How is your general memory setup, i.e. amount of total RAM and how does 
it compare to the system need?

If you are short on RAM programs with a high memory demand - darktable 
is one of them - might drive your system into heavy swapping. That could 
explain the drastic slowdown.

As you wrote your data are located on a SSD. If your memory cache is on 
the same device, heavy swapping might get unnoticed - quit different to 
a mechanical HDD.

Try program free (or htop) while darktable is running and see if there 
is significant swap activity from/to cache.

Ulrich

Am 28.02.2013 10:25, schrieb Roumano:
> Hi,
>
> Nothing crazy on dmesg or /var/log/messages
>
> I was able to get a full trace (with convert) it's easier to reproduce
> than darktable as it's only one commande line & more minimal output ...
>
>
> strace -fC convert test.jpg -rotate 90 test2.jpg > /tmp/log2 2>&1
>
> But i was'nt able to do the same with gdb as nothing is crashing & don't
> have a lot of knowlgde on it ...
>
>   $ gdb
> GNU gdb (Gentoo 7.5.1 p2) 7.5.1
> Copyright (C) 2012 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later
> <http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.  Type "show
> copying"
> and "show warranty" for details.
> This GDB was configured as "x86_64-pc-linux-gnu".
> For bug reporting instructions, please see:
> <http://bugs.gentoo.org/>.
> (gdb) exec-file /usr/bin/convert
> (gdb) set logging on
> Copying output to gdb.txt.
> (gdb) run test.jpg -rotate 90 test2.jpg
> Starting program: /usr/bin/convert test.jpg -rotate 90 test2.jpg
> warning: Could not load shared library symbols for linux-vdso.so.1.
> Do you need "set solib-search-path" or "set sysroot"?
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib64/libthread_db.so.1".
> [New Thread 0x7fffe711d700 (LWP 10559)]
> [New Thread 0x7fffe691c700 (LWP 10560)]
> [New Thread 0x7fffe611b700 (LWP 10561)]
> [New Thread 0x7fffe591a700 (LWP 10562)]
> [New Thread 0x7fffe5119700 (LWP 10563)]
> [New Thread 0x7fffe4918700 (LWP 10564)]
> [New Thread 0x7fffe4117700 (LWP 10565)]
> [Thread 0x7fffe4117700 (LWP 10565) exited]
> [Thread 0x7fffe4918700 (LWP 10564) exited]
> [Thread 0x7fffe591a700 (LWP 10562) exited]
> [Thread 0x7fffe611b700 (LWP 10561) exited]
> [Thread 0x7fffe691c700 (LWP 10560) exited]
> [Thread 0x7fffe711d700 (LWP 10559) exited]
> [Thread 0x7ffff7fbd780 (LWP 10555) exited]
> [Inferior 1 (process 10555) exited normally]
> (gdb) bt
> No stack.
> (gdb) quit
>

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