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Date: Wed, 23 Dec 2009 16:38:34 -0800 (PST)
From: Dan Forward <dan-nabble@forwardhome.com>
To: dev@ibatis.apache.org
Subject: Re: SoftCacheTest is Failing
In-Reply-To: <2f55db670912231521s2f2acab7o61d6f254cee33ea6@mail.gmail.com>
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References: <26905687.post@talk.nabble.com>
 <2f55db670912231521s2f2acab7o61d6f254cee33ea6@mail.gmail.com>


Subversion
------------------------------------------------------------
URL: http://svn.apache.org/repos/asf/ibatis/java/ibatis-3/trunk
Revision: 893634
Last Changed Author: cbegin
Last Changed Rev: 893558
Last Changed Date: 2009-12-23 09:01:16 -0700 (Wed, 23 Dec 2009)
------------------------------------------------------------

Java
------------------------------------------------------------
java version "1.6.0_15"
Java(TM) SE Runtime Environment (build 1.6.0_15-b03)
Java HotSpot(TM) 64-Bit Server VM (build 14.1-b02, mixed mode)
-vmargs -Xms256m -Xmx2048m -XX:MaxPermSize=3D512m
------------------------------------------------------------

OS
------------------------------------------------------------
Linux host 2.6.31-16-generic #53-Ubuntu SMP Tue Dec 8 04:02:15 UTC 2009
x86_64 GNU/Linux
(Ubuntu 9.10 64-bit)
------------------------------------------------------------


nmaves wrote:
>=20
> Dan,
>=20
> What release did you check out?  What does your env look like?  OS?
> Java version?
>=20
> I have not seen a test failing in any of the beta builds.
>=20
> Nathan
>=20
> On Wed, Dec 23, 2009 at 11:30 AM, Dan Forward
> <dan-nabble@forwardhome.com> wrote:
>>
>> I just checked out the latest code for iBATIS 3 and discovered that a
>> unit
>> test fails while building.
>>
>> ------------------------------------------------------------
>> Tests run: 4, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 5.006 se=
c
>> <<< FAILURE!
>> shouldDemonstrateObjectsBeingCollectedAsNeeded(org.apache.ibatis.cache.S=
oftCacheTest)
>> Time elapsed: 4.96 sec =C2=A0<<< FAILURE!
>> java.lang.AssertionError:
>> =C2=A0 =C2=A0 =C2=A0 =C2=A0at org.junit.Assert.fail(Assert.java:71)
>> =C2=A0 =C2=A0 =C2=A0 =C2=A0at org.junit.Assert.assertTrue(Assert.java:34=
)
>> =C2=A0 =C2=A0 =C2=A0 =C2=A0at org.junit.Assert.assertTrue(Assert.java:43=
)
>> =C2=A0 =C2=A0 =C2=A0 =C2=A0at
>> org.apache.ibatis.cache.SoftCacheTest.shouldDemonstrateObjectsBeingColle=
ctedAsNeeded(SoftCacheTest.java:21)
>> ------------------------------------------------------------
>>
>> It seems that this test attempts to fill the cache beyond the limits of
>> available memory, then checks whether the size of the cache is smaller
>> than
>> the number of items added. The cache is filled with 300,000 byte arrays
>> that
>> are 5001 bytes in size.
>>
>> I set the limit to 3,000,000 and told the loop to break as soon as the
>> size
>> of the cache was less than the number entered, and discovered that it
>> happened after 326,315 entries and approximately 6 seconds on my machine=
.
>> The test I used is below.
>>
>> @Test
>> public void shouldDemonstrateObjectsBeingCollectedAsNeeded() throws
>> Exception {
>> =C2=A0 =C2=A0 =C2=A0 =C2=A0final int N =3D 3000000;
>> =C2=A0 =C2=A0 =C2=A0 =C2=A0SoftCache cache =3D new SoftCache(new Perpetu=
alCache("default"));
>> =C2=A0 =C2=A0 =C2=A0 =C2=A0for (int i =3D 0; i < N; i++) {
>> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0byte[] array =3D new byte[5001]; //was=
te a bunch of memory
>> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0array[5000] =3D 1;
>> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0cache.putObject(i, array);
>> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Object value =3D cache.getObject(i);
>> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0if (cache.getSize() < i + 1) {
>> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0System.out=
.println("Cache exceeded with " + (i + 1) + "
>> entries.");
>> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0break;
>> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0}
>> =C2=A0 =C2=A0 =C2=A0 =C2=A0}
>> =C2=A0 =C2=A0 =C2=A0 =C2=A0assertTrue(cache.getSize() < N);
>> }
>>
>> --
>> View this message in context:
>> http://old.nabble.com/SoftCacheTest-is-Failing-tp26905687p26905687.html
>> Sent from the iBATIS - Dev mailing list archive at Nabble.com.
>>
>>
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>>
>>
>=20
> ---------------------------------------------------------------------
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>=20
>=20
>=20

--=20
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