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Slow Linking under Linux [message #5196]

Sun, 10 September 2006 12:41

residue
Messages: 9
Registered: September 2006

Promising Member

Hi,

i'm running U++ (TheIDE) under Fedora Core 5. Linking the programm is very slow.

compile-time: 2699 msecs
linking-time: 0.59.44

is there a way to speedup linking?

gcc: 4.1.1 20060525 (Red Hat 4.1.1-1)
ld: GNU ld version 2.16.91.0.6 20060212

with best regards
peter

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Re: Slow Linking under Linux [message #5197 is a reply to message #5196]

Sun, 10 September 2006 14:08

mirek
Messages: 14291
Registered: November 2005

Ultimate Member

Well, while linking in linux is slower, one minute is quite a lot.

What are �ou linking and what is the hardware?

Possible solution is to compile in debug mode as SO (packages are compiled into shared libraries). It is however possible that in current dev version shared mode is brokem.

Mirek

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Re: Slow Linking under Linux [message #5213 is a reply to message #5197]

Sun, 10 September 2006 20:27

residue
Messages: 9
Registered: September 2006

Promising Member

I've tried SHARED Mode, but it is not really faster. It saved 6 seconds.

I'm using U++ 605 on a Intel(R) Pentium(R) 4 CPU 2.60GHz with a SATA Harddisk.

with best regards
peter

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Re: Slow Linking under Linux [message #5218 is a reply to message #5213]

Sun, 10 September 2006 21:02

mirek
Messages: 14291
Registered: November 2005

Ultimate Member

That is quite strange. I will checks my link times ASAP and report.

BTW, it is "SO" ("All shared") mode, not "SHARED" ("Use shared libs").

If you are building with debug info, I think you should be able to reduce link times by deactivating debug info for individual packages (again, in Output mode).

Another thing to check is whether your SATA drive works at full speed (possible driver problem?).

Mirek

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Re: Slow Linking under Linux [message #5219 is a reply to message #5218]

Sun, 10 September 2006 21:57

residue
Messages: 9
Registered: September 2006

Promising Member

I did the test with "SO" ("All shared").

Here some performance from the SATA drive.

writing:
100240000 Bytes (100 MB) kopiert, 0,506279 Sekunden, 198 MB/s
1002400000 Bytes (1,0 GB) kopiert, 29,8953 Sekunden, 33,5 MB/s

reading:
Timing buffered disk reads: 150 MB in 3.07 seconds = 48.94 MB/sec

I don't think there is a problem on the system. Other projects (non U++) linking within some seconds (less then 10 secs).

with best regards
peter

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Re: Slow Linking under Linux [message #5252 is a reply to message #5219]

Mon, 11 September 2006 14:08

mirek
Messages: 14291
Registered: November 2005

Ultimate Member

Well, I have just checked with my UBuntu; full rebuild of examples/UWord:

[code]
Linking...
/home/cxl/out/GCC32.Debug_full.Gui.Shared/UWord (12058847 B) linked in (0:02.42)

OK. (1:04.48)
[/quote]

I consider that quite acceptable...

gcc (GCC) 4.0.3 (Ubuntu 4.0.3-1ubuntu5)
GNU ld version 2.16.91 20060118 Debian GNU/Linux

Machine is AMD64@2.4Ghz, 1GB RAM

Mirek

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Re: Slow Linking under Linux [message #5259 is a reply to message #5252]

Mon, 11 September 2006 22:17

residue
Messages: 9
Registered: September 2006

Promising Member

Hi,

OK, it seems to be a bug within ld and debugging symbols.

http://www.mail-archive.com/bug-binutils@gnu.org/msg02052.ht ml

thanks for your support.

with best regards
peter

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Re: Slow Linking under Linux [message #5260 is a reply to message #5259]

Mon, 11 September 2006 23:30

mirek
Messages: 14291
Registered: November 2005

Ultimate Member

Great to know that it is bug of somebody else this time Wink

Mirek

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Re: Slow Linking under Linux [message #6594 is a reply to message #5260]

Sun, 19 November 2006 23:57

mirek
Messages: 14291
Registered: November 2005

Ultimate Member

Is there any solution to this?

I have made mistake upgrading to latest ubuntu and at that moment, I got a new ld with it... and slow linking.

Well, I have found that you can speedup it significantly by avoiding debug info, but that is not solution.

Mirek

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Re: Slow Linking under Linux [message #6595 is a reply to message #6594]

Mon, 20 November 2006 00:30

zsolt
Messages: 705
Registered: December 2005
Location: Budapest, Hungary

Contributor

By bugzilla, it is resolved in Linux binutils 2.17.50.0.5.
http://sourceware.org/bugzilla/show_bug.cgi?id=3111

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