="font-weight:bold"> sys<span class="Apple-tab-span" style="white-space:pre"> </span>0m0.023s</div>
</div></div><div><br></div><div>Hence in my understanding Python is better in terms of execution time when compared with PyPy.</div><div><br></div><div>Kindly suggest me if my trails are proper and why PyPy failed to achieve better speed then PyPy ?</div>
<div><br></div><div>Is this a know issue or whether we have any fix for this ?</div><div><br></div><div>Thanking you,</div><div>-- </div>Sasikanth<br><br><br><br>
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