[#IDEA-14645] Extreme slowness in compilation with Idea 7.0

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Extreme slowness in compilation with Idea 7.0

Created: 30 Aug 07 19:51 Updated: 03 Sep 07 21:39

Component/s:

Compiling Project

File Attachments:	1. 7126_glullien_29.08.2007_17.31.45.zip (3.36 Mb) 2. 7126_glullien_30.08.2007_16.13.23.zip (3.31 Mb) 3. 7126_glullien_31.08.2007_14.46.40.zip (3.18 Mb)
Environment:	« Hide Windows XP SP 2, with 2 Gb of RAM, I gave Idea 300 M. All files (sources and classes) are on a local NTFS. Show » Windows XP SP 2, with 2 Gb of RAM, I gave Idea 300 M. All files (sources and classes) are on a local NTFS.

Build:	7,126
Severity:	High

Description

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Some functionalities look great but compilations are much much slower than with Idea 6.0.
I'm pretty convinced it's spend the major time looking for timestamps and synchronizing files, and the real compilation time remains normal.
We suspected first the antivirus to introduce an overhead in the file system accesses, however disabling it does not improve noticeably the performance.

Here are two CPU snapshots.
The first one with the Symantec Antivirus enabled, the second one with
the antivirus disabled.

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Eugene Zhuravlev - 31 Aug 07 13:29

Hi Robert,
Im I right that both snapshots were taken for the first compilations after project openning? Do you experience such extream slowness on successive compilations (with antivirus disabled, of course)?

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Gurvan Lullien - 31 Aug 07 17:00

My sysadmin accepted to completely remove the anti virus.
So it's not disabled, it's really uninstalled.

However performance are a bit better by 5 to 10 %, but it's still extremely slow compared to Idea 6.
I attached another spectacular snapshot taken without any anti virus running on the machine.

And of course I did not snapshot or measure the first compilation. I already noticed with Idea 6 that the first compilation was much slower than the following ones, and this is not a big issue.

No, I'm really talking about all the intra-day compilations !

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Gibson - 31 Aug 07 17:07

I should mention that I filed this defect on behalf of my colleague glullien ...

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Eugene Zhuravlev - 31 Aug 07 17:31

Thanks. All snapshots show unusually slow access to files on disk... Will investigate.