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question asked: Nov 19 '08, 7:08 a.m.
question was seen: 3,905 times
last updated: Nov 19 '08, 7:08 a.m.

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How good is the binary diff in Jazz SCM?

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Chris Melikian (66●7●2) | asked Nov 19 '08, 7:08 a.m.
We are delivering binaries as part of our build and wanted to know how good the binary diff is in Jazz SCM. For instance, if I am checking in a zip file and all that changes are modified dates in the zip file (ie the build was compiling the exact same source as the previous build), how much of the new binary needs to be saved in the checkin compared to the original?

The reason I ask is that if jar/zip files are not handled efficiently I have the (second best) option of checking in expanded JAR files which would only need to commit individual changed classes rather than the whole jar/zip file. Then at deployment time, the class folder can be re-JAR'd.

Best Regards, Chris.

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James Moody (3.3k●2●4) | answered Nov 21 '08, 3:18 p.m.
JAZZ DEVELOPER
chris.melikian wrote:
Thanks Dmitry, but it seems I'd need to get my manager to pay for the
Standard edition as reports aren't included in the Express
edition.... :-)

I'll see if I can achieve the same test using a DB2 client.


FYI, some limited reporting (in the form of some trend reports in the
dashboard only) is now available in Express in 1.0.1.

james
Jazz Reports Team Lead
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Chris Melikian (66●7●2) | answered Nov 20 '08, 9:05 a.m.
Thanks Dmitry, but it seems I'd need to get my manager to pay for the Standard edition as reports aren't included in the Express edition.... :-)

I'll see if I can achieve the same test using a DB2 client.
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Chris Melikian (66●7●2) | answered Nov 20 '08, 4:46 a.m.
Thanks Dmitry. I have the default values set in the advanced properties section. Are these sufficient for say a 1% difference in a 10MB zip file?

Best Regards, Chris.
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Dmitry Karasik (1.8k●1●1) | answered Nov 20 '08, 4:15 a.m.
JAZZ DEVELOPER
I have the default values set in the advanced properties
section. Are these sufficient for say a 1% difference in a 10MB zip
file?

Possibly, it depends on how different the files really are. You can try
using the repo size reports to see the effects of delta compression.

- Dmitry
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Dmitry Karasik (1.8k●1●1) | answered Nov 19 '08, 7:08 a.m.
JAZZ DEVELOPER
On Wed, 19 Nov 2008 12:08:01 +0000, chris.melikian wrote:

We are delivering binaries as part of our build and wanted to know how
good the binary diff is in Jazz SCM. For instance, if I am checking in a
zip file and all that changes are modified dates in the zip file (ie the
build was compiling the exact same source as the previous build), how
much of the new binary needs to be saved in the checkin compared to the
original?

If you have delta compression enabled then you should be getting very
high compression ratios if the only things that differ are the mod dates
in the zip file.

- Dmitry

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