[ python-Bugs-960995 ] test_zlib is too slow

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Bugs item #960995, was opened at 2004-05-26 10:35
Message generated for change (Comment added) made by bcannon
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Category: Python Library
Group: Python 2.4
Status: Open
Resolution: None
Priority: 3
Submitted By: Michael Hudson (mwh)
Assigned to: Nobody/Anonymous (nobody)
Summary: test_zlib is too slow

Initial Comment:
I don't know what it's doing, but I've never seen it fail and 
waiting for it has certainly wasted quite a lot of my life :-)

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>Comment By: Brett Cannon (bcannon)
Date: 2004-05-26 12:52

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A quick look at the tests Tim lists shows that each of those run the basic 
incremental decompression test 8 times, from the normal size to 2**8 
time the base size; creates a list from [1<<n for n in range(8)] size 
increments.  So we get exponential growth in data size for each test 
which uses a 1921 long string as the base.

It also compresses in 32 byte steps and then decompresses at 4 byte 
steps.  The default, though, is 256 and 64.

Perhaps we should just move these tests to something like test_zlib_long 
and have it require the overloaded largefile resource?

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Comment By: Tim Peters (tim_one)
Date: 2004-05-26 11:45

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I'm sure most of the cases in test_zlib are quite zippy (yes, 
pun intended).  Do the right thing:  determine which cases 
are the time hogs, and pare them down.  By eyeball, only 
these subtests consume enough time to notice:

test_manydecompimax
test_manydecompimaxflush
test_manydecompinc

s/_many/_some/ isn't enough on its own <wink>.

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Comment By: Raymond Hettinger (rhettinger)
Date: 2004-05-26 11:17

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I hate this slow test.  If you want to label this as
explictly called resource, regrtest -u zlib , then be my guest.

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