Issue1986

Reproduce:

import sys
import os
import java.io
import time

java_module = sys.modules['java.io']

start = time.time()
filename = java_module.__file__
timeElapsed = round(time.time() - start, 4)
print "java.io: " + str(timeElapsed) + " s"

python_module = sys.modules['os']
start = time.time()
filename = python_module.__file__
timeElapsed = round(time.time() - start, 4)
print "os: " + str(timeElapsed) + " s"


Expected output:

__file__ operation time should be the same for both "os" and "java.io" module

Actual results differ:

java.io: 0.017 s
os: 0.0 s

The version is 2.5.3

hasattr is also slow for java modules.

This is only true for java packages.

Here is a more refined example:

import os
import time
import java.lang


def countTime(function):
    start = time.time()
    for _ in range(1, 1000):
        function()
    timeElapsed = round(time.time() - start, 5)
    return timeElapsed


timeElapsed = countTime(lambda: hasattr(java, 'some attr'))
print "hasattr(javapackage): " + str(timeElapsed) + " s"

timeElapsed = countTime(lambda: hasattr(java.lang.System, 'some attr'))
print "hasattr(javapackage.class): " + str(timeElapsed) + " s"

timeElapsed = countTime(lambda: hasattr(os, 'some attr'))
print "hasattr(python module): " + str(timeElapsed) + " s"

Different code paths. It's not nearly as slow now, with rounding removed from the original test:

$ jython27 t-file.py
java.io:  0.000999927520752
os:  0.0

I'm going to close this out - we will want to analyze performance for more than just this one example, just so we put our resources in the right place.